silicon dioxide

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Related to Crystalline silica: Amorphous silica

silicon dioxide:

see silicasilica
or silicon dioxide,
chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white.
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silicon dioxide

[′sil·ə·kən dī′äk‚sīd]
(inorganic chemistry)
SiO2 Colorless, transparent crystals, soluble in molten alkalies and hydrofluoric acid; melts at 1710°C; used to make glass, ceramic products, abrasives, foundry molds, and concrete.

silica, silicon dioxide

A white or colorless substance, nearly insoluble in water and in all acids except hydrofluoric; extremely hard; fuses to a colorless amorphous glass.

silicon dioxide

(SiO2) A hard, glassy mineral found in materials such as rock, quartz, sand and opal. In metal oxide semiconductor (MOS) chip fabrication, silicon dioxide is used to create the insulation layer between the metal gates of the top layer and the silicon elements below. See silica gel.
References in periodicals archive ?
A joint Occupational Safety and Health Administration and National Institute for Occupational Safety and Health Hazard Alert defines dust control measures to protect workers from significant crystalline silica exposure during manufacturing, finishing, and installing natural and manufactured stone countertops, leading types of which bear 60-95 percent silica content.
Abrasive blasting with silica sand, often used to prepare surfaces for painting, has been associated with exposures up to 200 times the CDC's National Institute for Occupational Safety and Health (NIOSH)-recommended exposure limit for respirable crystalline silica dust (0.
The new rule reduces the permissible exposure limit (PEL) for respirable crystalline silica to 50 micrograms per cubic meter ([micro]g/[m.
Occupational exposure to respirable crystalline silica can occur in mining, hydraulic fracking, foundry work, abrasive blasting operations, paint manufacturing, glass and concrete product manufacturing brick making, china and pottery manufacturing, and construction activities, such as cutting and drilling stone and rock, masonry work, and jack-hammering
The findings in this report highlight continued lack of knowledge about proper selection and use of respirators and other silicosis-prevention practices among workers in occupations with exposures to crystalline silica.
VCT floor tile: Existing in-place resilient floor coverings and asphaltic adhesives may contain asbestos fibers and/or crystalline silica.
Respirable Crystalline Silica is one of the most abundant materials in the Earths crust.
Circuit Court of Appeals for review of the crystalline silica rule.
According to OSHA, crystalline silica is a common mineral found in many naturally occurring materials and used in many industrial products and at construction sites.
The final rule establishes a permissible exposure limit (PEL) for respirable crystalline silica of 50 micrograms as an eighthour time-weighted average that was opposed by industry as unnecessary, not feasible, and not supported by scientific evidence.
5 [micro]m and smaller) and crystalline silica (quartz).
Silicosis is a potentially fatal but preventable occupational lung disease caused by inhaling respirable crystalline silica (silica) (1).