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TRYMER 25-50 PIR Insulation offers the same, great thermal performance of TRYMER PIR but with a lower flame/smoke rating that meets the ASTM 84 Fire Hazard Classification Rating. TRYMER 25-50 has an ASTM E84 flame spread/smoke developed performance of < 25/50 at up to 1.5″ thickness which makes it ideal for use in chilled water applications or anywhere flammability is the greatest concern and governed by codes but where energy efficiency and water resistance are still important.