Criteria for updating the crystalline silica gel
NOTE: OSHA will delay enforcement of the respirable crystalline silica standard for construction until September 23, 2017, to conduct additional outreach and provide educational materials and guidance for employers.(see Memorandum link below for more details) For a full listing of FAQs, go here. Crystalline silica is a common mineral found in many naturally occurring materials and used in many industrial products and at construction sites.
For example, OSHA created the table in response to small construction employers’ claims that measurement is expensive and difficult.Both standards (construction and general industry/maritime) contained in the final rule take effect on June 23, 2016.Industries have one to five years to comply with most requirements, based on the following schedule: Construction - June 23, 2017, one year after the effective date.How can exposure to crystalline silica affect workers’ health?Inhaling very small (“respirable”) crystalline silica particles, causes multiple diseases, including silicosis, an incurable lung disease that can lead to disability and death.For the automotive industry, any foundries processing sand as part of the metal casting operation and blasting operations that use sand as the blast media would be affected.
The new silica rule not only redefines the permissible exposure limit, but also includes more stringent requirements affecting engineering controls, worker protection, training, and even medical exams.
forms either a rigid mass or a gelatinous precipitate from which soluble materials are removed by washing with water.
The water is finally removed by heating, leaving a glassy, granular solid.
A common commercial form has a bulk density of about 0.7 gram per millilitre and a surface area of about 750 square metres per gram, more than five acres per ounce.
The Occupational Safety and Health Administration (OSHA) has issued a final rule limiting worker exposure to respirable crystalline silica which should result in lower incidence of lung cancer, silicosis, chronic obstructive pulmonary disease and kidney disease in America's workers.
It wasn’t until OSHA’s creation in 1971 that any limits on exposure to respirable silica were set.