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 ?

workers remain potentially exposed to respirable crystalline silica (5).

Silicosis mortality trends and new exposures to respirable crystalline silica--United States, 2001-2010

The presence of crystalline silica needs to be clearly labelled; if it's in a greater concentration than 0.1% then a safety data sheet must accompany any products where this is the case.

Silica dust--much more than a nuisance!

1999); and crystalline silica linked with rheumatoid arthritis, systemic sclerosis, systemic lupus, glomerulonephritis, and small-vessel vasculitides (Koeger et al.

Silica exposure and systemic vasculitis

workers are exposed each year to respirable crystalline silica," Biggs said.

Dust storm: a sudden rise in silicosis claims is reminiscent of asbestos litigation, but this time insurers are blocking the turbulence

Research conducted by Burns, Mozzon, and Ottoboni has indicated that operators of heavy equipment are frequently exposed to airborne dust containing concentrations of crystalline silica that exceed permissible exposure limits (PELs) [2-4].

Quantifying the Exposure of Heavy-Equipment Operators to Respirable Crystalline Silica Dust

OSHA's Crystalline Silica Rule: What Should Your Foundry Be Doing Now?

Resources to Prepare for OSHA's Silica Rule

Even though all trade contractors will be required to ensure that they are limiting exposure to crystalline silica on a jobsite, the general contractor will be held responsible for their sub-contractors, too.

Labor & Industries--Silica Rule

The timing of this year's event coincides with the September 23rd 2017 enforcement of the Occupational Safety and Health Administration (OSHA)'s Crystalline Silica Standard for Construction under 29 CFR 1926.1153.

Connexion Announces Their 2nd Annual Safety Training Event and Tool & Safety Product Expo

For Occupational Health: milestones set were that by December 2024, 95% of all exposure measurement results will be below the milestone level for respirable crystalline silica of 0.05 mg/m3, for coal dust respirable particulate of 1.5 mg/m3 (

South Africa : Mineral Resources on Occupational Health and Safety summit

Occupational Safety and Health Administration (OSHA) will soon publish a final workplace exposure standard for crystalline silica that will cut the permissible exposure limit in half.

Silica rule is regulatory overkill

Polyfil 35 is said to offer acid resistance, reinforcement and very low crystalline silica and salt content.

Kaolin clay for rubber

A high proportion of the radiographs suggested silicosis, a disease caused by inhalation of crystalline silica. Surface coal mine operators should monitor worker exposures closely to ensure that both respirable dust and silica are below recommended levels to prevent CWP.

Pneumoconiosis and advanced occupational lung disease among surface coal miners--16 states, 2010-2011