PRO-SET High Temp Laminating Epoxy Hardener LAM-251-HT
Description
PRO‑SET® LAM‑251‑HT High‑Temp Laminating Epoxy Hardener ONLY
PRO‑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 Features
- High‑temperature laminating epoxy hardener
- Formulated for use with LAM‑151‑HT epoxy resin
- Extra‑slow cure speed for long working times
- Excellent thermal and mechanical performance after post cure
- Supports high‑strength, high‑Tg composite laminates
- Produces strong parts with high cosmetic quality
Processing Notes
- Designed for hand lay‑up, contact molding, wet vacuum bagging, and light RTM
- Extended working time — often 8–10+ hours at room temperature depending on mass and conditions
- Typical room‑temperature gel time approximately 14–20 hours
- Elevated temperature cure required for full high‑temperature properties
Typical Applications
- High‑temperature composite molds and tooling
- Carbon fiber structural laminates
- Vacuum‑bagged composite parts
- Performance composite components
Specifications
Laminating Hardener Comparison (Verified)
| Speed | Typical Working/Open Time* | Initial Gel / “Green” | Best For | Notes |
|---|---|---|---|---|
| Extra Slow (LAM-151-HT) | ~8-10 hours | ~14-20 hours | larger parts, cooler shops | Minimize batch size to control exotherm. |
*Times are approximate; actual values vary with temperature, batch size, and layup. †Published at ~29 °C / 85 F; at ~25 °C / 77 °F expect slightly longer.
Use only with PRO-SET Laminating Resin (Z-1796).