Introduction: The Confusion Around Laboratory Testing in Chemical Distribution

"Do you run laboratory tests on the products before delivery?"

This is one of the questions chemical distributors hear most often from quality managers, technical buyers and auditors in the metalworking industry. Behind it lies a legitimate expectation: metalworking companies certified to ISO 9001 and IATF 16949 need suppliers that guarantee traceability, complete technical documentation and conformity of the chemicals used in critical processes such as electroplating, anodizing and pickling.

The honest answer, however, often comes as a surprise: the vast majority of chemical distributors do not run independent laboratory tests. Instead, they use the transcribed COA model: a document that reproduces the results of the tests performed by the product's original manufacturer.

For many technical buyers, this immediately raises suspicion: "If the distributor doesn't test, how can I trust the quality?" The concern is understandable, but it reflects a lack of familiarity with how the industrial chemical distribution chain actually works and with the technical, commercial and practical reasons why the transcribed COA model is acceptable and also widely used and recognized in ISO 9001 and IATF 16949 audits.

This article explains, with full transparency, the difference between a transcribed COA and in-house laboratory testing, why most distributors adopt the first model, the manufacturer approval criteria that make it reliable, and how metalworking companies can qualify distributor suppliers based on transparency, traceability and commitment to quality, even when the distributor has no laboratory of its own.

By the end, you will understand why being transparent about the COA model matters more than promising tests that are never performed.

1. What a Transcribed COA Is and How It Works in Practice

1.1 Definition: Transcribed COA vs COA Based on In-House Testing

A transcribed COA is the technical document issued by a chemical distributor that faithfully reproduces the physicochemical test results obtained by the product's original manufacturer. The distributor receives the manufacturer's original COA together with the product lot and, to standardize documentation or protect its source of supply, transcribes that data onto its own form.

Mandatory elements of a transcribed COA:

  • ✅ Clear statement that the data comes from the manufacturer: "The technical specifications and test results presented in this document are transcribed from the information provided by the original manufacturer."
  • ✅ Manufacturer's lot number preserved: Full traceability back to the source
  • ✅ Parameters tested by the manufacturer: Purity, contaminants, density, pH, etc.
  • ✅ Test methods used by the manufacturer: ASTM, ABNT (Brazilian Association of Technical Standards), pharmacopeia, etc.
  • ✅ Manufacturing and expiry dates: Original manufacturer information
  • ✅ Manufacturer's original COA on file: Kept by the distributor for audits

A COA based on in-house testing is issued by distributors that have their own certified laboratory and run independent tests on every lot received, issuing a document with their own test results.

Mandatory elements of a COA based on in-house testing:

  • ✅ Accredited laboratory: ISO/IEC 17025 certification (laboratory competence)
  • ✅ Tests performed by the distributor: Internally validated methods
  • ✅ In-house technical manager: The distributor's own chemist registered with the CRQ (Brazil's Regional Council of Chemistry)
  • ✅ Calibrated equipment: Metrological traceability (RBC, Brazil's network of accredited calibration laboratories)
  • ✅ New test report number: Issued by the distributor (in addition to the manufacturer's lot)

1.2 Practical Flow: How the Transcribed COA Reaches the End Customer

Step 1: The manufacturer produces the lot and issues the original COA

  • The manufacturer produces lot L2025-3345 of Sulfuric Acid 98%
  • The manufacturer's laboratory runs the full set of tests (purity, contaminants, density, etc.)
  • It issues the original COA with all results and the methods used

Step 2: The distributor buys the lot and receives the original COA

  • The distributor buys drums from lot L2025-3345
  • It receives the manufacturer's original COA with the shipment
  • It checks the integrity of packaging, seals and labeling

Step 3: The distributor files the original COA and transcribes the data

  • The original COA is filed in the quality management system (QMS)
  • The data is transcribed onto the distributor's standard form
  • The manufacturer's lot number is preserved on the transcribed document
  • The document clearly states that the data comes from the original manufacturer

Step 4: The metalworking customer receives the product with the transcribed COA

  • Drums identified with lot L2025-3345 plus the distributor's invoice
  • The transcribed COA accompanies the delivery
  • The customer can request the manufacturer's original COA for audit purposes

Full traceability: from the customer to the distributor, and from the distributor to the manufacturer (via the lot number)

1.3 Legal Validity and Acceptance in ISO 9001 and IATF 16949 Audits

The critical question: is a transcribed COA accepted in certification audits?

Answer: Yes, provided it meets traceability and transparency criteria.

