... related compound. Most often, it is used to describe a clear, glass-like plastic known as poly(methyl) methacrylate (PMMA). ... Sheet Material PMMA Type Cast Color Various colors available, clear, transparent, translucent, opaque, milky white, black, red, yellow, green,fluorescent ... the warehouse dry and well-ventilated, and from fire. Use elastic material such as rubber when processing base material.