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These adhesives are supplied as sticks of copolymers of ethene and vinyl acetate. Polyamide is used in some specialist applications. Heat is used to melt the adhesive in the ‘glue gun’ so that drops can be applied to the materials to be joined. Bonding results when the glue solidifies on cooling. They form fairly strong bonds between many surfaces, eg, cardboard, wood and plastics. Metals present a problem because they conduct the heat away from the joint too quickly unless the metal is pre-heated.
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