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There is currently no single “universal national standard” for hot melt adhesive granules, but ratherProduct standards+method standards+safety and environmental protection standardsThe three types of documents together constitute the basis for acceptance. What the purchaser needs to master the most is which standard corresponds to each of the four indicators of softening point, melt viscosity, peel strength, and harmful substance limit, and who issues the report. The following list can be directly posted on the wall of the procurement department.
| Serial number | Acceptance action | Key points of judgment |
|---|---|---|
| 1 | Check the batch number and COA accompanying the goods | Batch number corresponds one-to-one with test report |
| 2 | Visual inspection | Uniform particles, no clumping, and no obvious discoloration |
| 3 | Packaging integrity | The inner lining is undamaged and shows no signs of moisture |
| 4 | Softening point sampling test | Deviation from TDS not exceeding ± 3 ℃ |
| 5 | Test adhesion of machine samples | The fiber failure rate meets the standard and there is no smoke from drawing |
| 6 | Sample preservation and sealing | 500g of each batch of samples should be retained and stored for three months after the batch is used up |
It is recommended that each supplier establish a folder for fixed archiving: TDS technical data sheets, MSDS safety manuals, COA quality inspection reports for each batch, third-party testing reports (RoHS/VOC), business licenses and production qualifications, annual framework agreements and price attachments. Any missing item may become a deduction item during downstream customer system audits.
Guangzhou Sunlife Trading has established a complete document package for Sunlife hot melt adhesive’s book binding, packaging and sealing, and quick printing of graphics and text. Customers can directly access it during system review or bidding without the need for temporary replenishment.
Q: What if the supplier says’ meets the national standard ‘but cannot provide a report?
Answer: “Compliant with national standards” must be assigned to specific standard numbers and testing items. No report, only verbal promises are equivalent to no basis. It is recommended to request third-party testing or directly change suppliers.
Q: Does every batch need to undergo third-party testing?
Answer: No need. The common practice is to conduct a complete third-party inspection for the first cooperation, and then check the COA of the supplier for each batch. The softening point and machine adhesion should be tested by oneself, and the third-party report should be rechecked once a year.
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