Amine blush

A greasy or waxy film that can form on the surface of curing epoxy when amine hardeners react with carbon dioxide and moisture in the air, particularly in cool, damp conditions. It must be removed, usually by washing with water, before overcoating or bonding, as it destroys intercoat adhesion.

Also known as: amine bloom, epoxy blush

Related terms

Epoxy resin

A thermosetting resin based on molecules containing epoxide groups, cured by reaction with a hardener such as an amine or anhydride. Valued for strong adhesion, low cure shrinkage, chemical resistance and high mechanical performance, it is widely used in structural adhesives, laminating resins, coatings and composite matrices.

Resins & adhesivesComposites & laminatesCoatings & protectionAerospaceAutomotiveConstructionMarineGreen energyIndustrial

Hardener

The component of a two-part resin or adhesive system that reacts chemically with the base resin to build the cured polymer network. Unlike a catalyst it is consumed in the reaction and must be dosed at the manufacturer's stated mix ratio; amines and anhydrides are common hardeners for epoxies.

Resins & adhesivesAerospaceAutomotiveConstructionMarineGreen energyIndustrial

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