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.The final rule was published in the Federal Register on March 25, 2016 with an effective date of June 23, 2016.The new standard applies to any industry that uses sand as part of the manufacturing process, where employees could be exposed to respirable crystalline silica (quartz, cristobalite, and/or tridymite).
OSHA approved State Plans have six months to adopt standards that are at least as effective as federal OSHA standards.
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.
It wasn’t until OSHA’s creation in 1971 that any limits on exposure to respirable silica were set.
Even so, the original rule only required that employers stay below the permissible exposure limit.