MSHA requires that all components taken into mines meet flammability criteria including Interim Fire Criteria for acceptance (CR-130). This is the second grade of Nylatron to earn this distinction. Nylatron GSM, an enhanced load bearing nylon, was also approved by MSHA (Acceptance No. IC-197) and was initially used in conveyor edge rollers. Nylatron GS is strong, rigid, and has a lower coefficient of linear thermal expansion than nylon 101. Bearings made from it maintain better fit and clearances, and have less tendency to seize.
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