ISO 9001:2015, Clause 8.4 (Control of externally provided processes, products and services):

The standard requires organizations to ensure the conformity of externally provided products, but does not specify that distributors must run their own tests. What it does require:

  1. ✅ Defined acceptance criteria: The metalworking company must set a purchasing specification
  2. ✅ Conformity verification: The COA (transcribed or in-house) must be checked on receipt
  3. ✅ Traceability: The lot number must allow tracing back to the source
  4. ✅ Records retained: COAs must be kept for the required period

IATF 16949:2016, Traceability Requirements:

The automotive sector is stricter, but it also accepts a transcribed COA if:

  1. ✅ The manufacturer is ISO 9001 certified (at minimum)
  2. ✅ Traceability is complete (manufacturer's lot preserved)
  3. ✅ The distributor keeps the original COA on file for second-party audits
  4. ✅ The distributor is ISO 9001 certified (controlled distribution management)

Practical experience in audits:

ISO 9001 and IATF 16949 certification auditors check:

  • ❓ Does the distributor provide a lot-specific COA? (✅ Yes, transcribed or in-house)
  • ❓ Does the lot number on the packaging match the number on the COA? (✅ Yes)
  • ❓ Does the distributor maintain traceability back to the manufacturer? (✅ Yes, via the original COA on file)
  • ❓ Has the distributor approved and audited the manufacturer? (✅ Yes)
  • ❓ Is there transparency about where the data comes from? (✅ Yes, the COA is identified as transcribed)

A nonconformity would be raised if:

  • ❌ The distributor does not provide a lot-specific COA
  • ❌ There is no traceability back to the manufacturer
  • ❌ The transcribed COA does not identify the source of the data (it looks like in-house testing when it is not)
  • ❌ The distributor does not keep the original COA on file

Conclusion: The transcribed COA model is fully accepted in ISO 9001 and IATF 16949 quality management systems, provided there is transparency and complete traceability.

2. Why Most Distributors Do NOT Run Their Own Tests

2.1 Operating Cost of a Certified In-House Laboratory

Running an in-house chemical laboratory to test hundreds or thousands of lots a month is an extremely costly operation, viable only for large distributors or very high-margin products (pharmaceuticals, analytical reagents).

Required investment for a certified laboratory:

Physical infrastructure:

  • Climate-controlled room (controlled temperature and humidity)
  • Fume extraction system for acid testing
  • Granite or chemical-resistant resin benches
  • Sink with deionized water
  • Emergency shower and eyewash station
  • Reagent cabinets (flammables, acids, bases)
  • Investment: R$ 150,000 to R$ 300,000

Analytical equipment:

  • UV-Vis spectrophotometer (metal contaminant analysis): R$ 80,000 to R$ 150,000
  • Chromatograph (organic analysis): R$ 200,000 to R$ 500,000
  • Analytical balance (0.0001 g): R$ 15,000 to R$ 30,000
  • Benchtop pH meter (3-point calibration): R$ 5,000 to R$ 10,000
  • Digital density meter: R$ 8,000 to R$ 15,000
  • Automatic titrator: R$ 40,000 to R$ 80,000
  • Drying oven: R$ 10,000 to R$ 20,000
  • Total investment: R$ 358,000 to R$ 805,000

Maintenance and calibration:

  • Annual equipment calibration (RBC): R$ 30,000 to R$ 50,000/year
  • Preventive and corrective maintenance: R$ 20,000 to R$ 40,000/year
  • Testing reagents (analytical standards): R$ 15,000 to R$ 30,000/year
  • Annual cost: R$ 65,000 to R$ 120,000/year

Technical staff:

  • Chemist in charge (CRQ registered): R$ 8,000 to R$ 12,000/month
  • Laboratory technician: R$ 4,000 to R$ 6,000/month
  • Intern: R$ 1,500 to R$ 2,500/month
  • Monthly cost: R$ 13,500 to R$ 20,500/month
  • Annual cost: R$ 162,000 to R$ 246,000/year

ISO/IEC 17025 certification (laboratory accreditation):

  • Implementation consulting: R$ 50,000 to R$ 100,000
  • Certification audit: R$ 20,000 to R$ 40,000
  • Annual maintenance: R$ 15,000 to R$ 30,000/year

Total annual cost of a certified laboratory:

  • Initial investment: R$ 558,000 to R$ 1,245,000
  • Annual operating cost: R$ 242,000 to R$ 396,000/year

Feasibility analysis:

If a distributor sells 500 lots/month (6,000 lots/year):

  • Cost per test: R$ 40 to R$ 66 per lot
  • This cost would be passed on to the final price, making the products less competitive

For most industrial chemical distributors, where the commercial margin is 10% to 20%, running an in-house laboratory is not economically viable.

2.2 Traceability to the Original Manufacturer Is Preserved

A key technical argument favors the transcribed COA model: traceability back to the source is preserved.

Scenario 1: Transcribed COA (traceability preserved)

  • The metalworking company finds a contaminant in a lot of sulfuric acid
  • The transcribed COA shows the manufacturer's lot: L2025-3345
  • The metalworking company contacts the distributor and requests the original COA
  • The distributor provides the manufacturer's original COA
  • The manufacturer can be audited directly and its original production records checked
  • The manufacturer can identify the root cause (e.g., contamination in a specific tank)

Scenario 2: COA based on in-house testing (traceability compromised)

  • The distributor runs its own tests and issues a new test report number
  • The metalworking company finds a contaminant in a lot of sulfuric acid
  • The distributor's COA shows its own test report: LB-2025-0123
  • To trace back to the manufacturer, it is necessary to:
    • Identify which manufacturer lot gave rise to test report LB-2025-0123
    • Request the manufacturer's original COA (which may not have been filed)
    • Traceability gains an extra layer (more complex)

Advantage of the transcribed COA: Traceability back to the original manufacturer is direct and immediate, which makes nonconformity investigations and second-party audits easier.

