One of the safest insulation materials for use inside buildings. Insul-phen meets the fire standard requirements achieving ASTM E84 25/50 flame and smoke rating. Insul-phen, and its production process, is 100% free of CFCs and HCFCs. Complying with all international standards, it has a Zero Ozone Depletion rating. Insul-phen has one of the best k factor ratings of any commonly specified insulation material. Its high thermal efficiency means that the actual insulation thickness is significantly lower than other materials