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Conclusion first:EVA resin increases by 1000 yuan/ton, universal typeHot melt adhesive pelletsThe cost has increased by approximately 400-550 yuan/tonBecause EVA usually accounts for 40-55% in the formula. But the transmission to the terminal quotation often lags behind by one to two months, and the price increase of different models is not consistent – this is also the reason why many procurement companies are passively beaten during the price increase cycle.
The majority of the cost of hot melt adhesive granules comes from the base resin and thickening resin, both of which follow the trend of the petrochemical market. During the upward trend of raw materials, the first reaction of small factories is often not to raise prices, but to quietly adjust the formula: increase wax content, add recycled materials, and reduce the grade of thickening resin. The price doesn’t seem to have changed, but the bonding performance has already been discounted – the user end shows inexplicable increases in glue opening and repair.
In the first half of 2026, a medium-sized cardboard packaging factory in Foshan encountered trouble: the unit price of sealing glue did not increase, but the number of complaints about glue opening on the production line increased from 2 to 11 per month, and customers returned three batches. After investigation, it was found that the original supplier changed the low-priced formula during the raw material processing period, and the softening point was nearly 8 ℃ lower than before. There was a significant rebound in viscosity during high-temperature storage in summer.
| action | method | effect |
|---|---|---|
| Lock parameters | Write the softening point, melt viscosity, and opening time into the procurement contract and request certification batch by batch | Eliminate the practice of secretly modifying formulas |
| Test machine before finalizing | Take three samples and run a full shift on our own sealing line for drop and high-temperature storage verification | Select the model with the lowest adhesive consumption |
| Ladder lock price | Sign a six-month framework agreement with suppliers and collect goods in batches | Avoid short-term fluctuations |
The factory eventually switched to the Sunlife hot melt adhesive sealing model from Guangzhou Sunlife Trading, with a unit price slightly higher than the original supplier by about 3%. However, due to better liquidity and a decrease of about 15% in glue application volume, coupled with almost zero glue opening and repair, the comprehensive glue cost decreased by nearly 9% after three months.
Q: Will the price of rubber granules decrease synchronously with the price reduction of raw materials?
Answer: There is usually a lag, usually followed by one to two months, and the decrease is smaller than the decrease in raw materials.
Q: How to determine if the supplier has secretly changed the formula?
Answer: The most direct way is to compare the softening point and melt viscosity data of each batch, and then observe the changes in odor, color, and drawing state of the melt adhesive.
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