2.3 Trust in Approved, Certified Manufacturers

Serious distributors base the transcribed COA model on a rigorous supplier (manufacturer) approval process. Rather than "trusting blindly", they transfer trust to manufacturers that have been audited and approved.

Typical manufacturer approval criteria:

1. Mandatory certifications:

  • ✅ ISO 9001:2015 (quality management)
  • ✅ ISO 14001:2015 (environmental management): preferred
  • ✅ ISO 45001:2018 (occupational health and safety): preferred

2. On-site audit:

  • ✅ Technical visit to the production facilities
  • ✅ Check of the in-house laboratory (equipment, calibration)
  • ✅ Review of the test methods used (ASTM, ABNT, pharmacopeia)
  • ✅ Interview with the technical manager (CRQ registration, education, experience)
  • ✅ Check of production and traceability records

3. Conformity history:

  • ✅ Review of nonconformities over the last 12 months
  • ✅ Rejected lot rate (acceptable: <1%)
  • ✅ Average response time to complaints
  • ✅ Recall capability (if needed)

4. Technical and production capacity:

  • ✅ Production scale (guaranteed continuous supply)
  • ✅ Certified raw materials
  • ✅ Controlled production process (not artisanal)
  • ✅ Lot management system (internal traceability)

Practical implication:

A distributor that rigorously approves manufacturers and keeps auditing them periodically is, in practice, validating the reliability of the manufacturer's test results. The transcribed COA therefore reflects tests from a certified and audited laboratory (the manufacturer's), not from an unknown source.

2.4 Commercial Protection of the Supply Source

A legitimate commercial reason for transcribing COAs is protecting the source of supply. Distributors invest time and resources in:

  • Finding reliable manufacturers
  • Audits and approval
  • Negotiating commercial terms
  • Building long-term relationships

If the distributor handed over the manufacturer's original COA with contact details, some customers could negotiate directly with the manufacturer, cutting the distributor out of the chain. That would undermine the distribution business model.

Transcribing the COA onto the distributor's own form makes it possible to:

  • ✅ Keep the source of supply confidential
  • ✅ Preserve traceability (the manufacturer's lot number is kept)
  • ✅ Standardize documentation (easier for customers who buy from several distributors)
  • ✅ Meet ISO 9001 and IATF 16949 traceability requirements

Note: Even with a transcribed COA, the distributor is required to provide the manufacturer's original COA if the customer requests it for an audit or a nonconformity investigation. Commercial protection does not override traceability.

3. Specification Differences Between Approved Manufacturers

3.1 The Reality of the Chemical Industry: There Is No Complete Uniformity

A critical technical point that buyers often overlook: there is no absolute standardization of the technical specifications of the same product across different certified manufacturers.

Real example: Sulfuric Acid 98%

Manufacturer A (ISO 9001 certified):

Parameter Specification Method
Purity (% w/w) 97.5 to 98.5% Titration
Iron (Fe) Max. 10 ppm Colorimetry
Chlorides (Cl) Max. 5 ppm Argentometry
Residue on evaporation Max. 0.02% Gravimetry
Arsenic (As) Max. 0.1 ppm ICP-OES

Manufacturer B (ISO 9001 certified):

Parameter Specification Method
Purity (% w/w) 98.0 to 98.5% Titration
Iron (Fe) Max. 5 ppm ICP-OES
Chlorides (Cl) Max. 3 ppm Argentometry
Residue on evaporation Max. 0.01% Gravimetry
Heavy metals (as Pb) Max. 3 ppm Colorimetry

Differences observed:

  • Purity: Manufacturer A allows 97.5% (minimum), Manufacturer B requires 98.0%
  • Iron: Manufacturer A allows 10 ppm, Manufacturer B only 5 ppm
  • Methods: Manufacturer A uses colorimetry for Fe, Manufacturer B uses ICP-OES (more precise)
  • Parameters: Manufacturer A tests arsenic, Manufacturer B tests total heavy metals

Both products are:

  • ✅ Compliant with the specification for Sulfuric Acid 98% technical grade
  • ✅ Suitable for pickling, neutralization and pH adjustment
  • ✅ ISO 9001 certified (quality management assured)
  • ✅ Traceable by lot

Implication for the distributor:

A distributor that works with several approved manufacturers may supply product from different sources depending on availability. The transcribed COA will reflect the specification of the manufacturer actually supplied.

