List of National Standards and Testing Criteria for Hot Melt Adhesive Particles: Just follow the inspection for procurement acceptance

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.

1、 Performance indicators and corresponding method standards

• Softening point (global method)GB/T 4507 or ASTM E28. The report must indicate the testing method, and the readings of the global method and the global softening point meter cannot be directly compared with other methods.
• Melt viscosityGB/T 2794 or ASTM D3236 should indicate the testing temperature (such as 160 ℃, 180 ℃), and it is meaningless to talk about viscosity without temperature.
• peel strengthGB/T 2790 (180 °), GB/T 2791 (T-type), GB/T 2792 (90 °). Simultaneously record the fiber failure rate during paper bonding.
• thermal stabilityObservation of discoloration, skinning, and viscosity change rate after 168 hours of constant temperature aging is commonly used, which belongs to the scope of enterprise standards and needs to be specified in the agreement.
• Opening hours and curing timeThere is no mandatory national standard, and the testing conditions and values are generally provided by the supplier in the Technical Data Sheet (TDS).

2、 Basis for safety and environmental protection

• GB 33372 Limits for volatile organic compounds in adhesivesHot melt products usually have extremely low VOC, but reports can effectively respond to downstream customer audits.
• RoHS Directive (2011/65/EU and its revisions)Export orders and electronic packaging are often required to test for lead, cadmium, mercury, hexavalent chromium, and phthalates.
• Compliance of food contact materialsIf used for indirect contact with food packaging, relevant statements or third-party evaluations related to the GB 4806 series must be provided.
• MSDS/SDS Safety Technical ManualAccording to GB/T 16483, transportation, warehousing, and emergency response are all necessary documents.
• REACH SVHC DeclarationCommon requirements for export orders of books, magazines, and gift boxes to the European Union.

3、 List of Actions for Arrival Acceptance

4、 File archiving checklist

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.

Frequently Asked Questions

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.