The use of fumed silica to transmit light and have a small particle size can make the plastic more dense. After adding silica to the polystyrene plastic film, not only its transparency, strength, and toughness are improved, but its water resistance and aging resistance are also obvious. improve. The plastic steel doors and windows produced by adding a small amount of fumed silica to ordinary plastic polyvinyl chloride have greatly improved the hardness, smoothness and anti-aging performance. Modified ordinary plastic polypropylene with fumed silica. The main technical indicators (water absorption, insulation resistance, compression residual deformation, flexural strength, etc.) all meet or exceed the performance indicators of engineering plastic nylon 6, achieving polypropylene railways. The use of accessories instead of nylon 6 has significantly reduced product costs, and its economic and social benefits are very significant.