Sirgel Resin HTW-621 is an aqueous, nonionic dispersion of bisphenol A epoxy resin, which has an equivalent weight of 187 when it is liquid. Mechanically stable and with a modest viscosity, Sirgel Resin HTW-621 is normally supplied at 60% nonvolatile. There are no organic solvents found. Due to its 100% water reducibility, Sirgel Resin HTW-621 offers a broad latitude for viscosity reduction.