608.00/01 PUR adhesive: PUR hot melt has a well-defined life span during which curing takes place. It is important that the 608.00/01 adhesive be completely [...] open more than one can at a time or stage the open adhesive cartridges at the work place. When the adhesive is exposed to humidity for an extended period of time [...] layer of the adhesive. This will produce an invisible fine skin in the exposed areas which cannot be melted again. Compromised PUR hot melt adhesive will lead
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