Silicone Rubber Heater Puts Brakes On Truck Air Brake Moisture Problems Problem: Air brakes on trucks need protection in winter against moisture freezing that can cause brake failure. Solution: Air dryers with a Watlow silicone rubber heater that prevents venting valve freeze-up in temperatures as low as -70°F (-55°C). Watlow engineering worked with this manufacturer to improve his product quality and keep costs at a minimum. The customer sends a casting to the Watlow plant where the heater is vulcanized to the casting in a specially adapted hydraulic press. This is the most efficient method of heat transfer because there is a minimum amount of insulation (mastic or glue) between the heater and the part. Some heaters are 12 volts, others 24 volts, so Watlow color-codes the leads to decreas

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