METHOD FOR FORMING HEAT-RESISTANT/HEAT-INSULATING MEMBER, METHOD FOR FORMING PRELIMINARILY FORMED MATERIAL, FORMED HEAT-RESISTANT/HEAT-INSULATING MEMBER, FORMED HEAT-RESISTANT/HEAT-INSULATING MEMBER FOR ELECTRICAL HEAT STORAGE HEATER, HYDRAULIC COMPOSITION USED IN THE SAME AND DIE FOR VACUUM DEHYDRATION COMPRESSION FORMING

摘要

PROBLEM TO BE SOLVED: To inexpensively produce a lightweight heat-resistant/heat-insulating member (specific gravity = 0.2 to 0.85) stable and having high performance and good appearance, which is suitable for an electrically generative space heater. SOLUTION: The method for forming the heat-resistant/heat-insulating member comprises a first process for providing a hydraulic composition which is obtained by adding a prescribed amount of water to 100 wt.% powdery composition containing 50 to 70 wt.% gypsum reactive with water, 10 to 30 wt.% inorganic lightweight aggregate and 10 to 30 wt.% calcium silicate, a second process for forming a preliminarily formed material by forming the hydraulic composition using a forming die, and a third process for curing the preliminarily formed material after taking it out of the forming die.