1. Steady appearance quality: It is bluish white, lucid and lively, and gives people pure, fresh and exquisite feelings; It has high precision with figure size, and has the stabilization of unit length and quality; the tolerance is within 5%. 2. Well-chosen performance: It has the low diversification rate in size, and has no bleb, pock and crack after heating. 3. Good performance of concussion resistance It has the scientific formula, choiceness raw Profile, and the concussion resistance is higher than national standard in the low temperature. 4. Good fireproofing performance: As the construction Profile, the self-ignition resistance can let the clients have no worries. 5. Good light and heat stability: After the strict force aging testing, the color's variety meets the requirement of national standard. 6. High welding performance: