polystyrene verses polyisocyanurate cores

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Polystyrene Cores: The L-series door with polystyrene core insulation and the CE-series door have full slab polystyrene core.Polyurethane Cores: The L-series door with polyurethane core has honeyco...
Insulated Core Options: Steelcraft L-Series doors are available with the following 2 optional insulated cores: Polystyrene slab - this core is available in non fire rated and fire rated doors...
Polyisocyanurate foam (polyiso) is modified polyurethane foam but offers greater dimensional stability over a wider service temperature range.Polyisocyanurate foam is specifically formulated to pro...