One of the disadvantages of plastics compared to traditional materials such as metal, glass, and ceramics is that heat resistance is not high, which often limits their use in high temperature applications. In plastic materials, different types of plastics have different heat resistance; some have low heat resistance and some have higher heat. Heat-resistant plastics generally refer to a class of plastic products having a heat distortion temperature of 200 Â° C or higher.
The indicators for measuring the heat resistance of plastic products include heat distortion temperature, Martin heat resistance temperature and Vicat softening point, among which heat deformation temperature is most commonly used. The relationship between the above three heat resistance indexes of the same plastic is as follows: Vicat softening point> heat distortion temperature> Martin heat resistance temperature.
The plastics are classified into the following four types according to the heat resistance of the plastic.
1 A class of resins with low heat-resistant plastics having a heat distortion temperature of less than 100 Â°C. Specific varieties are: PE, PS, PVC, PET, PBT, ABS and PMMA.
2 A class of resins in which heat-resistant plastics have a heat distortion temperature between 100 and 200 Â°C. Specific varieties are: PP, PVF, PVDC, PSF, PPO and PC.
3 high heat-resistant plastics have a heat distortion temperature between 200 and 300 Â° C. Specific varieties are: polyphenylene sulfide (PPS) heat distortion temperature up to 240 Â° C, chlorinated polyether heat distortion temperature up to 2l0 Â° C, polyaryl sulfone (PAR) heat distortion temperature up to 280 Â° C, PEEK The heat distortion temperature can reach 230 Â°C, the thermal deformation temperature of POB can reach 260-300C, the heat distortion temperature of fusible PI is 270-280 Â°C, the heat distortion temperature of amino plastic is 240 Â°C, and the heat distortion temperature of EP can reach 230. Â°C, PF's heat distortion temperature can reach 200 Â°C.
4 super high heat resistant plastics of a type of resin with a heat distortion temperature greater than 300 Â° C. There are few types, such as: polyphenyl ester has a heat distortion temperature of 310 Â° C, polybenzimidazole (PBI) has a heat distortion temperature of 435 Â° C, and non-melting PI has a heat distortion temperature of 360 Â° C.
So what is the most high temperature resistance?
The long-term working temperature of polybenzimidazole PBI can reach 310 Â°C, and the short-term use temperature can reach 500 Â°C. Polybenzimidazole PBI is one of the most high-temperature resistant plastics at present, but the price is also the highest in plastics, and the processing is difficult. Therefore, the most high temperature resistant plastic is polybenzimidazole PBI.
Secondly, the most high-temperature resistant plastic should be polyimide PI. The long-term working temperature can reach 290 Â°C, and the short-term can reach 480 Â°C. It can work in -240 Â°C environment.
Other high temperature resistant materials
Polyamidoimide PAI (also known as TORLON) is also a thermosetting plastic with a long-term operating temperature of 250 Â° C and excellent low temperature resistance. TORLON also has excellent wear resistance and impact resistance.
Polyetheretherketone PEEK, long-term working temperature up to 160 Â° C, short-term working temperature up to 260 Â° C, enhanced grades high temperature performance is better.
Polyetherimide PEI, long-term working temperature up to 170 Â° C, short-term working temperature up to 200 Â° C.
Polyphenylene sulfide PPS has a long-term working temperature of 220 Â° C and a short-term working temperature of 260 Â° C.
Polyvinylidene fluoride PVDF has a long-term working temperature of 150 Â° C and a short-term working temperature of up to 160. It also has excellent corrosion resistance and high mechanical strength and rigidity.
Polytetrafluoroethylene PTFE has a long-term working temperature of 260 Â° C and a short-term working temperature of 280 Â° C. It has excellent corrosion resistance and is commonly known as "Plastic King". It also has a very low coefficient of friction.
The polysulfone PSU has a long-term operating temperature of 150 Â° C and a short-term working temperature of 180 Â° C. The polysulfone PSU has good electrical properties. PES performance is similar to PSU, with higher operating temperature, long-term operating temperature of 180 Â° C, short-term 220 Â° C.
Nylon 46, long-term working temperature up to 135 Â° C, with excellent toughness and good chemical resistance.
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