As the production of acrylic difficult, high cost, so the market there are many low-cost low-quality substitutes. These substitutes are also known as "acrylic", in fact, ordinary organic board or composite board (also known as sandwich board). Ordinary organic plate with ordinary plexiglass cracking pigment and casting, the surface hardness is low, easy to fade, polished with fine sand polishing effect is poor. Composite board is only a thin layer of acrylic surface, the middle is ABS plastic, the use of thermal expansion and contraction of easy delamination. True and false acrylic, from the plate section of the subtle color and polishing to identify the effect.