This flexibility is normal and acceptable, provided that:

  1. ✅ All approved manufacturers have been audited and approved
  2. ✅ The products meet the customer's minimum application requirements
  3. ✅ The customer is informed of possible variations between lots from different sources (if critical)
  4. ✅ Traceability makes it possible to identify the exact source of each lot

3.2 How Distributors Manage Multiple Supply Sources

Strategy for approving multiple manufacturers:

1. Define the minimum acceptable specification:

The distributor sets a minimum internal specification that every approved manufacturer must meet.

Example: Internal specification for Sulfuric Acid 98%

  • Purity: Min. 97.5%
  • Iron: Max. 10 ppm
  • Chlorides: Max. 5 ppm
  • Residue: Max. 0.02%

2. Approve manufacturers that meet or exceed the specification:

  • Manufacturer A: Meets the minimum specification ✅
  • Manufacturer B: Exceeds the minimum specification (Fe max. 5 ppm) ✅
  • Manufacturer C: Does not meet it (Fe 15 ppm) ❌ Rejected

3. Supply product from whichever manufacturer is available, preserving traceability:

  • The customer receives a lot from Manufacturer A in January, with a transcribed COA showing Manufacturer A's specification
  • The customer receives a lot from Manufacturer B in February, with a transcribed COA showing Manufacturer B's specification
  • Both meet the minimum specification, but each COA reflects the actual specification of the manufacturer supplied

4. Communicate variations to the customer when they are critical:

If the customer specifies Fe max. 5 ppm (stricter than the general specification), the distributor:

  • ✅ Informs the customer that it will supply exclusively from Manufacturer B
  • ✅ Notes that there may be a price difference (stricter specification)
  • ✅ Keeps a record of which manufacturer was supplied in each delivery

Transparency: The customer has the right to know whether the product comes from different manufacturers over time, especially if the process is sensitive to small variations.

4. Advantages of the Transcribed COA: Traceability to the Manufacturer

4.1 Easier Nonconformity Investigations

When a nonconformity occurs (contamination, an out-of-specification parameter, a performance problem), direct traceability to the manufacturer through the transcribed COA is a major advantage.

Case study: Iron contamination in hydrochloric acid

Situation:

A metalworking company notices staining on chrome-plated parts after an activation bath with hydrochloric acid. In-house analysis reveals iron contamination above 10 ppm (specification: max. 5 ppm).

Investigation flow with a transcribed COA:

Step 1: The metalworking company reads the lot number on the drum: L2025-4567

Step 2: It checks the transcribed COA provided by the distributor:

  • Lot: L2025-4567
  • Manufacturer: [Identification kept in the distributor's internal system]
  • Fe: 4 ppm (within the manufacturer's specification)
  • Manufacturing date: February 10, 2025

Step 3: The metalworking company contacts the distributor and requests the manufacturer's original COA

Step 4: The distributor provides the manufacturer's original COA for lot L2025-4567

Step 5: The review shows:

  • The manufacturer's original COA reports Fe: 4 ppm (compliant)
  • The metalworking company retests the product in stock: Fe 12 ppm (noncompliant)
  • Conclusion: The contamination occurred after the product left the manufacturer (transport, storage or handling)

Step 6: In-depth investigation with the manufacturer:

  • The distributor contacts the manufacturer with lot number L2025-4567
  • The manufacturer checks its production records (tank, date, in-process tests)
  • The manufacturer confirms that the lot was compliant when produced (Fe 4 ppm)
  • Cause identified: The contamination occurred in a drum containing residue from a previous product (packaging cleaning failure)

Investigation time: 3 business days (full traceability)

Corrective action:

  • The distributor replaces the contaminated lot
  • The manufacturer audits its drum cleaning process
  • The metalworking company receives a new lot with a guarantee of conformity

Advantage of the transcribed COA: Direct and immediate traceability to the manufacturer's production records, enabling an effective root cause investigation.

4.2 Second-Party Audits at the Manufacturer

High-stringency customers (automotive, aerospace, pharmaceutical) frequently require second-party audits of their suppliers. With a transcribed COA, the audit can be carried out directly at the manufacturer, which is the party that actually produces and tests the product.

Scenario: An automotive metalworking company (IATF 16949) audits its supply chain

Audit flow:

1. The metalworking company requests a supplier audit:

  • The distributor Boreto & Cardoso® supplies sulfuric acid
  • The metalworking company wants to audit the laboratory that issues the COA

2. The distributor arranges an audit of the manufacturer:

  • Boreto explains that the COA is transcribed from an approved manufacturer
  • It provides the manufacturer's identity (with prior authorization)
  • It schedules an on-site audit at the manufacturer

3. The metalworking company audits the manufacturer:

  • Checks the certified laboratory (equipment, calibration, methods)
  • Reviews the production and test records for the lot supplied
  • Checks the ISO 9001 and ISO 14001 certifications
  • Confirms technical capability and quality control

4. The metalworking company approves the supply chain:

  • Manufacturer: Approved (certified laboratory, robust control)
  • Distributor Boreto: Approved (rigorous supplier approval, full traceability, ISO 9001)

Advantage: The customer can audit the party that actually produces and tests the product, without having to rely on tests by a distributor (which may not have the same technical capability as the manufacturer).

