What material is heat insulated and not afraid of fire?
According to the different raw materials are divided into rock wool and slag cotton. In 1840, the United Kingdom to achieve the melting of slag after the formation of fibers, produced slag cotton, used for building insulation, so far more than 160 years of history. Features are: thermal insulation performance, also has the fire characteristics, good sound absorption and vibration damping effect, but different materials of mineral wool class containing asphalt, glue or other organic material, easy to produce harmful substances and environmental pollution, low intensity, as the maintenance of the structure of the thermal insulation layer is easy to collapse, the production process is more complicated has been replaced by other materials.
Foam as a kind of important organic insulation materials, there are two kinds of polystyrene and polyurethane foam, which was published in 30s, the production in our country began in late 50s and 60s, which is characterized by the effect of thermal insulation performance, light weight, sound absorption properties, but the organic materials and brick wall with construction is difficult. Need the polystyrene foam plate is adhered in the walls with special binder and coupling agent, after a plurality of process, the construction is very complex. Moreover, foam plastic products have poor aging resistance, low service life, and waste materials can not degrade and cause white pollution.
Industrial production of perlite as insulation materials began in the United States in 1964Arizona, while China's expanded perlite began production in the late 60s. Expanded perlite includes perlite and pineRock and obsidian (three of which are close to the water content), due to the high temperature in 1000-1300C0, the volume of rapid expansion of 4 - 30 times, so collectively referred to as expanded perlite. Its characteristics are: low thermal conductivity, fire resistance and sound insulation performance is good, non-toxic, cheap, but have very strong water absorption, thermal conductivity due to water is much higher than that of pearlite, water will cause its insulation performance degradation, inorganic porous material, low strength, easy to break; therefore in thermal insulation applications when the need to enhance the hydrophobic and expanded perlite.
