What are the specific performances of plastic aging? How to avoid this phenomenon
Plastic products have different aging speeds and aging performance under different environments. The aging properties of plastics can usually be evaluated in accordance with GB/T15596. Commonly used: appearance change method; mechanical property change method; other performance change method. Appearance change method: a, can be visually measured. According to GB250 [16], the gray sample card for plastic products can be evaluated according to the 5th and 9th grades, which are 5, 4-5, 4, 3-4, 3, 2-3, 2, 1-2, 1. 5 It means that it is completely discolored, and the level 1 is completely discolored. More subjective. B, can be instrumental. Refer to GB/T7921 [18]. Comparative science. Mechanical properties change method: mainly to evaluate the retention rate of mechanical properties after plastic aging. The life of plastics is generally based on the time when the mechanical properties are reduced to 50%. Other performance changes include size, density, mass change, electrical property change, thermal property change, flow rate change, molecular weight change, etc. Light Weight Apvc Roof Sheet,Carbon Fiber Upvc Roof Sheet,Color Coated Temple Roof Tile,Color Corrugated Plastic Roofing Sheet ZHENHAO BUILDING MATERIALS CO.,LTD , https://www.nbpvcroof.com