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A certain food packaging factory received a batch of returns: 2000 sealed paper boxes experienced seal delamination and leakage within 48 hours after being filled with edible oil. The factory director immediately suspected thathot melt adhesive pelletsQuality issue, but the problem persists even after changing to another batch of rubber particles. It was not until a systematic oil resistance test was conducted that the root cause was discovered.
The oil resistance of hot melt adhesive particles refers to the ability of the adhesive layer to maintain its bonding strength without weakening after coming into contact with oily substances. Not all hot melt adhesive particles are oil resistant – the strength of standard EVA type can decrease by more than 40% when in contact with edible oil, while the oil resistant modified type can decrease by less than 10%.
The factory conducted comparative tests in accordance with ASTM D4287 standard:
| recipe | Original strength | After soaking for 48 hours | attenuation rate |
|---|---|---|---|
| Standard EVA type | 4.0N/cm | 2.3N/cm | 43% |
| Oil resistant modified type | 3.8N/cm | 3.5N/cm | 8% |
The results are clear at a glance: the standard EVA type decays by 43% in edible oil within 48 hours, far exceeding the packaging safety threshold (usually requiring attenuation)<15%）。该厂换用森莱热熔胶粒的耐油改性型后，退货问题彻底解决。
Q: How do I know if my application requires an oil resistant type?
A: As long as the bonding surface comes into contact with oily substances (such as cooking oil, engine oil, skincare oil, etc.), an oil resistance test must be conducted. For scenarios where there is no contact with grease, the standard model is sufficient.
Q: What is the price difference between oil resistant and standard models?
A: The oil resistant modified type is usually priced 15-25% higher due to its complex formula. But the loss of returning once is much greater than the price difference, and the food packaging industry recommends directly using oil resistant types.
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