Who knows about PPL?

Reply to 1# Windows that won’t close: PPL’s new sealing material improves the service life of ball valves using polytetrafluoroethylene for sealing by 3-5 times compared to similar products. It features stable performance, reliable sealing, low friction, easy operation of the switch, high temperature resistance, wear resistance, oil resistance, corrosion resistance, and a long service life. It is widely used in industries such as petroleum, chemicals, rubber, papermaking, and pharmaceuticals. Suitable media include water, steam, heat transfer oil, and various acids; operating temperature: ≤350℃

Copolymerized phenylene engineering plastic I. Copolymerized phenylene powder Copolymerized phenylene is a new type of polymer material with many excellent properties. When polyphenyl powder is burned in a high-temperature furnace, it begins to decompose at 530 degrees; it has no melting point, and slight weight loss occurs upon prolonged heating at 450°C. It is resistant to chemical corrosion; to date, no solvent has been found that can dissolve perylene. It possesses excellent self-lubricating properties, which are superior to those of molybdenum sulfide and graphite. (1) Technical specifications: 1. Appearance: Brownish-red or dark brown powder. 2. Particle size: <200 mesh. 3. Thermal weight loss: At 400°C for 0.5 hours, ≤4%. (2) Main applications: 1. Used in the production of high-temperature resistant ion exchange resins. 2. Serves as a material for organic semiconductors and optoelectronic materials. 3. Used in the formulation of high-temperature resistant greases and lubricant additives. 4. Functions as a filler with high-temperature resistance, corrosion resistance, radiation resistance, and wear resistance. 5. Acts as a stabilizer for light and heat, as well as an inhibitor of oxidation. II. Polyphenylene engineering plastic: This product is made by using polytetrafluoroethylene as the base material, filling it with polyphenylene powder and other ingredients, then mixing them and pressing them together; it is subsequently formed through high-temperature sintering and cooling. The overall performance of this product is **1–2 times, or even more than 2 times, superior to that of seals made from polytetrafluoroethylene or other materials filled with polytetrafluoroethylene. It exhibits particularly excellent performance in terms of high-temperature resistance, with an operating temperature range of -269 to +300°C. Its applications are very wide; it is increasingly used in industries such as chemicals, printing and dyeing, compressors, and valves. It is a new type of oil-free, self-lubricating engineering plastic with outstanding comprehensive properties, making it ideal for industrial use. (1) Technical specifications: 1. Appearance: dark brown color, no cracks on the surface; no pores, delamination, or foreign inclusions after planing. 2. The specific gravity is approximately 2.2. 3. It has extremely strong resistance to chemical corrosion; strong acids, strong bases, oils, detergents, and various organic solvents have no effect on it. 4. It has excellent weather resistance; even when exposed to the atmosphere throughout the year, its surface and various properties remain unchanged. 5. It can be used at temperatures ranging from -269 to +300°C. (II) Finished products: Customized according to customer requirements. (III) Main uses: Used for braking, precision sealing rings, piston rings, guide rings, packing, gaskets, valve plates, bushings, and other oil-free lubrication products and seals. III. Polystyrene molded mixed powder: This product is manufactured using different process formulations tailored to the various usage requirements of customers. (1) Technical specifications: 1. Appearance: dark gray 2. Specific gravity: approximately 2.2 3. Fineness: ≤40 mesh

Is it polybenzene?

The applicable temperature seems to be less than 350°C, but it is superior to PTFE, which only has a limit of 150°C; its functions are basically the same as those of PTFE

What are the hardness and compressive strength of ppl???????????????