4.3 Cost-Benefit for the End Customer

If distributors tested every lot themselves, the cost would be passed on to the final price. The transcribed COA model gives the customer:

  • ✅ Full traceability (back to a certified manufacturer)
  • ✅ Reliable technical documentation (tests from an approved laboratory)
  • ✅ Competitive pricing (no cost for redundant testing)
  • ✅ ISO 9001/IATF 16949 compliance (a model accepted in audits)

Comparative cost analysis:

Item Transcribed COA COA with In-House Testing
Base product price R$ 100.00 R$ 100.00
Testing cost None R$ 15.00
Final price R$ 100.00 R$ 115.00
Traceability to manufacturer ✅ Yes ✅ Yes (more complex)
Accepted under ISO 9001 ✅ Yes ✅ Yes
Delivery time Immediate +2 days (waiting for results)

Conclusion: For most customers, a transcribed COA offers better cost-benefit without compromising traceability or compliance.

5. Boreto & Cardoso® Transparency: 53 Years of Clarity About Our Role

5.1 How We Work: Full Transparency About the Transcribed COA

Boreto & Cardoso®, with 53 years of experience supplying chemicals to the metalworking industry, has used the transcribed COA model for decades and is fully transparent about it with customers, auditors and certification bodies.

Our supply model:

1. We receive products from approved manufacturers:

  • Every manufacturer we work with is ISO 9001:2015 certified
  • We keep records of the on-site audits carried out
  • We require a lot-specific original COA for every lot received

2. We transcribe the manufacturer's COA onto a standard form:

  • The transcribed COA clearly states: "The technical specifications and test results presented in this document are transcribed from the information provided by the original manufacturer."
  • The manufacturer's lot number is preserved (full traceability)
  • The test methods used by the manufacturer are indicated

3. We file the manufacturer's original COA:

  • We keep the original COA in our quality management system (digital and paper)
  • We make the original COA available to customers on request (audits, investigations)
  • Retention period: in line with ISO 9001 and IATF 16949 requirements (at least 15 years for automotive)

4. We supply product with full traceability:

  • Packaging identified with the manufacturer's lot number
  • Transcribed COA included with the delivery
  • Invoice with traceability data (lot number plus manufacturing date)

Transparency commitment:

  • ❌ We do not promise in-house laboratory testing (we do not have a certified laboratory)
  • ✅ We guarantee that the transcribed COA reflects tests by ISO 9001 certified manufacturers
  • ✅ We provide the manufacturer's original COA for audits on request
  • ✅ We maintain full traceability of every lot supplied

5.2 Rigorous Manufacturer Approval

Our manufacturer approval process ensures that transcribed COAs reflect tests from certified, reliable laboratories:

Mandatory approval criteria:

1. Certifications:

  • ✅ ISO 9001:2015 (quality management): mandatory
  • ✅ ISO 14001:2015 (environmental management): preferred
  • ✅ Laboratory certification (ISO/IEC 17025): desirable

2. On-site audit (performed by Boreto or by contracted third parties):

  • ✅ Inspection of production facilities (process control)
  • ✅ Laboratory review (equipment, calibration, validated methods)
  • ✅ Interview with the technical manager (CRQ registration, education, experience)
  • ✅ Check of internal traceability (lots, raw materials)

3. Conformity history:

  • ✅ Review of nonconformities over the last 12 months
  • ✅ Rejected lot rate (acceptable: <1%)
  • ✅ Capacity for continuous supply (production scale)

4. Ongoing monitoring:

  • ✅ Counter-sample testing on a sampling basis (when applicable)
  • ✅ Annual supplier performance evaluation
  • ✅ Periodic re-audit (every 3 years or whenever there is a nonconformity)

Approved manufacturers are what sets us apart: We do not trust just any manufacturer "blindly". We require certifications, we audit, and we monitor continuously.

5.3 Boreto & Cardoso® ISO 9001:2015 Certification

Boreto & Cardoso® is ISO 9001:2015 certified for the supply of industrial chemicals. This certification ensures that our distribution processes are controlled, documented and audited by an independent certification body.

ISO 9001 certified processes:

1. Supplier (manufacturer) selection and approval:

  • Documented approval procedure
  • Objective approval and rejection criteria
  • Records of audits and evaluations

2. Incoming product inspection:

  • Packaging check (seals, integrity, labeling)
  • Check of the manufacturer's original COA
  • Verification of conformity with the purchasing specification

3. Storage and preservation of chemicals:

  • Areas segregated by hazard class (acids, bases, flammables)
  • Temperature and humidity control (when applicable)
  • Lot identification (visual traceability)
  • Shelf-life control (FIFO: First In, First Out)

4. Lot identification and traceability:

  • Integrated ERP system (tracking of receipt, stock and dispatch)
  • Manufacturer's lot number preserved throughout the chain
  • Record of which lot was supplied to which customer (easier recalls)

5. Product dispatch and delivery:

  • Packaging integrity check before dispatch
  • Issue of a lot-specific transcribed COA
  • Invoice with full traceability

Implication for customers:

When they choose Boreto & Cardoso® as a supplier, ISO 9001 or IATF 16949 certified metalworking companies can rely on the conformity of our distribution processes, which reduces the need for second-party audits and makes third-party audits easier to pass.

