Because of low strength, the expanded perlite insulation boards application in building energy saving is restricted. This paper discuss change rules of the expanded perlite insulation board apparent density and mechanical strength with adjusting the amount of sodium silicate, pressing pressure, heating system. It turned out that good thermal insulation performance and high strength expansion perlite insulation board is prepared by mass ratio of 2.5:1 of 30% of the content of solid sodium silicate solution to expanded perlite, 0.38MPa of pressing pressure and 105°C condition of heating temperature.

This paper studied the change regulation of the electrical resistivity of alkali-free boro-aluminosilicate glasses with the rate of SrO/(CaO + SrO) in the range 600~1600°C.The results showed that a mixed alkaline effect was observed with the increase of SrO content in alkali-free aluminoborosilcate glasses: the maximam resistivity of 178Ωcm appeared at SrO/(CaO+SrO) ratio =0.24, which is much larger than 108Ωcm at SrO=0. Meanwhile, the experiment results showed that the SrO makes stronger influence on the resistivity of the glass than CaO does. The Arrhenius plots, which showed the change of the resistivity with temperature in range of 1100~1625°C, present nonlinear variation, and an inflection at about 1100°C. It proved that the electrical resistivity of the alkali-free aluminoborosilcate glasses were controlled by the ionic radius of alkaline earth metals and the viscosity of glass melts.