Fire Retardant Doors

Most of the present solid-core doors now on the market can pass the standard fire exposure test for a period of 20 minutes. However, when the required resistance is raised to 1/2 hour or more, special constructions and special materials are required. To develop fire-retardant lumber it is necessary to inject chemicals into the lumber under pressure. Care must be exercised in the gluing of fire-retardant lumber. Most fire-retardant doors of the solid-core veneered-type are bonded with phenolic resin. Some manufacturers have found that resorcinol glue offers greater resistance to flame. In many cases hide glue produced the better bond especially when treated wood is bonded to treated wood.

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