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Paper shopping bags travel through some of the harshest environments a packaging material can encounter—cold storage warehouses, unheated delivery trucks in winter, outdoor retail pick-up areas, and refrigerated food service operations. An adhesive that performs perfectly on the factory floor but becomes brittle in these downstream environments is a liability waiting to become a seam failure. TONGDE 9021CD is a low temperature resistant hot melt adhesive developed specifically for kraft paper bag sealing, with a synthetic rubber base that maintains bond integrity and flexibility well below the temperatures at which standard EVA hot melts begin to stiffen.
Most hot melt adhesives used in paper bag production are EVA-based. EVA is an excellent general-purpose base polymer, but it has a well-documented tendency to lose flexibility at low temperatures. As ambient temperature drops, EVA bonds stiffen, then become brittle, and finally crack—releasing the seam and causing bag failure. For premium retail brands whose bags are used in shopping centers, street markets, and outdoor events during winter months, this is an unacceptable risk.
This is why bag manufacturers and brand packaging engineers increasingly specify flexible hot melt for paper bag applications. Synthetic rubber hot melts maintain their elastic properties across a much wider temperature range, providing reliable seam integrity in conditions that would cause EVA adhesives to fail.
TONGDE 9021CD's synthetic rubber backbone is the key to its cold-weather performance. The polymer chain architecture of synthetic rubber provides:
These properties combine to create seams that stay closed whether a bag is carried out of a warm boutique into a cold winter street, stored in a chilled distribution center, or used in refrigerated food retail environments.
| Property | Value | Test Method |
|---|---|---|
| Base Polymer | Synthetic rubber | — |
| Appearance | Yellow block | Visual |
| Softening Point | 90±5°C | GB/T-15332 |
| Viscosity (180°C) | 2200±500 cps | HG/T-3660 |
| Operating Temperature | 150–180°C | — |
| Standard Packaging | 20 kg/box | — |
| Shelf Life | 2 years (dry, <40°C) | — |
The softening point of 90±5°C—lower than many EVA formulations—reflects the rubber base polymer's different thermal profile. This actually benefits paper bag production: lower softening point means the adhesive flows well at moderate temperatures, reducing energy consumption and minimizing heat stress on heat-sensitive coated paper and laminated bag stocks.
The best paper bag seam adhesives must bond to every substrate in the product mix. TONGDE 9021CD excels as a kraft paper bag sealing glue on:
This coverage means manufacturers can run a full day's production across different bag constructions without formula changes or tank purges.
For customers supplying bags to cold-climate markets or refrigerated retail sectors, we recommend:
For complementary paper bag closure options, explore our Hot Melt Adhesive for Air Filter Sealing and the full Filter Adhesive Range. For carton sealing on corrugated shipping cases, our Carton Sealing Adhesive provides optimized performance.
For industry guidance on paper bag manufacturing and performance testing, consult the TAPPI technical library and the Foodservice Packaging Institute.
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Main Product:
Hot Melt Adhesive,
Binding Agent,
Pressure Sensitive Adhesive,
Eva Resin,
Hot Melt Glue Gun & Machine,
Filter Adhesive
