Plastic pipe caps, crafted from plastic as the primary material, are a type of pipe fitting. Plastic is a class of thermoplastic polymer materials with moldability. It, along with synthetic rubber and synthetic fibers, constitutes the three indispensable synthetic materials in modern daily life. Specifically, plastics are mainly composed of synthetic resins, which can be molded into various shapes under conditions of temperature and pressure, while maintaining their shape at room temperature.

Key Properties of Plastic: 1. Lightweight: Plastic is a relatively light material, with a relative density ranging from 0.90 to 2.2. 2. Excellent Chemical Stability: Most plastics have good resistance to corrosion from acids, alkalis, and other chemicals. 3. Outstanding Electrical Insulation: Ordinary plastics are poor conductors of electricity, with high surface and volume resistances, which can reach from 10^9 to 10^18 ohms. 4. Poor Heat Conductor: Plastic is also effective in sound absorption and vibration reduction.