Patent ID: 6464771
Filing Date: 2002-10-15
Classification: C04B,Y02P

Abstract:
A hardened calcium silicate material having:Ib and Ia, wherein a ratio of Ib to Ia is greater than 3; and a specific gravity of 0.2 or more but less than 0.7, the hardened calcium silicate material being substantially free from bubbles having a maximum diameter which is greater than 200 nm, wherein among pores measured by mercury porosimetry, the ratio of pores having a pore size of 1.0 &mgr;m or more is from 1 % by volume to 15 % by volume, wherein Ib represents a diffraction peak intensity of a tobermorite (220) plane in powdery X-ray diffractometry; and Ia represents a minimum diffraction intensity in an angle region located between two diffraction peaks in tobermorite (220) and (222) planes.