Amorphous thermoplastic polymer with high transparency, relative density (30 ℃/4℃) 1.188-1.22. High transparency, light transmittance 90%-92%, higher than inorganic glass, and can pass through ultraviolet light up to 73.5%. Refractive index 1.49. High mechanical strength, good toughness, tensile strength 60-75mpa, impact strength 12-13kj /m, higher than inorganic glass 8-10 times. It is stretchable and directional, and the impact strength is increased by 1.5 times. It has excellent resistance to ultraviolet and atmospheric aging. The vitrification temperature is 80-100 ℃, and the decomposition temperature is >200 ℃. The service temperature is -40 ~ 80℃. Resistance to alkali, dilute acid, water soluble inorganic salts, alkanes and fats. Soluble in dichloroethane, chloroform, acetone, glacial acetic acid, dioxane, tetrahydrofuran, ethyl acetate, insoluble ethanol, ether, petroleum ether, etc. Good electrical insulation. PMMA has the advantages of light weight, low price and easy to shape.