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Invisible hinges and closures can be used for hollow metal, metal sheets, tin-plated, steel composite materials, or wooden core swinging fire doors and door frames, with a fire resistance rating of 20 minutes. The door height must not exceed 20 inches, each hinge must not exceed 60 pounds, and each closure must not exceed 55 pounds. For the 180-degree heavy-duty broken bridge aluminum invisible hinge, its design supports a load-bearing capacity of 80 kilograms. Another type of 180-degree heavy-duty invisible hinge has a load-bearing capacity of 100 kilograms and is made of SUS304 stainless steel material with a surface sandblasting treatment.