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Two panels, two cores

Don Ross compares an expanded polystyrene core with a urethane core: R-value per inch, the FM 4880 corner fire test, and why it matters to a business insured under FM.

Don Ross, D.W. Ross Company. 0:46.

Transcript

This is a laminated panel. This has an expanded polystyrene core, which is an R-factor of 4.13 per inch. This is a petroleum-based foam, so it doesn't meet the FM 4880 corner fire test, nor has it been tested by UL. So this panel, if you're a Factory Mutual approved business entity, you have to have FM approval. We're not going to show any more of this panel to you. This, on the other hand, is FM 4880. It is a urethane core. It has an R-factor of 8 per inch. It's a polyisocyanurate, non-CFC cured foam.

Don Ross, President, D.W. Ross Company

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