GYPSUM BUILDING MATERIAL HAVING MAGNETIC LAYER MAGNETIC JOINT TREATMENT MATERIAL AND METHOD FOR PRODUCING GYPSUM BUILDING MATERIAL HAVING MAGNETIC LAYER

摘要

The present invention includes a gypsum-based building material and a magnetic layer covering at least a portion of the surface of the gypsum-based building material, wherein the magnetic layer contains iron and a binder, and the iron content per unit area is 0.3 kg/m 2 or more, It provides a gypsum-based building material including a magnetic layer having a density of the magnetic layer of 2.0 g/cm 3 or more.