Materials

What Is Mineral Core?

A fire-resistant door core made from mineral-based materials and used in certain rated assemblies.

A mineral core is an internal door construction made with mineral-based materials chosen for fire-resistance and related performance requirements. It is commonly found in doors designed for specific fire-rated applications.

Buying Considerations

Verify the required fire rating and the exact listed assembly, including the frame, hinges, lockset, seals, and glazing where applicable. Core construction alone does not establish the rating of the complete opening.

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