Dec 10 2013nbsp018332A study in Chile found that a switch from manual carving to the use of power tools for carving pottery resulted in extremely high levels of silica dust 4 A report from the Centers for Disease Control and Prevention in 2004 noted cases of silicosis occurring among dental assistants possibly exposed while grinding casts and porcelains which can.
Silicosis is an incurable occupational lung disease that effects nearly everyone in the construction industry Silicosis is caused by inhalation of crystalline silica dust also known as crystalline forms of Silicon dioxide Silica is the basic component of sand and gravel.
8220An estimated 95 of silicon dioxide produced is consumed in the construction industry e g for the production of Portland cement 8221.
Every contractor is free to choose the preferred method to cut grind or polish the concrete Grinding without any kind of dust control should never happen as it is very dangerous to everyone8217s heath.
The other 2 methods you can choose are vacuum dust collection used in dry grinding or water dust collection used in wet grinding.
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There is no compelling reason to put human lives at risk by dry grinding and polishing.
Below is an excerpt of an articles published by OSHA that can help us to understand better the issues about dry grinding dry cutting or dry polishing Also thanks to this online documentation we were able to choose the right way to follow and we can repeat with conviction that our preferred method is wet grinding and wet polishing because dust that is wet is less able to become or remain airborne.
In comparison OSHA reported a significantly higher exposure at another site on a day when wet methods were not used due to cold weather The employee dry cut concrete block outdoors for a similar period of time nearly 6 hours but in this case experienced an 8 hour average exposure of 2 mgm3 OSHA Case Files.
Exam What is Crystalline Silica True T or False F 1 T FCrystalline silica is a natural mineral found in quarried materials such as granite and slate 2 T FOver exposure to crystalline and can lead to serious sometimes fatal illnesses including silicosis lung cancer tuberculosis in those with silicosis and chronic obstructive pulmonary disease COPD.
To better protect workers exposed to respirable crystalline silica OSHA has issued two new respirable crystalline silica standards one for construction and the other for general industry and maritime OSHA will begin enforcing most provisions of the standard for construction on September 23 2017 and this course is in compliance with the training requirements listed in the standard.
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