Transcription of Crystalline Silica - Quartz and Cristobalite
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Crystalline Silica - Quartz and Cristobalite
Crystalline Silica Quartz and Cristobalite Method number: ID-142. Version: 3. Target concentration: 50 g/m (for Quartz and Cristobalite ). 3. OSHA PEL: 50 g/m (combined polymorphs). 3. 25 g/m action level 3. ACGIH TLV: mg/m (respirable fraction). ( - Quartz and Cristobalite ). Procedure: Samples are collected by drawing workplace air through pre-weighed 5- m pore size, 37-mm diameter low ash polyvinyl chloride (PVC) filters preceded by 10-mm nylon Dorr Oliver cyclones. The weight of the respirable dust is determined by gravimetric analysis. The PVC filters are dissolved and the samples are suspended in tetrahydrofuran (THF).
4 of 39 fracturing.18 Silica flour is an extremely fine grade of silica sand that has been used as abrasive cleaners and inert fillers. It is also used in toothpaste, paints, rubber, paper, plastics, cements, road surfacing materials, foundry applications, and porcelain.19 In 2013, OSHA estimated that more than 1.8 million U.S. employees in the construction
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Hazardous Substance Fact Sheet, Quartz, Crystalline, Silicon, SILICA, CRYSTALLINE by IR 7602, SILICA, Respirable Crystalline, by IR, SILICA, CRYSTALLINE by IR KBr pellet, Occupational Exposure to Respirable Crystalline, SAFETY DATA SHEET, About silicosis in the ready mix, SAFETY DATA SHEET Date Revised: 04