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PRO‑SET® LAM‑251‑HT High‑Temp Laminating Epoxy Hardener ONLYPRO‑SET®LAM‑251‑HT is an extra‑slow, high‑temperature epoxy hardener formulated for advanced composite laminating, tooling, and mold construction applications. It is designed to be used with PRO‑SET® LAM‑151‑HT Laminating Epoxy Resin to create a high‑performance epoxy system with excellent thermal and mechanical properties.When combined with LAM‑151‑HT resin and properly post‑cured, the system can achieve a glass transition temperature (Tg) up to 350°F (176°C). The extra‑slow cure speed provides extended working time for large or complex layups while supporting consistent laminate quality and surface cosmetics.This product includes the hardener only. Must be mixed with LAM‑151‑HT resin at the specified ratio to achieve full performance properties.Key FeaturesHigh‑temperature laminating epoxy hardenerFormulated for use with LAM‑151‑HT epoxy resinExtra‑slow cure speed for long working timesExcellent thermal and mechanical performance after post cureSupports high‑strength, high‑Tg composite laminatesProduces strong parts with high cosmetic qualityProcessing NotesDesigned for hand lay‑up, contact molding, wet vacuum bagging, and light RTMExtended working time — often 8–10+ hours at room temperature depending on mass and conditionsTypical room‑temperature gel time approximately 14–20 hoursElevated temperature cure required for full high‑temperature propertiesTypical ApplicationsHigh‑temperature composite molds and toolingCarbon fiber structural laminatesVacuum‑bagged composite partsPerformance composite components