GPPS for a colourless, odourless and tasteless and luster, transparent particles. Light, low price and low water imbibition, shading sex good, size stability, electric, products, transparent, easy processing. GPPS soluble in aromatic hydrocarbons chlorinated hydrocarbon, and aliphatic ketone and ester but in acetone can only swelling. Resistant to some mineral oil, organic acid, alkali, salt, low-carbon alcohol solution and the role. Bibulous rate is low, in damp environment can still keep its mechanical properties and dimensional stability. Electric performance is excellent, volume resistance and the surface resistance are very high, and not affected by temperature, humidity change effects and also from corona discharge influence. Resistance to radiation performance is very good also. GPPS main shortcoming is very brittle easy to crack, impact strength low, heat resistance is bad, not ability boiling water, can only at relatively low temperatures and low load use. Resistance to solar sex difference, flammable. Burns were black, and a special odor.