Understanding the shelf life of PUR hot melt adhesive (Polyurethane Reactive Hot Melt Adhesive) is critical for ensuring optimal bonding performance. As recommended by professional hot melt adhesive manufacturers, unopened Polyurethane PUR hot melt adhesive typically has a shelf life of 9-12 months under proper storage conditions. Key factors affecting its longevity include: humidity (should be <50% RH), temperature (optimal range: 10-25°C / 50-77°F), and packaging integrity. Leading PUR hot melt adhesive manufacturers often use nitrogen-flushed or vacuum-sealed packaging to delay curing.
Expired adhesive may show signs like hardening, reduced bonding strength, or discoloration. To extend usability, implement FIFO (First-In, First-Out) inventory management and store with desiccants. This guide, backed by expert insights from top PUR hot melt adhesive manufacturers, covers storage best practices and expiration indicators to help industries maximize adhesive efficiency
2025-07-12
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