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Thermomass® achieves 4-hour ASTM E-119 fire resistance rating

December 9, 2012 (Boone, Iowa):  Thermomass®, the leading manufacturer of building insulation systems for the concrete industry, is proud to announce the successful completion of the ASTM E-119 fire test.

The fire test was conducted on a sandwich wall panel consisting of a 2-in exterior wythe of concrete, 2-in insulation core, and a 5-in interior wythe of concrete. The interior wythe was loaded to 4,000 pounds per foot gravity load and exposed to fire for a duration of 4-hours, with temperatures reaching 2,000 °F.

According to Darryl Dixon, Director of Technical Services at Thermomass, “During the 4-hour test, the temperature on the exterior wythe of concrete increased by only 130 °F, which is only 50% of the allowed temperature increase per ASTM E-119.”

The successful 4-hour mark is the first and only ASTM E-119 test on an integrally insulated sandwich wall using an energy efficient FRP wythe connector. Venkatesh Seshappa, PE, SE, Director of Engineering at Thermomass noted, “The ASTM E-119 test expands on the ICC-ESR on our MC/MS Series connectors, and provides an unprecedented level of testing achievements for the concrete sandwich wall panel industry.”

About Thermomass

Thermomass is headquartered in Boone, Iowa and manufactures insulation systems for a variety of concrete wall applications. For more information about Thermomass call (800) 232-1748 or visit our web site at

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