How to Accurately Calibrate Your Vulcanizer

How to calibrate your vulcanizer simply and accurately.

Last edited: 8/16/2018

An accurately calibrated vulcanizer is essential to creating strong, defect-free molds every time. Follow these simple instructions to check the accuracy of your vulcanizer temperature readings at any particular setting.

Please note that some rubber products require precise temperatures (±1°F) for proper vulcanization.

Look on the side of your vulcanizer platens; some models have two or more small ports or vents that are open to the heating elements. Insert a metal stem thermometer into each port and measure the temperature inside the ports. Average the readings to get a temperature for combined platen performance.

If your vulcanizer has no ports, put the thermometer against one platen, using a soft asbestos-free soldering pad to insulate the thermometer from the opposite platen. Close the platens and measure the temperature.

Reverse the pad and thermometer so that the thermometer is pressed against the other platen. Close the platens, and measure the temperature again. Average the two readings.

Loosen the set-screw on the temperature control knob and turn the knob clockwise or counter-clockwise as needed to adjust the accuracy. Tighten the screw when the adjustment is complete.

Rio Grande offers a variety of vulcanizers to meet your mold making needs.