What are door cores?

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These references are from an old and outdated SDI 100 specification. The new specification SDI 100 ANSI A-250.8 does not contain letter designations for core material. Core constructions designat...
ND locks can be extended up to 6" Extended Outside.  
All doors are tested in accordance with ASTM C1363 and SDI 113:B18 Series (Steel Stiffeners)     U-Factor = 0.50     R-Value = 2.01B16 Series (Steel Sti...
Falcon SZ Series Door is the economy Steelcraft commercial grade door recommended light commercial applications when architectural specification are not needed. Options: The SZ-Series door is...
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...