You are here: Home / Products / R4388R4388 September 25, 2013 By R4388 TDS | SDS Essential R4388, a solvent-free urethane/acrylic hybrid, has been designed for excellent abrasion resistance. pH 7.7 Solids, % by Weight 39.0 Viscosity, cps @ 25°C < 300 Density, lbs/gal 8.8 % VOC 1.4 Acid Number 20 Freeze/Thaw Stability Passes 3 cycles Konig Hardness (secs) 79 Technologies:Polyurethane/Acrylic Hybrids (Solvent-Free)