Mono-Epoxy Reactive Diluent (2-Ethylhexyl Glycidyl Ether)

2-Ethylhexyl Glycidyl Ether (EHGE, CAS 2461-15-6) is a mono-functional reactive diluent for epoxy resin systems. With a very low viscosity of 5-10 mPa·s at 25°C and EEW of 215-230 g/eq, EHGE is the most widely used aliphatic glycidyl ether reactive diluent for reducing the viscosity of BPA and BPF epoxy systems without introducing non-reactive solvents that would compromise film properties.

Addition of EHGE at 10-20 phr per 100g base epoxy reduces the system viscosity by 40-70%, enabling high-solids (>80%) and solventless coating formulations, no-mix floor coating systems, and wet-on-wet coating processes at ambient temperature. The mono-functional nature means each EHGE molecule acts as a chain terminator in the crosslinked network, which reduces Tg and chemical resistance proportionally to loading — therefore careful optimization is required to balance viscosity reduction against property compromise.

EHGE is miscible with all standard liquid epoxy resins (BPA, BPF) in all proportions and is compatible with amine (aliphatic, cycloaliphatic, aromatic), anhydride, and DICY curing agents. Vapor pressure is low (0.02 mPa at 20°C) and skin sensitization risk is significantly lower than phenyl glycidyl ether, making it the preferred reactive diluent from a health and safety standpoint for worker-exposed industrial coating applications.