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👉 Check Latest PriceCelotex US4025 is a premium performance PIR solution for floor perimeter upstands. Celotex US4025 is manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (ODP) and a low global warming potential (GWP). Designed to limit the thermal bridging at floor junctions and is easy to cut and install.