Accelerator 399 Huntsman Catalyst / Accelerator Epoxy Resins Miscible in a wide variety of solvents Accelerator 399 Pale yellow, slightly viscous liquid Normally used in 5-15 phr range with JEFFAMINE curing agents; provides faster RT curing; useful with many amine systems; blush resistant in thin coatings. Provides rapid development of physical properties. Low volatility/vapor pressure Low color Low viscosity Low exothermic heat of reaction Low affinity for carbon dioxide High primary amine content Moderate (controlled) reactivity Miscible with other curing agents and most solvents, including water Improved flexibility Improved impact strength/toughness Improved thermal shock resistance Good electrical properties Excellent substrate wettability May be used in water-based systems Adhesives Construction: Flooring and paving Caulks/sealants Wood consolidation Accelerator. Used with amine curing agents. Provides faster RT curing and rapid development of physical properties. Offers blush resistance in thin coatings. <br> Use level: 5-15 phr.