Epoxy resin glues and hardeners (Araldite, etc.) are in the form of stiff creams which are intimately mixed together prior to use; thus there is very little initial solvent present, and no volatile matter is evolved during the reaction. These glues have wide applications in bonding notoriously difficult surfaces, metal, glass, china, plastics, wood, rubber, etc., and with a suitable filler can be used as a waterproof mastic for bonding plastic working-tops to steel and porcelain sinks, etc. Polyvinyl acetate emulsion glues are white creams which form transparent glue-lines and set by evaporation of the water content. They are ready-mixed general-purpose assembly glues, not water-resistant but with considerable tensile strength and durability, and a curious affinity for brick, cement, glazed tiles, paint, etc. They have a tendency to creep from open joints in humid conditions, and are therefore not suitable for tropical conditions. Cellulose (vegetable) glues with added synthetic resins (quick-setting cements, balsa cement, etc.) have practical uses in the workshop, but not for general assembly-work.
So-called impact glues are synthetic or natural rubber latex glues in suitable solvents, and are widely used for bonding decorative, laminated plastics on site where cramping/ clamping or pressing facilities are not available; the natural resilience of the rubber gives the necessary amount of flexibility between the inert plastic and the creep or movement of the wood. They are sometimes used for assembly-work and bonding small strips or inlays of veneers, but this is not their rightful function, and must be regarded as an expedient only, not suitable for permanent work.
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