This is due to the higher weathering resistance of hydrothermally altered rock. 这是由于热液蚀变岩石具有较高的抗风化力的缘故。
The IFD is a measure of hardness or resistance to compression. 高水量导致泡沫的质量和耐久性变差，这将在后文解释。
It provides high strength, low price and superior fire resistance and head insulation, weather and sound resistance and recycle material. 综合砖体的高强度，价格低，防火，隔热，防潮，耐风化，隔音，循环再用等优点。
