Expansion and contraction: Taking an acrylic sheet 1000mm in length for example. In summer(40.C),It'll lengthen to 1002,In winter (-30.C),It'll shorten to 997mm. Notice for acrylic: Temperature:Acrylic will soften on heating to 100.C or above. So it should be above 100.C. Defect:Since acrylic surface hardness is similar to aluminum,so the surface protection should be noticed. If detect occurred,it should be used yellow aluminum to polish. Scratching:Since electrostatic will occur by dry cloth,if there is dust on surface,it should be washed lightly by 1% soap water by soft cloth. Heat Expansion:The index for heat expansion of acrylic is large and its extensibility is several times than that of metal,therefore it should be considered when installation. Pmma/ Perspex Sheet / Plexiglass Sheet/Arylic sheet Application (1) building insulation, door window, , telephone etc (2) lighting, advertising signs, signs, exhibition, etc (3) Medical applications: various surgical incubator medical appliances and products: bath facilities, handicraft, cosmetics, bracket and aquatic animals box, etc (4)Sculpture and signboard (5)Make kitchen and Sanitary application