Use equipment that provides water to the blade or grinder when sawing or grinding concrete or masonry. Be sure to only use blades and abrasive wheels that are rated as safe for use with water. Keep in mind that dust levels can remain high for some time even after cutting, grinding, or sweeping has stopped.
Respirable crystalline silica dust particles, or particles that are less than 10 micrograms ( m) in diameter, pose the greatest threat to employees working with or near crystalline silica. These dust particles occur when workers chip, cut, drill or grind objects that contain crystalline silica.
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Cutting / Grinding. Use a shroud that is attached to a dust extractor with a suction rate of at least 25CFM per inch of wheel diameter. The dust extractor filter must have a minimum 99% efficiency and a filter cleaning mechanism.
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In 1974, the United States was poised to adopt a ban on silica sand for abrasive blasting on the recommendation of the National Institute for Occupational Safety and Health (NIOSH), but as discussed in our article on the Silica Rule, political forces hampered adoption, and wet abrasive blasting technology failed to find a foothold in North America.
Crystalline silica refers to a group of minerals composed of silicon and oxygen found in asphalt, concrete and rocks. Respirable refers to the silica being small enough to easily inhale.
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Control Silica Exposure in Construction with HEPA Filtration Dust Collection Systems from CS Unitec. Collect dust, concrete dust, drywall dust, coatings and more with CS Unitec power tools and vacuums. An industrial dust collection system will help protect workers from hazardous dust created when drilling, sawing, and grinding concrete,...
An Introduction: How the Model Silica Specifications Were Developed. The following specifications are designed primarily to protect workers from inhaling silicacontaining dust while grinding, cutting and sawing masonry, operations that are common in street and sidewalk repair, brick and block work, and replacing mortar in aging brick buildings ...
Respirable Crystalline Silica • Silica is a natural substance that is present in many parts of the earth • Found in Construction Materials Like Sand, Gravel, Concrete Blocks, Stones and Mortar • Respirable Crystalline Silica is generally attributed to certain construction operations
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silica, while natural stone contains 550 per cent. The workplace exposure standard for RCS will be exceeded if the amount of dust a worker breathes over a full shift contains more RCS than the amount shown here next to the five cent piece.
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Although most diseases associated with silica exposure are not curable, they are preventable. Identify controls Here are some measures you can take to reduce the amount of silica in the air when cutting or grinding. PLAN BEFORE CUTTING OR GRINDING • Notify workers that you will be generating silica dust. Tell them to keep at least 10 m (3 ft) away.
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Use other products that contain glass beads, pumice, steel grit, or walnut shells. Determine ahead of time if rocks or earth are likely to contain silica. Control dust by using wet drilling and sawing methods (wet processes), blastcleaning machines and cabinets, and enclosed cabs on earth moving heavy equipment.
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Grinding: Wet grinding is highly effective in reducing silica exposures. Water provides excellent dust control during tasks involving abrasive action on concrete. When applied at the point where dust is generated, water wets the dust particles before they can become airborne.
How is crystalline silica created? Materials at risk for silica exposure include rock, concrete, brick, block and mortar. Any highenergy operation such as cutting, sawing, grinding, polishing, drilling and crushing stone can create respirable crystalline silica.
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