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what are biodegradable polymers made from
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PVC, or Polyvinyl Chloride, is a widely used thermoplastic known for its durability, chemical resistance, and versatility. Its mechanical properties vary with the type of PVC, whether rigid or flexible, and its formulation. Generally, PVC has a high tensile strength of about 50-70 MPa, making it resistant to physical impacts and pressure. Its elongation at break usually ranges from 20% to 40%, indicating moderate flexibility, especially in its plasticized forms. The material also has a good modulus of elasticity, typically around 2.4 GPa for rigid PVC, which contributes to its stiffness. Additionally, PVC exhibits a low thermal conductivity, making it an excellent insulator. The material's properties can be further modified with additives for specific applications, enhancing its UV resistance, fire resistance, or flexibility. Understanding these properties allows engineers and designers to select the right type of PVC for various applications, ensuring performance and longevity.
When dealing with melted PVC, using a color filter can be critical for safety and efficiency, depending on the application. If the purpose is to visually inspect the clarity or quality of the melt through a viewport or protective glasses, a color that reduces glare and enhances contrast without distorting the color of the PVC is ideal. Amber or yellow filters are often recommended because they can reduce blue light and improve contrast and depth perception, making it easier to observe the nuances of the melt. For photographic or technical purposes where the exact color of the melted PVC needs to be assessed, a neutral-density filter that reduces intensity without altering color might be preferable. Always ensure that any filters used can withstand the high temperatures and potentially corrosive nature of melted PVC environments.
The pressure rating of PVC (Polyvinyl Chloride) pipes varies depending on the pipe's diameter and thickness, which are categorized by schedules (SCH). For instance, common schedules like SCH 40 and SCH 80 can handle pressures ranging from 120 to 600 psi, respectively, at room temperature. However, it's vital to consult the manufacturer's specifications for precise ratings, as these can differ based on the pipe's composition and the application's requirements. It's also important to note that PVC pipes' pressure handling capacity decreases significantly with temperature increase, necessitating caution and adjustment in applications involving hot fluids or environments.
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