BLOC WELD

PLYWOOD OR OTHER LAMINATED MATERIAL USING WOOD FOR ONE OR MORE OF THE LAMINATIONS; GENERAL PURPOSE AND FIRE PROOF DOORS AND PANELS; AND ALSO FOR A CEMENTITIOUS FIREPROOF AND/OR FIRE RESISTANT MATERIAL COMPRISING ESSENTIALLY CALCIUM AND ALUMINUM SILICATE WITH OR WITHOUT ASBESTOS, AND SUITABLE, FOR EXAMPLE, AS A CORE FOR DOORS, PARTITIONS, WALL PANELS AND SPANDREL PANELS, WALL STRUCTURES, BULKHEAD STRUCTURES, SAFES AND VAULTS, ROOF DECKING, AND OTHER FIREPROOF CONSTRUCTIONS