What cores are available for the Republic DL series doors?

Standard Core:
Honeycomb
Optional Cores:
1 lb density expanded Polystyrene. 
2 lb Polyurethane
250˚ Temperature Rise Mineral Fiberboard capable of withstanding a maximum of 250˚ temperature rise in
30 minutes.
Steel Stiffened (20 gauge standard) with fiberglass batting.


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