... 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, ... when it is scratched in abnormal condition. Space between acrylic sheets should be left out when construction, regarding the weight, ...