FIRE PROTECTION AND INSULATING MEANS; FIRE-PROOF MATERIALS IN THE FORM OF PANELS AND SHEETS FOR FIRE PROTECTION OF BUILDINGS AND OTHER STRUCTURES, ESPECIALLY PANELS MADE OF MINERAL FIBERS, AND MORTAR PARTITION OR BULKHEAD SYSTEMS FOR PREVENTING FIRE FROM SPREADING WHERE ELECTRICAL CABLES AND CONDUITS PASS THROUGH WALLS AND CEILINGS
Nonmetallic Building Materials