... 1990s. SWD303 series is two components rigid polyurethane foam material with low viscosity, low density and closed cell. Based on ... an ideal alternative to wood, gypsum, plastic and other materials. With low liquid viscosity, good casting filling performance, homogeneous density, ... 12) When casting by hand, mixed it uniform with stirrer as 2000-3000r/min. with our SWD303 foam you can do mould casting ...