PEEK is a linear aromatic semi-crystalline polymer with a service temperature of 260°C. PEEK's flame retardancy has been tested in a laboratory for UL94, which includes a vertical burning rate test and a self-extinguishing time test. According to information provided by PEEK supplier Vickers, a 1.45mm sample strip without any additives has a burning rate of V-0, the highest flame retardancy level. During combustion, smoke and toxic gas emissions are extremely low. In addition, PEEK is highly resistant to chemicals, hot water and hot steam, and can be processed by traditional techniques such as injection molding, extrusion and compression molding.
PEEK is usually blended with other polymers*** and added with glass or carbon fibers, etc. It is generally used in the automotive, aircraft, pharmaceutical, electronics, and chemical industries. There are many automotive parts made with PEEK resin, such as gears and bearings. In the chemical process industry, many pumps and valves are made of PEEK, oil well equipment, semiconductors are also often seen PEEK resin. PEI is an amorphous polymer with a continuous use temperature of 180°C. It is highly resistant to hydrocarbons, halogenated solvents, water, and automotive fluids, and its glass transition temperature is 217°C. According to the data provided by PEI supplier GE, the flame burning rate of the 0.25mm sample was tested by UL 94 as V-0, and has low smoke emissions, can withstand a variety of chemicals, with high strength, modulus and high-temperature creep resistance.PEI resins are available in non-reinforced and reinforced grades. Typical fillers are carbon fibers, glass fibers and certain minerals.
In the manufacture of automotive parts, PEI can replace metal in the manufacture of dampers, sensors, air regulators, ignition system components and driveline accessories.PEI's flame retardancy and low smoke and toxic emissions also make this material used in aerospace applications, such as gas and fuel valves, steering wheels, interior decorative surfaces, food trays and so on. Electronic lighting components such as connectors and mirrors made with PEI materials are also designed to take advantage of the polymer's flame retardancy.
PEI can be processed using standard injection molding processing methods, and the resulting parts can have wall thicknesses of up to 0.25 mm. Prior to processing, PEI should be dried at 140°C to 150°C for several hours. PPS is a semi-crystalline polymer, its molecular structure is made of sulfur atoms and benzene rings connected alternately, this structure gives PPS resin higher thermal and chemical stability. the use temperature of PPS resin is 200 ℃, there is a tendency to coking during the combustion process, which is helpful to stop the spread of flames. 1.5mm thick PPS sample strips of the flame retardant level of UL 94 V-0 class. Most PPS resins are made into parts by adding glass fibers and mineral fillers.PPS has high modulus, creep resistance, and chemical resistance, which enables precision molding of parts with tight tolerances.
Utilizing PPS's flame retardancy and high thermal resistance, in the automotive industry, PPS is used to make internal engine parts, brake system parts, and electronic system parts that need to withstand high temperatures. In industrial equipment, PPS is often used in high temperature and chemical corrosive use environment. There are also some demanding electronic equipment housing using PPS to manufacture, such as PPS is often used in connectors and sockets. In addition, some office equipment, optical devices, as well as some daily necessities are often used PPS to replace metal and thermoset plastics. PPSU and PES are a class of flame-retardant materials containing elemental sulfur. In addition to the advantages of flame retardancy, PPSU has an unusual resistance to hydrolysis, high heat distortion temperature, very strong resistance to environmental stress cracking performance and good electrical insulation properties. Generally PPSU is used in medical equipment, food trays, surgical instruments, and certain parts of spacecraft.
PES has a heat deflection temperature of 204 degrees Celsius and good chemical resistance. Although not as tough as PPSU, PES is not as expensive as PPUS. Typical commercial grade PES has a flame retardant rating of UL 94 V-0 on a 0.8mm strip. PES is commonly used in automotive fuses, membranes, electrical equipment, static dissipative equipment, cookware, light reflectors, etc. The transparency of PES is an advantage in many ways. LCP is a semi-crystalline polyester resin with rigid rod-like molecules arranged in the direction of melt flow.LCP is highly rigid and still has good dimensional stability, creep resistance and low coefficient of thermal expansion at elevated temperatures. Commercial grade LCP resins have a flame retardant rating of UL94 V-0, a heat deflection temperature of 300°C, an elongation of 2.5%, and good chemical resistance and high dielectric strength.
LCP can be used in electronic connectors, fuse holders, high-temperature-resistant spools, pump parts. LCP resin is also often used in microwave ovens, stoves, cellular phones, ignition system parts, chemical equipment, medical equipment, office equipment, aircraft parts and so on.