93763-70-3 - Perlite - Searchable synonyms, formulas, resource links, and other chemical information. OSHA comments from the January 19, 1989 Final Rule on Air Contaminants Project extracted from 54FR2332 et. [1], Perlite softens when it reaches temperatures of 850–900 °C (1,560–1,650 °F). Chemical Formula: (Mg,Fe++,Al)3(Al,Si)4O10(OH)2•4(H2O) Composition: Molecular Weight = 504.19 gm Magnesium 8.68 % Mg 14.39 % MgO Aluminum 23.01 % Al 43.48 % Al 2 O 3 Iron 9.97 % Fe 12.82 % FeO Silicon 5.57 % Si 11.92 % SiO 2 Hydrogen 2.00 % H 17.87 % H 2 O Oxygen 50.77 % O Chemical Characteristics—Perlite is neutral with a pH of 7.0–7.5, but it has no buffering capacity and contains no mineral nutrients. This formula is commonly used in water treatment. The proposed PELs were 10 mg/m3 (total particulate) and 5 mg/m3 TWA (respirable particulate): however, the final rule retains the 15-mg/m3 TWA PEL for perlite as total particulate containing less than 1 percent quartz. Md Arifuzzaman and H. S. Kim, "Prediction and evaluation of density and volume fractions for the novel perlite composite affected by internal structure formation", Construction and Building Materials, Vol 141, 2017, 201–215. Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. Fax: +90 312 223 5665. OSHA has classified Perlite as a Particulate Not Otherwise Regulated (PNOR), which has the same Permissible Exposure Limit (PEL) as that used for nuisance and inert dusts. The most common oxidation states found in nature are +3, +5, and -3. Other reported reserves are: Greece - 120 million tonnes, Turkey, USA and Hungary - about 49-57 million tonnes. 310-127-6: 100% WT . Perlite concrete mixed at a ratio of 1 part cement to 6 parts perlite has an insulation value, or "k" value, of 0.64 and a compressive strength of 125 to 200 pounds per square inch. Expansion occurs when the glassy lava rock is heated to 1600 degrees F (871 degrees C) and the water molecules trapped in the rock turn into vapor c… 93763-70-3 . Chemical Stability; Silicate-bonded Perlite makes an insulation material which is completely non-flammable, the refractory nature of the bond being a major advantage. Elements listed: Al, H, K, O, Si - search for minerals with similar chemistry. Perlite is an amorphous mineral consisting of fused sodium potassium aluminium silicate. Potassium silicate is sometimes preferred for applications where heat insulation and fire resistance are the main objectives. Address: Bestepeler Mah. Chemical Stability Silicate-bonded perlite makes an insulation material which is completely non-flammable, the refractory nature of the bond being a major advantage. Since perlite is a form of natural glass, it is classified as chemically inert and has a pH of approximately 7. CDC twenty four seven. EnvironmentalChemistry.com. The inert nature and neutrality of perlite make it a favorable medium for assessing the usefulness of various forms and levels of nutrients (Arquero et al., 2006; Wik et al., 2006). The Occupational Safety and Health Administration (OSHA) has set the legal limit (permissible exposure limit) for perlite exposure in the workplace as 15 mg/m3 total exposure and 5 mg/m3 respiratory exposure over an 8-hour workday. Its water content, however, is considerably higher (generally 3 to 4 percent); much of it is absorbed, subsequent to consolidation, from the sea or from wet sediments into which the perlite … Skip to page content; Skip to site menu on this page. Expanded perlite can be manufactured to weigh as little as 2 pounds per cubic foot (32kg/m 3) making it adaptable for numerous applications. Odorless, light-gray to glassy-black solid. Calcium silicate is a chemical compound composed of calcium and silica with the chemical formula Ca 2 SiO 4 that is naturally found in limestone. 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