A: Vocal problems, like polyps, are not restricted to singers. While singers require peak performance of their voice, other voice professionals, such as teachers, lawyers, clergy, salespeople and receptionists, are also at higher risk for many vocal cord problems.
The permissible operating temperature range of nitrile rubber is â40 to +100 Â°C (â40 to +210 Â°F). For brief periods, temperatures of up to 120 Â°C (250 Â°F) can be tolerated. SKF also offers a special nitrile rubber compound with a temperature range between â55 and +110 Â°C (â65 and +230 Â°F).
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.