How many methods of expansion of vermiculite?
Expanded vermiculite is vermiculite as raw material, after drying, crushing and roasting, the volume of short fairy in a short period of time increases rapidly, expanding (6-20 times) and becoming a kind of golden granular material. With light weight, small thermal conductivity, fire protection, corrosion resistance, chemical stability, non-toxic, tasteless and so on. The bulk density of expanded vermiculite is about 80-180kg per cubic.
When the expanded vermiculite is in the drying state, it has good frost resistance. When the degree of -20 is 15 times, the particle size of the expanded vermiculite is invariable. Expanded vermiculite is inorganic, so it is free of fungus, does not decay, does not deteriorate, and is not easily bitten by moth eaten mice. Expanded vermiculite is alkali resistant and non acid resistant, so it is not suitable for acid etching.
. The expansion of vermiculite was fine particle structure of thin laminations, filled with air, so they have low thermal conductivity, thermal expansion coefficient of vermiculite tears is generally 0.07-0.07w/m.k, under normal temperature condition (temperature range of 20-30 degrees) technology performance of thermal conductivity and particle size and bulk density of expanded vermiculite between. Product specifications. The refractoriness of expanded vermiculite is 1300-1350 degrees, and the safe service temperature is -30 ~ 1100 degrees. Swelling vermiculite, some moisture absorption rate is small, in the relative humidity of 100% in the environment, after 24 hours, the moisture absorption rate is generally not greater than 2%.
