Polyorganosiloxane Waterproofing for Porous Ceramics

Liquid waterproofing agents based on polyorganosiloxanes have been invented for use in treating porous, lightweight, fibrous ceramic thermal-insulation materials in both tile (rigid) and blanket (flexible) forms. Whereas silane-based waterproofing materials developed previously for this purpose are toxic and volatile and must be applied in tedious procedures (involving repeated injection at multiple locations by use of syringes), the present formulations are nontoxic and nonvolatile and can be applied by ordinary coating procedures.