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Door Cores

Honeycomb:  Structural small cell 1" (25mm) max kraft paper honeycomb.  Weight; 80 lb (36kg) per ream min. density; 1.03 pcf (16.5kg/m3) min. sanded to required thickness.
Polystyrene:  Rigid extruded fire retardant closed cell board.  Density; 1 to 2 pcf (16 to 32 kg/m3) thermal values; R6.0 (RSI 1.05) min.
Polyurethane:  Rigid modified polyisocyanurate closed cell board.  Density; 2.0 pcf (32 kg/m3) min. thermal values; R11.0 (RSI 1.93) min.

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Fibreglass:  Loose batt type density; 1.5 pcf (24 kg/m3) min. thermal values; R11.0 (RSI 1.93) min.
Temperature Rise Rated (TRR): Core composition to limit temperature rise on the unexposed side of door to 450 oF (250 oC) at 30 or 60 minutes as determined by governing building code requirements.  Core to be tested as part of a complete door assembly in accordance with ASTM E-152 or NFPA 252 covering the Standard Method of Tests of Door Assemblies and shall be listed by a nationally recognized testing agency having a factory inspection service.
Steel Stiffened: stiffeners installed @ 6" o.c. to provide extra strength and support for the door.  In addition steel stiffeners are required when installing Rockwool interior cores.

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