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What is the difference between Acrylic, Plexiglas and Perspex, and why use it?

The difference between Acrylic, Plexiglas and Perspex,

The main differences between Acrylic, Plexiglas and Perspex
PolyMethyl MethAcrylate (PMMA) has the common name Acrylic. Plexiglas, Perspex and Polycast are brand names for Acrylic from suppliers such as Rhom and Lucite.

Acrylic has excellent optical properties with light transmission typically around 92% and a refractive index of 1.49.  It has good abrasion resistance, is easier to process versus glass and approximately half of it’s weight. It has good chemical resistance to many common chemicals and good flexural strength.  It is also relatively widely available and cost effective versus many other engineering plastics.