초록 ▼

This invention discloses a core for a fire-resistant door with wooden stiles and rails forming the peripheral edge and a slab filling the space therebetween comprising a cured mixture of magnesium oxi-chloride with inclusions of fibreglass strands and perlite. Also disclosed is a method of making sa

This invention discloses a core for a fire-resistant door with wooden stiles and rails forming the peripheral edge and a slab filling the space therebetween comprising a cured mixture of magnesium oxi-chloride with inclusions of fibreglass strands and perlite. Also disclosed is a method of making same in which the wooden stiles and rails form the sides of a mold and the core is formed by pouring a mixture on a flat surface with a non-adhering coating and curing the core in place so that it bonds to the stiles and rails.

대표청구항 ▼

A core for a fire-resistant door comprising wooden stiles and rails forming the peripheral edges of said core; a slab filling the space between the surfaces of and surrounded by said stiles and rails; said slab comprising a cured mixture of magnesium oxy-chloride containing inclusions of fibreglass

A core for a fire-resistant door comprising wooden stiles and rails forming the peripheral edges of said core; a slab filling the space between the surfaces of and surrounded by said stiles and rails; said slab comprising a cured mixture of magnesium oxy-chloride containing inclusions of fibreglass strands, and perlite. A method of making a fire-resistant door core comprising the steps of forming a rectangular frame of stiles and rails; fastening a sheet of planar material to the underside of said frame to provide a bottom to a mold formed by the cavity surrounded by said frame stiles and rails; pouring a mixture of material curable to form a core slab in the cavity formed by said frame; allowing said material to cure and bond to said stiles and rails to form an inner panel.