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when was the rolling thin film oven test implemented
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Pinking in PVC extrusion can be attributed to the degradation of PVC due to excessive heat exposure during the process or the presence of metallic contaminants. PVC is sensitive to heat, and beyond its thermal stability range, it starts breaking down, producing hydrogen chloride gas, and leading to discoloration, including pinking. Additionally, the presence of certain metal ions, like iron or copper, can catalyze the degradation process, exacerbating the issue. To minimize pinking, it's crucial to control the extrusion process's temperature and use stabilizers that can protect PVC from thermal and oxidative degradation. Moreover, ensuring the raw materials are free from metallic contaminants is also key.
Storing solid phase resins requires careful consideration to maintain their integrity and reactivity for synthesis applications. Typically, these resins should be kept in a cool, dry place, away from direct sunlight and moisture, as these can affect the resin's properties. A tightly sealed container is ideal to prevent the ingress of air and moisture, which could lead to premature swelling or degradation of the resin. If the resin is sensitive to oxygen or moisture, storing it under an inert atmosphere, like nitrogen or argon, can provide additional protection. For resins with more specific storage requirements (e.g., temperature-sensitive resins), following the manufacturer's guidelines is crucial. Labeling containers with the resin type, mesh size, functional group, and any specific storage conditions can help in maintaining an organized storage system and prevent potential mix-ups. Regular inventory checks are recommended to ensure that expired or compromised resins are identified and disposed of properly.
Yes, PVC (Polyvinyl Chloride) panels are indeed waterproof, which makes them an excellent choice for areas prone to moisture, such as kitchens, bathrooms, and basements. Their inherent waterproof nature is due to the plastic resin composition of PVC, a non-porous material that repels water and resists mold and mildew. This quality not only prevents water damage but also makes PVC panels easy to clean and maintain, enhancing their durability and longevity. Additionally, PVC panels are versatile in design, offering a range of colors and patterns that can mimic textures like wood and stone, allowing for aesthetic flexibility in design choices. However, while waterproof, ensure proper installation to avoid water seeping through gaps which could potentially undermine their effectiveness.
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