One-part moisture-curing adhesives react with water vapor, curing from the outside in, often only about 2 to 3 mm per day. Cure slows sharply in dry or cold air and in deep, enclosed joints where moisture cannot reach. Packages must be sealed, because any moisture that gets in skins or cures the product in the tube or drum.
It's moisture cure, so in this dry winter shop the thick beads are still soft in the middle three days later.
Also heard as
- moisture-curing
Related terms
RTV
Room-temperature vulcanizing silicone, a rubbery adhesive-sealant that cures without heat, usually from air moisture.
MS polymer
A silane-modified polymer that moisture-cures into a flexible, paintable, isocyanate-free adhesive-sealant.
PUR
Polyurethane reactive hot melt, applied molten like a hot melt, then moisture-cured into a heat-resistant bond.
Polyurethane adhesive
An adhesive based on isocyanate chemistry that cures into a tough, somewhat flexible bond.