... and should include time for the part to fall free of the mold. Once the part is ejected, ... valves Acrylic PMMA Diakon, Oroglas, Lucite, Plexiglas Rigid, brittle, scratch resistant, transparent, optical clarity, low/medium cost Display stands, knobs, ... , Appryl, Escorene Lightweight, heat resistance, high chemical resistance, scratch resistance, natural waxy appearance, tough and stiff, low cost. ...