What is the heat resistance of rigid expanding foams?

The heat resistance of rigid foams will range from about 110°F (43°C) to 125°F (52°C).

There are variables that will affect the heat resistance of a foam casting:

• Higher density foams, such as FOAM-iT! 26, will have higher heat resistance than lower density foams, such as FOAM-iT! 5.
• Casting thickness will also make a difference. A foam casting that is 3" (6 cm) thick will have better heat resistance than a casting that is 1/2" (1 cm) thick.

What will happen to a rigid foam casting that is exposed to higher than recommended heat?

Depending on the temperature and duration of heat exposure a rigid foam casting will soften and may distort depending on casting thickness and configuration.

Caution: Rigid foam castings exposed to temperatures above 400°F (205°C) for even a short period will degrade. At a high enough temperature, some foam products may catch fire and burn creating a very hazardous breathing environment. Consult the SDS for the rigid foam product you are using for more information.