Water-Based PU Topcoat Test Report: VOC Compliance for Door Finishing
For door manufacturers, surface finishing is an important part of overall product quality. In addition to appearance and durability, the coating system used on a door surface can also be evaluated for its volatile organic compound (VOC) content.
A recent third-party test report for a water-based two-component polyurethane (PU) topcoat verified a VOC content of 6.7%, meeting the specified technical requirement of less than 10.0%. This test provides documented quality verification for the tested coating material.
What Was Tested?
The product tested in the report was:
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Product: Water-Based Two-Component Polyurethane Topcoat
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Sample No.: TW243303-2
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Test Category: Commissioned Testing
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Test Date: October 22–25, 2024
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Report Date: October 29, 2024
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Report No.: TW243303-2W1
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Test Organization: National GoldSun (Changzhou) Test & Certification Technology Co., Ltd.
According to the report, the submitted sample consisted of a blue, uniform liquid base component and a colorless, transparent curing agent. The specified mixing ratio was base : curing agent = 6:1 by weight.
VOC Test Result: 6.7%
The main test item covered by this report was volatile organic compounds (VOC).
| Test Item | Technical Requirement | Test Result | Conclusion |
|---|---|---|---|
| Volatile Organic Compounds (VOC) | < 10.0% | 6.7% | Qualified |
The measured VOC content was 6.7%, which is below the specified limit of 10.0%. The report therefore records the result as Qualified.
This result is particularly relevant when evaluating coating materials for applications where coating formulation and VOC content are important considerations.
VOC Test Report
What Does the 6.7% VOC Result Mean?
VOC refers to volatile organic compounds that can be released from certain coating materials. In coating evaluation, VOC content is one of the measurable characteristics used to assess the formulation.
In this test, the reported VOC result was 6.7%, compared with the specified requirement of less than 10.0%.
The result shows that the tested sample met the VOC requirement defined for this test.
It is important to note that this report verifies the VOC content of the tested coating sample. It does not, by itself, establish the complete environmental, health, durability, or performance characteristics of a finished door.
Why Water-Based PU Coatings Matter in Door Finishing
A polyurethane topcoat can be an important part of a door finishing system, providing the surface with its final coating layer and contributing to the overall finish appearance.
Water-based coating systems are increasingly considered for finishing applications because they can be formulated with water as a major carrier rather than relying entirely on conventional solvent-based systems.
For door manufacturers and buyers, coating-related documentation can therefore be useful when evaluating:
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Surface finishing materials
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Coating formulation
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VOC requirements
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Manufacturing quality control
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Material documentation for project orders
However, coating performance should always be evaluated according to the specific formulation, application process, substrate, and applicable project requirements.
Test Method and Technical Basis
The VOC test in this report was conducted according to GB/T 23986.2-2023, with the report identifying the applicable section as 11.2.
The report also specifies the testing conditions used for the gas chromatography analysis, including the chromatographic column, temperature program, detector temperature, split ratio, and carrier gas conditions.
The report states that VOC was classified according to the designated marker (DEA), using acetonitrile as the extraction solvent and a combination of CSRF and alternative calibration materials for quantification.
These details provide traceability for the reported VOC measurement rather than relying only on a general product claim.
Quality Verification Through Third-Party Testing
For international door projects, technical documentation can help buyers better understand the materials used in manufacturing.
This test report provides documented evidence for one specific characteristic of the tested coating: VOC content.
The report was issued following commissioned testing, and the sample was tested between October 22 and October 25, 2024. The final report was issued on October 29, 2024.
At Zonle Doors, material and product quality documentation can support communication with overseas buyers, contractors, distributors, and project customers who require technical information during product evaluation.
What This Report Does—and Does Not—Verify
The report should be interpreted according to its actual scope.
Verified by the Report
The report verifies that:
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The tested product was a water-based two-component polyurethane topcoat.
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The measured VOC content was 6.7%.
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The specified technical requirement was less than 10.0%.
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The tested item was classified as Qualified.
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The test was conducted according to the stated test method.
Not Verified by This Report
This particular report does not provide test results for:
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Fire resistance
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Sound insulation
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Impact resistance
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Scratch resistance
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Weather resistance
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Finished-door durability
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Formaldehyde emissions from a finished door
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Overall environmental certification
These properties require their own testing and supporting documentation where applicable.
Why Testing Documentation Matters for Door Buyers
When sourcing doors from overseas manufacturers, buyers often need more than product photos and specifications. Material information and test documentation can provide additional transparency during supplier evaluation.
For developers, contractors, distributors, and wholesalers, relevant documentation can help with:
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Material evaluation – Understanding the characteristics of coating materials used in production.
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Project documentation – Supporting technical communication during project quotation and approval.
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Supplier assessment – Providing evidence that specific materials have undergone testing.
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Quality communication – Giving buyers measurable data instead of relying only on general marketing claims.
A single test report should not be viewed as a complete assessment of a door. Instead, it should be considered together with the door's construction, materials, hardware, manufacturing process, and other applicable test reports.
Frequently Asked Questions
What is the VOC result of the tested PU topcoat?
The reported VOC content is 6.7%. The technical requirement specified in the report is less than 10.0%, and the test conclusion is Qualified.
What type of coating was tested?
The tested product was a water-based two-component polyurethane topcoat consisting of a base component and a curing agent. The report specifies a base-to-curing-agent ratio of 6:1 by weight.
What standard was used for the VOC test?
The report identifies GB/T 23986.2-2023 as the test basis for the VOC determination.
Does this report certify the environmental performance of a finished door?
No. The report specifically verifies the VOC result of the tested coating sample. It should not be interpreted as a comprehensive environmental certification of a finished door.
Can this report be used to evaluate door coating materials?
It can provide relevant information about the VOC content of the tested water-based PU topcoat. However, the suitability of a coating for a particular door, substrate, climate, or project should be evaluated based on the complete coating system and applicable project requirements.
Conclusion
The third-party test report for the water-based two-component polyurethane topcoat recorded a VOC content of 6.7%, meeting the specified requirement of less than 10.0% and receiving a Qualified conclusion.
For door sourcing, this type of material-level test documentation provides useful technical evidence and can complement other product specifications and quality reports when evaluating a door manufacturer.
Looking for a reliable door manufacturer for your next project? Contact Zonle Doors for product specifications, technical documentation, and factory support.