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1. The two forms of silica are crystalline (structured) and non-crystalline (amorphous)
2. Silicosis is a disabling non-reversible and sometimes fatal lung disease caused by overexposure to:
3. OSHA's permissible exposure limit (PEL) for crystalline silica is dependent upon:
4. The more crystalline silica there is in dust, the less of the dust you should breathe
5. Which of the following is NOT considered an acceptable engineering control to reduce exposure to crystalline silica
6. When respirators are used, the employer must establish a comprehensive respiratory protection program, required in the OSHA respiratory protection standard (29 CFR 1910.134 and 1926.103) and as outlined in the NIOSH Guide to Industrial Respiratory Protection (NIOSH 1987a).
7. With the exception of certain synthetic vitreous fibers, studies have found amorphous silica to be biologically inert when ingested and inhaled
8. The OSHA PEL for non-crystalline (amorphous) silica as % silica content of the dust from a sample collected over an 8 hour time period is
9. Synthetic vitreous fibers (SVF) are a group of fibrous inorganic materials that contain aluminum or calcium silicates and other trace oxides and metal and are sometimes called Synthetic Mineral Fibers.
10. The primary uses of Synthetic Vitreous Fibers are
11. Only very thin fibers with diameters of less than ___ are able to be carried into the lower respiratory tract of humans.
12. OSHA’s PEL for synthetic vitreous fibers in inert or nuisance dust in general industry is
13. Which of the following is NOT considered an acceptable engineering control to reduce exposure to synthetic vitreous fibers