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Epoxy Adhesive
This is a 2-part epoxy resin adhesive called Techniglue CA made by ATL Composites. It consists of a resin and hardener (or curing agent) which is mixed 2:1 respectively. The reaction is chemical based, however, the curing can be influenced by excess moisture, effecting the bond. On average this adhesive needs about 12 hours to completely harden, however this figure can be effected by the amount of hardener added, additionally, a higher surrounding temperature may speed up the chemical reaction. On average, the epoxy has a 20 minute ‘open time’ (this is the time in which it may be applied or ‘worked’). This particular product has a gel-like consistency which makes it easy to spread with little mess and wastage.
In use, it was found that the epoxy will not adhere to ‘non-polar surfaces’ such as plastics like polyethylene. This means formers and jigs can be designed to utilize plastics as ‘releasers’.