Our ISO 9001 certification is objective evidence that the transcribed COA is issued within a controlled and audited quality management system.

5.4 What We Do NOT Do: Clarity About Our Limits

A fundamental part of transparency is making clear what we do not offer, so that no unrealistic expectations are created:

What Boreto & Cardoso® does NOT do:

❌ Independent laboratory testing of products:

  • We do not have an ISO/IEC 17025 certified chemical laboratory
  • COAs are transcribed from approved, ISO 9001 certified manufacturers
  • For counter-sample testing, the customer can hire a third-party laboratory

❌ Technical consulting for process development:

  • We do not develop formulations for electroplating or anodizing baths
  • We do not provide consulting to solve problems in metalworking processes
  • For specialized consulting, we recommend specialized professionals (chemical engineers, electroplating consultants)

❌ Testing of customer effluents or products:

  • We do not test industrial wastewater for compliance with CONAMA 430 (Brazil's federal resolution on effluent discharge standards)
  • We do not test electroplating or pickling baths
  • For environmental testing, we recommend certified laboratories (INMETRO, Brazil's national metrology and accreditation institute, or ISO 17025)

❌ Custom product formulation:

  • We supply products according to the specifications of approved manufacturers
  • We do not develop tailor-made chemical formulations
  • For special products, we consult manufacturers and report back on feasibility

This clear positioning upholds professional ethics and avoids creating expectations of services we do not offer. Our value lies in supplying reliable products with complete technical documentation, full traceability and transparency about origin and specifications.

6. How Customers Can Qualify Distributors That Use a Transcribed COA

6.1 Distributor Supplier Qualification Checklist

Metalworking companies can qualify distributors that use a transcribed COA against objective criteria:

✅ Criterion 1: Transparency about the COA model

  • Does the distributor clearly state that the COA is transcribed from the manufacturer?
  • Is there an explicit statement that the data comes from the original manufacturer?
  • Does the distributor avoid giving the impression that it runs its own tests when it does not?

✅ Criterion 2: Traceability preserved

  • Does the transcribed COA show the manufacturer's lot number?
  • Can the product be traced back to its source through the lot number?
  • Does the distributor keep the manufacturer's original COA on file?

✅ Criterion 3: The distributor's ISO 9001 certification

  • Is the distributor ISO 9001:2015 certified?
  • Does the certification scope include distribution of chemicals?
  • Is the certification body accredited (e.g., INMETRO, UKAS)?

✅ Criterion 4: Manufacturer approval

  • Does the distributor have a documented procedure for supplier approval?
  • Does it require ISO 9001 certification from manufacturers?
  • Does it perform or contract on-site audits of manufacturers?

✅ Criterion 5: Availability of the original COA

  • Does the distributor provide the manufacturer's original COA on request?
  • Is the turnaround time reasonable (e.g., 3 business days)?
  • Is the original COA kept for an adequate period (at least 15 years for automotive)?

✅ Criterion 6: Conformity history

  • Is the nonconformity rate over the last 12 months low (<1%)?
  • Does the distributor respond quickly to complaints (e.g., 24 to 48 hours)?
  • Is there evidence of continuous improvement (corrective actions implemented)?

✅ Criterion 7: Traceability capability in a recall

  • Can the distributor identify every lot supplied to a given customer over a specific period?
  • Does its ERP system allow two-way tracking (from supplier to customer and back)?
  • Is there evidence of successful recalls (if applicable)?

Approval score:

  • 7 of 7 criteria met: Approved supplier (category A)
  • 5 or 6 of 7 criteria: Approved with restrictions (category B, to be monitored)
  • Fewer than 5 of 7 criteria: Rejected supplier (do not approve)

6.2 Questions to Ask the Distributor During Supplier Approval

Question 1: "Do you run your own laboratory tests on the products?"

Expected answer (transparent):

"No, we do not have a certified chemical laboratory. Our COAs are faithful transcriptions of the tests performed by the products' original manufacturers, all of them ISO 9001 certified. We keep the original COAs on file and make them available for audits on request."

Problematic answer (lack of transparency):

"Yes, every product is tested." (when in fact they only transcribe the manufacturer's COA)

Question 2: "How do you ensure the reliability of the manufacturer's test results?"

Expected answer:

"We approve manufacturers based on ISO 9001 certification, on-site audits and conformity history. We require a lot-specific COA for every lot and we continuously monitor supplier performance."

Question 3: "Can you provide the manufacturer's original COA for an audit?"

Expected answer:

"Yes, we keep the original COA on file and provide it on request within [X] business days. This preserves full traceability back to the product's source."

