Perlite Group :: What is Perlite? :: perlite, expanded perlite,

[http://www.perlitgroup.com/eng/] Рус Укр Eng What is Perlite? Search Мain News What is Perlite? Perlite in construction Perlite and agroculture Perlite in ecology Filtroperlite Perlite in metallurgy Products and prices Contacts Sitemap Perlite is the volcanic glass containing 65-75 % of SiO2 and 2-5 % of H2O. The characteristic property of perlite is that if subject to rapid heating of 900 to 1.200°C it increases its volume 4 to 20 times. This happens because perlite includes the bound water which extends during heating according to a well-known popcorn effect and adopts the form of a porous swollen material. The size of swollen pellets varies between 1 and 10 mm, with apparent density of 75 to 150 kg/m3. Thanks to these numerous tiny voids the volcanic rock becomes light and acquires unique thermal and sound-proofing properties. Besides it has perfect refractory properties, chemical inertness and is not damaged by animal pests, among other things. Perlite advantages Typical physical properties of perlite № п/п Property Value 1 Colour White 2 Brightness, % GE 70-80 3 Apparent density, kg/m 3 50-300 4 (Mohs) hardness index 5,5 5 pH Neutral 6 Water absorption, % of mass 200-600 7 Ability to absorb oils, gram of oil per gram of perlite 50-100 8 Melting point, C° 980 9 Burn losses (3 hours under t of 900°C), % up to 1,5 10 Humidity, % up to 1,0 11 Maximum strength, MPa up to о 6,0 12 Porosity, % 70-85 13 Portion of air, % 80-95 14 Thermal conductivity, W/mK 0,043-0,093 15 Thermal diffusivity, m 2 /sec 0,632-0,330 Typical chemical properties of perlite Element composition, % Chemical composition, % Silicon Si 33,8 Silicon dioxide SiO2 72,08 Aluminium Al 7,2 Alumina Al2O3 12,92 Potassium K 3,5 Titanium dioxide TiO2 0,90 Sodium Na 3,4 Iron oxide Fe2O3 1,50 Iron Fe 0,6 Magnesium oxide MgO 0,63 Calcium Ca 0,6 Quick lime CaO 0,88 Magnesium Mg 0,2 Caustic soda Na2O 3,76 Mica - 0,2 Potassium oxide K2O 4,33 Oxygen O 47,5 Bound water H2O 3,0 3.03.2011 / ... More 19.01.2011 / ... More OUR PARTNERS All rights reserved, 2011 Мain | News | What is Perlite? | Products and prices | Contacts | Sitemap Developed by www.artery.com.ua