All plastic (synthetic resin) glues are formed by the reaction at elevated temperatures of the components (phenol or urea, etc. with formaldehyde, for PF or UF glues). This reaction or polymerization provides resins for moulded and extruded plastic-ware, etc., but if carefully controlled and arrested, adhesives are compounded which can be supplied either as finegrained powders or water-based thick syrups. However, the reaction cannot be halted completely, and therefore all resin glues have a limited working life only, which should always be stated on the container. To promote the ultra-rapid setting of these glues a suitable
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