What determines the gel time of epoxy resin products?

Gel times of epoxy resin products depends on the reactivity of the compounds in the Part B (hardener).  Chemically they are amine hydrogens. The time the product takes to gel and then harden will be altered with change in temperature and mass of the resin/hardener mixture. 

Every 18°F increase in temperature cuts the gel time in half, and the larger the mass of product the sooner it will gel.

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