What Is Thermal Mastic?


Thermal Mastic is a non-drying, pumpable heat transfer compound used in a variety of applications where surface to surface heat transfer would be beneficial. rv refrigerator Generally used in the appliance industry for sealing gaps between metallic surfaces, it is a useful tool to promote efficient, safe, and effective operation of various refrigeration units, air conditioners, and freezers.

The mastic is typically made up of a vehicle which may be a high viscosity petroleum product, a finely divided filler, and a small amount of wetting agent such as oleic acid or a glycol. The mastic may also be comprised of some amount of other additives such as resin, polybutene or a combination of filler and wetting agent, to further increase adhesion.

One of the most common uses of thermal mastic is in conjunction with polyurethane foam insulation in refrigerators, freezers and other polyurethane insulated products to provide good heat transfer between refrigeration tubing that extends from the cooling compartment or outer shell to the interior walls of the unit and the foam insulation within. The thermal mastic is applied to the tubing at the points where the tubing makes metal to metal contact with the inner refrigeration wall or the freezer plate and fins of the unit.

Moreover, the mastic is used to seal the foam block around which the evaporator coil of the unit is located. As a result of its good performance in the thermally conductive category, the mastic is used to prevent air leaks.

Another use of the mastic is in conjunction with the plastic mold heater thermostat used on the ice maker of some refrigerators and freezers to seal the heat source to the molding, thus improving the efficiency and life span of the device. This application involves the mastic being applied to the base of the thermoplastic mold and the top of the plastic housing, as well as the top of the lid, in order to form a strong bond that will not come undone when the icemaker is disassembled.