Keumkang gypsum board is made of two layers of paper compressing a padding of gypsum in stable crystallized form before molding. It has outstanding fireproof, insulation and sound-absorbing qualities. Keumkang also produces waterproof gypsum boards for use in bathrooms and kitchens and fireproof gypsum boards for use in fireproof facilities as well as such secondary materials as joint compound, gypsum bond and join tapes.