Question 4: "How do I identify the manufacturer's lot on the packaging?"

Expected answer:

"The manufacturer's lot number is kept in our identification. On the packaging and on the transcribed COA you will find the original lot (e.g., L2025-3345), which allows direct tracing back to the manufacturer."

Question 5: "Are you ISO 9001 certified? What is the scope?"

Expected answer:

"Yes, we are ISO 9001:2015 certified for the supply and distribution of industrial chemicals. The certificate was issued by [name of the accredited certification body]."

6.3 Counter-Sample Testing: When and How to Do It

Even with a transcribed COA from a certified manufacturer, metalworking companies can run counter-sample tests to confirm conformity:

When to run counter-sample tests:

1. Initial supplier approval:

  • Testing of the first 2 or 3 lots to confirm conformity with the specification
  • Validation of critical parameters (purity, main contaminants)

2. High-criticality products:

  • Inputs that directly affect final product quality (metal salts for electroplating)
  • Periodic testing (e.g., quarterly) of critical parameters

3. History of nonconformities:

  • If the supplier has had a previous problem, increase the frequency of counter-sample testing
  • Test 100% of lots until confidence is restored

4. Change of supplier or manufacturer:

  • If the distributor reports a change of approved manufacturer, validate the first lot from the new source

Typical parameters for counter-sample testing:

Acids (HCl, H₂SO₄, HNO₃):

  • Purity (titration): simple, low-cost test
  • Density (density meter): immediate test
  • Critical contaminants: Fe (colorimetry or ICP)

Metal salts (CuSO₄, NiSO₄, ZnCl₂):

  • Purity (EDTA titration): intermediate test
  • Metal contaminants (ICP-OES): specialized laboratory test

Alkalis (NaOH, Na₂CO₃):

  • Purity (titration): simple test
  • Carbonates (differential titration): intermediate test

Cost of counter-sample testing:

  • Simple test (purity, pH, density): R$ 50 to R$ 150 per parameter
  • Metal contaminant analysis (ICP-OES): R$ 300 to R$ 600 (multiple elements)
  • Third-party laboratory certified to ISO/IEC 17025: Recommended

Interpreting the results:

  • Compliant: The counter-sample result matches the COA (within an analytical margin of ±5%)
  • Doubtful: A difference between 5% and 10%: request a retest and an uncertainty analysis
  • Noncompliant: A difference above 10%: open a nonconformity with the distributor, request the manufacturer's original COA and consider a third-party referee analysis

7. Frequently Asked Questions (FAQ)

7.1 Does a transcribed COA have the same legal value as in-house testing?

Yes, provided it meets traceability and transparency criteria. ISO 9001 and IATF 16949 require traceability of externally provided products, but they do not specify that distributors must run their own tests. What matters is that:

  1. ✅ The distributor clearly states that the data comes from the original manufacturer
  2. ✅ The manufacturer's lot number is preserved (direct traceability)
  3. ✅ The manufacturer is ISO 9001 certified or equivalent
  4. ✅ The distributor keeps the original COA on file for audits

The transcribed COA is a widely accepted standard practice in ISO 9001 and IATF 16949 certification audits.

7.2 How can I trust a transcribed COA if the distributor doesn't test?

Trust in a transcribed COA rests on:

  1. Rigorous approval of the manufacturer by the distributor (ISO 9001 certifications, on-site audits, conformity history)
  2. Full traceability back to the manufacturer (the possibility of auditing whoever actually produces and tests the product)
  3. The distributor's ISO 9001 certification (controlled distribution management)
  4. Counter-sample testing (the customer can validate periodically)

A distributor that approves certified manufacturers is, in practice, transferring trust to approved laboratories instead of trusting blindly.

7.3 Why don't distributors run tests if they handle chemicals?

Running an ISO/IEC 17025 certified chemical laboratory is an extremely costly operation (initial investment of R$ 500,000 to R$ 1.2 million plus an annual operating cost of R$ 240,000 to R$ 400,000), viable only for large distributors.

That cost would be passed on to the final price, making products less competitive. The transcribed COA model provides full traceability with better cost-benefit for the end customer.

7.4 Can I ask the distributor for the manufacturer's original COA?

Yes, you are entitled to it. Serious distributors keep the original COA on file and provide it on request within a reasonable time (typically 3 to 5 business days).

Requesting the original COA is recommended practice for:

  • Initial approval of the distributor
  • Internal or second-party audits
  • Nonconformity investigations
  • Validation of a supplier change

If a distributor refuses to provide the original COA, that is a warning sign (possible lack of traceability).

7.5 How can I check that the distributor's manufacturer really is ISO 9001 certified?

1. Request a copy of the manufacturer's ISO 9001 certificate:

The distributor should provide a copy of the certificate (with the manufacturer's authorization) showing:

  • Manufacturer's name
  • Certification scope (production of chemicals)
  • Certification body (must be accredited)
  • Certificate validity

2. Check the certification body's database:

Accredited certification bodies maintain public databases of certified companies (e.g., the INMETRO or UKAS websites).

