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Machine grade polycarbonate (PC) is a transparent amorphous thermoplastic which offers very high impact strength and high modulus of elasticity. The material has a 290Â°F (145Â°C) heat deflection temperature at 264 psi, absorbs very little moisture and resists acidic solutions. These properties, in addition to good electrical characteristics, make machine grade polycarbonate stock shapes an excellent choice for electrical/electronic applications.
The bearings are heat stabilized up to 120 Â°C (250 Â°F). Steel or brass cages can be used at the same operating temperatures as the bearing rings and balls. For temperature limits of polymer cages, refer to Cage materials. The permissible operating temperature for NBR seals is â40 to +100 Â°C (â40 to +210 Â°F). Temperatures up to 120 Â°C (250 Â°F) can be tolerated for brief periods. Temperature limits for the greases used in sealed SKF self-aligning ball bearings are provided in table 1.