Asbestos-free, hydraulic inorganic material-based sheet products and process for their production.

摘要

An aqueous dispersion containing an inorganic sheet-forming component preferably silica fume pulp, reinforcing fiber, fibrous inorganic material, flocculant and hydraulic inorganic material in specified proportions is excellent in dispersibility of the reinforcing fiber, retention of the hydraulic inorganic material and other aspects in spite of the absence of asbestos therein. Sheets formed from the aqueous dispersion in the manner of papermaking are resistant to layer separation and to cracking in the step of shaping such as corrugation. Products derived from the sheets are excellent in physical properties, such as strength.