3. Request an on-site audit at the manufacturer:

For high-stringency customers (automotive, aerospace), the distributor can arrange a second-party audit directly at the manufacturer.

7.6 What should I do if the transcribed COA doesn't match the counter-sample test?

Recommended procedure:

1. Check the analytical margin:

Differences of up to 5% are normal (different laboratories, methods, equipment). Assess whether the difference is significant for the application.

2. Request the manufacturer's original COA:

Compare the counter-sample result with the original (non-transcribed) COA to confirm that the transcription was faithful.

3. Run a third-party referee analysis:

Send a sample to a third-party laboratory certified to ISO/IEC 17025 for independent testing.

4. Open a formal nonconformity:

If the referee analysis confirms the nonconformity, open a formal record with the distributor requiring:

  • Replacement of the noncompliant lot
  • Root cause investigation with the manufacturer
  • Corrective actions to prevent recurrence

5. Reassess the supplier's approval:

If nonconformities recur (more than 3 in 12 months), consider disqualifying the distributor.

7.7 Can distributors change the data on a transcribed COA?

No, that would be document fraud. A transcribed COA must reproduce faithfully the information on the manufacturer's original COA. Altering the data constitutes:

  • ❌ The crime of document forgery (Brazilian Penal Code, Article 297)
  • ❌ Breach of contract (supply of product that does not meet the specification)
  • ❌ Loss of ISO 9001 certification (control of records compromised)

If a customer suspects the data has been altered, it should:

  1. Request the manufacturer's original COA
  2. Compare the data (it must be identical)
  3. Run a counter-sample test
  4. If fraud is confirmed: terminate the contract, take legal action and notify the distributor's ISO 9001 certification body

Conclusion

The transcribed COA model used by most chemical distributors reflects neither a "flaw" nor a "lack of commitment to quality". It is a standard practice built on sound technical, commercial and traceability grounds:

  1. Cost-benefit: Running a certified laboratory is not economically viable for most distributors; the cost would be passed on to the customer
  2. Traceability preserved: The manufacturer's lot number allows direct tracing back to the source
  3. Trust in approved manufacturers: Serious distributors approve ISO 9001 certified manufacturers and audit them continuously
  4. Acceptance in audits: ISO 9001 and IATF 16949 accept a transcribed COA as long as there is traceability and transparency

Boreto & Cardoso®, with 53 years of experience, bases its work on full transparency about the transcribed COA model. We do not promise tests we do not perform. Our value lies in:

  • ✅ Rigorous approval of ISO 9001 certified manufacturers
  • ✅ Full traceability (original COA on file, lot number preserved)
  • ✅ ISO 9001:2015 certification (controlled and audited distribution management)
  • ✅ Transparency about our limits (we are a distributor, not a laboratory)

For metalworking companies looking for reliable suppliers, transparency about the COA model is as important a criterion as the technical documentation itself. Suppliers that hide or disguise the fact that the COA is transcribed (giving the impression of in-house testing when there is none) are more worrying than those that are honest about their role in the distribution chain.

Serious companies choose serious suppliers. And serious suppliers are open about what they do, and about what they don't.

Note to the Reader

This article is purely informative and educational, covering the differences between a transcribed COA and in-house laboratory testing in the industrial chemical distribution chain.

Boreto & Cardoso® operates exclusively as a distributor of industrial chemicals, supplying products accompanied by a Certificate of Analysis transcribed from the tests performed by approved manufacturers. We preserve full traceability by keeping the manufacturer's lot number and filing the original COA for audits.

We do not provide:

  • Independent laboratory testing (we do not have an ISO/IEC 17025 certified laboratory)
  • Technical consulting for the development of metalworking processes
  • Testing of customer effluents or products
  • Formulation of custom chemical products

What sets us apart is transparency: We are clear about our role as a distributor, we rigorously approve ISO 9001 certified manufacturers and we guarantee full traceability of every lot supplied.

For questions about product technical specifications, lot traceability or documentation:

📧 E-mail: boreto@boreto.com.br

📞 Phone numbers:

  • Head office (SP): +55 (11) 3931-1722 | +55 (11) 2366-6260
  • WhatsApp, head office: +55 (11) 99108-2229 | +55 (11) 94541-0088 | +55 (11) 91311-3528 | +55 (19) 97685-0233
  • Limeira branch: +55 (19) 99458-6331
  • WhatsApp, branch: +55 (19) 99557-1693

📍 Addresses:

  • Head office: R. Alagoas, 30 - Recanto Silvestre, Santana de Parnaíba - SP, 06530-245
  • Branch: R. Aratibá, 759 - Centro Industrial de Limeira (CIL), Limeira - SP, 13481-208

🕐 Business hours: Monday to Friday, 8:00 a.m. to 12:00 p.m. and 1:15 p.m. to 5:30 p.m.

Boreto & Cardoso®: 53 years of transparency, traceability and commitment to the metalworking industry.