The performance gap between Chinese factory-direct construction chemicals and European brands has closed substantially in the past 5 years. The documentation gap has closed more slowly. The audit checklist below is what a serious buyer should verify before committing to an OEM or bulk supply relationship with a Chinese construction chemical manufacturer.
Factory Audit Checklist
1. Certification verification (30 minutes)
- Go to the issuing body’s public register (e.g., search.cstb.fr for French A+, dibt.de for German CE, bre.co.uk for BREEAM-related). Input the certificate number from the supplier’s document. If it doesn’t appear in the register, the certificate is likely fabricated or expired.
- Request current certificates only—check expiry date. Some suppliers present expired certificates.
2. Lab test reports (check methodology)
- Lab must be ISO 17025-accredited—verify on CNAS website (cnas.org.cn) by searching the lab name
- Report date should be within 3 years for standard products
- Test method should match claimed standard (EN 1542 for pull-off, EN 11890 for VOC, etc.)
- Product name on the test report must exactly match the product name being ordered
3. Production capacity visit or video verification
- Ask for live video call of the production line for your specific product
- Verify: mixing equipment, raw material storage labels, packaging area with your label mock-up
- Request photos of raw material certificates (pigment, resin, cement base) with batch numbers
4. Sample protocol before bulk order
- Request 5–10kg sample from the production batch that will supply your order—not a pre-prepared showroom sample
- Test the sample yourself or have it tested at a local lab before confirming bulk order
- For microcement: apply to a 1m² test panel and assess colour accuracy, adhesion, and finish after sealing
5. Contract terms
- Quality clause: specify test method, acceptance criteria, and inspection right at port of departure (SGS/QIMA pre-shipment inspection)
- Replacement clause for non-conforming goods
- Labelling: confirm factory will apply your label correctly and not mix orders
→ Full guide: OEM Construction Chemical Sourcing from China
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