... plastic Machinery, mould, the cable machinery, chemicals, rubber, oil and other devices. Aluminum heater (circle) with the characteristics of long life, ... , corrosion-resistant, anti-magnetic field, and other advantages. Use: for plastics, rubber, machinery and so on heating extruders in the industry ... , if the insulation resistance of less than 1 ohm a long-term, baking in the oven with 200 for ...