Fast-curing aliphatic polyamine epoxy hardeners u2014 DETA, TETA, and TEPA u2014 for ambient-temperature cure of primers, grouts, and concrete-repair mortars.
Aliphatic polyamine curatives are low-molecular-weight ethylene amines u2014 DETA,nTETA, and TEPA u2014 that crosslink liquid epoxy resin into a hard thermoset at ambientntemperature. They react fast: a DETA-cured standard epoxy can reach handlingnstrength in a few hours at 25°C with no oven. Specify them where cure speed and lowncost matter more than appearance, such as primers, epoxy grouts, anchoring compounds, andnconcrete-repair mortars.
nnThe trade-off is honest. Fast cure means short pot life (a DETA mix can gel in well undernan hour in any appreciable mass), and the high reaction exotherm limits how thick a singlenpour can be. These amines also blush: in cool, humid air they react with atmospheric carbonndioxide and water to leave a greasy carbamate film that can ruin recoat adhesion. Benchmarknthe induction time for your batch size and control the dew point during application.
nnWithin the family, reactivity climbs with amine content and molecular weight setsnflexibility. DETA gives the fastest, highest-exotherm cure; TETA is the general-purposenmiddle grade; TEPA, the heaviest, builds a slightly more flexible film. For most ambientnprimer and grout work, start with TETA, then move to DETA only if you need a faster set, ornto TEPA if the substrate flexes.
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