... 2.good heat resistance 3. flame resistance . RX-5white cast nylon rodI. PA DescriptionPA is recognized as the most widely ... , very tough, even at low temperatures, and high hardness in the surface, toughness, mechanical lower shock, and abrasion resistance. ... acid or touch overmuch acid.3. Poor lightfastness, poor endurance in pollution. III. PA Applications Bearings, gears, wheels, roller shaft ...