Harderner is always use in many application. For example harderner use on painting and on coating chemicals, as like epoxy paint adhesive. Adhesive harderner also use in some adhesives that usually difficult to hard after they apply as adhesive in certain material.
Anhydride harderner is used together with epoxy resin. After mixed together with epoxy resin actually there is a reaction between anhydride with this resin become monoester substance. The adhesive then change into cured resin that have characteristic more hard and can't change back again into the previous raw materials. For epoxy resin there is a special hardener, it is epoxy resin hardener.
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