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In the winter of 2025, a courier packaging factory in Harbin approached Guangzhou Sunlife Trading and said they were usinghot melt adhesive pelletsThe sealed express bag opened after being stored in a warehouse at minus ten degrees Celsius for a few days, causing continuous customer complaints. The boss is very anxious and says, “If rubber is produced in the south and used in the north, can’t it pass the hurdle of low temperature
The Sunlife technical team went to the site for sampling and testing: The customer originally used universal EVA hot melt adhesive particles, with a low temperature brittleness temperature of about -5 ° C. The Harbin winter warehouse tested it at -18 ° C, and the adhesive layer has been completely brittle and can be opened with light pulling.
Replace with Sunlife hot melt adhesive granules, a specialized model for low-temperature resistance, with a low-temperature brittleness temperature below -25 ° C, and a viscosity design that is moderately soft, maintaining a certain degree of flexibility at low temperatures. The gluing process remains unchanged, only the glue particles are replaced.
Actual test data: After being placed in a -20 ° C freezer for 168 hours, the peel strength of the sealed sample only decreased by 12%, far better than the 67% attenuation of the original model. After a month of bulk trial by customers, the complaint rate for glue opening decreased from 3.2% to 0.1%.
Q: How much more expensive is the price of low-temperature resistant adhesive particles compared to regular types?
A: Approximately 15-20% more expensive, but considering the cost of rework and complaints, the overall cost-effectiveness is actually higher.
Q: Will low temperature resistant models soften at high temperatures in summer?
A: I won’t. The softening point of Sunlife hot melt adhesive particles with low temperature resistance is still above 85 ° C, and there is no problem with transporting them at room temperature in summer.
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