crystalline silica encyclopedia


Silicic | Encyclopedia.com

Silicic Igneous rocks are classified by geologists using various schemes. One of the several schemes based on chemical composition divides igneous rocks into four categories according to silica (silicon dioxide, SiO2) content: (1) Rocks containing more than 66% silica are silicic. Source for information on Silicic: World of Earth Science dictionary.

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Silicas - definition of silicas by The Free Dictionary

Define silicas. silicas synonyms, silicas pronunciation, silicas translation, English dictionary definition of silicas. ... Encyclopedia. Tools. A; A; A; A; Language: ... Mineral fillers include products with less than 0.1% free crystalline silica, surface-treated calcium carbonates in …

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Silicon dioxide | SiO2 - PubChem

Silicon dioxide | SiO2 or (SiO2)n or O2Si | CID 24261 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

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Silica - ScienceDirect

Silica (SiO 2) is a commonly occurring compound in nature and serves as a basic raw material for silicate ceramics and silicate glasses.It can exist in various crystalline modifications as well as in the noncrystalline form (vitreous silica). It also occurs as a noncrystalline oxidation product on the surface of silicon and silicon compounds such as silicon nitride and silicon carbide.

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29 CFR § 1910.1053 - Respirable crystalline silica. | CFR ...

The purpose of this Appendix is to provide medical information and recommendations to aid physicians and other licensed health care professionals (PLHCPs) regarding compliance with the medical surveillance provisions of the respirable crystalline silica standard (29 CFR 1910.1053).Appendix B is for informational and guidance purposes only and none of the statements in Appendix B should be ...

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Glass - Wikipedia

Glass is a non-crystalline, often transparent amorphous solid, that has widespread practical, technological, and decorative uses in, for example, window panes, tableware, optics, and optoelectronics.The most familiar, and historically the oldest, types of manufactured glass are "silicate glasses" based on the chemical compound silica (silicon dioxide, or quartz), the primary constituent of …

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Silicon Dioxide - an overview | ScienceDirect Topics

Silica represents a well-suited material for biomedical applications and in particular to dentistry. Chemically, silica is an oxide of silicon (silicon dioxide, SiO 2). Silica in the form of orthosilicic acid is the form predominantly absorbed by humans and is found in numerous tissues including bone, tendons, aorta, liver, and kidney.

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Difference Between Silicon and Silica - DifferenceBetween.com

 · The key difference between silicon and silica is that silicon is a chemical element whereas silica is a chemical compound.. Silica is a common oxide form of silicon. Silicon is commercially prepared using silica in an electric arc furnace. Both silica and silicon have lattice structures.

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Silicosis - Wikipedia

Silicosis is a form of occupational lung disease caused by inhalation of crystalline silica dust. It is marked by inflammation and scarring in the form of nodular lesions in the upper lobes of the lungs.It is a type of pneumoconiosis. Silicosis (particularly the acute form) is characterized by shortness of breath, cough, fever, and cyanosis (bluish skin). It may often be misdiagnosed as ...

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Crystalline silica | definition of Crystalline silica by ...

([section])([section]) In a 2012 report from Israel, a 2014 report from Spain, and a 2015 report from the United States, silicosis has been documented among workers exposed to respirable crystalline silica dust during the fabrication and installation of quartz-containing engineered stone products used primarily for kitchen and bathroom countertops (4,7,8).

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Crystalline | Article about crystalline by The Free Dictionary

crystalline Like a crystal. It refers to a uniform atomic structure throughout the entire material. For example, the silicon in most integrated circuits is crystalline (see crystalline silicon).In phase change optical discs, the spots (bits) on the recording layer that are crystalline allow a greater reflection of the laser beam than do the amorphous spots, which have a random atomic structure.

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Silicon dioxide — Wikipedia Republished // WIKI 2

Silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with the chemical formula Si O 2, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic ...

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Cristobalite | definition of cristobalite by Medical ...

cristobalite: ( kris-tō'bă-līt ) Form of crystalline silica used in casting investments.

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Silicon dioxide - Academic Kids

It is manufactured in several forms including glass (in colorless high purity form called fused silica), synthetic amorphous silica and silica gel (used e.g. as desiccants in …

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Cristobalite | Article about cristobalite by The Free ...

Though considered a non-hazardous nuisance dust, amorphous precipitated silica can be transformed through traditional convective/conductive heating into crystalline forms such as cristobalite that are known respiratory hazards.

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Silicosis - definition of silicosis by The Free Dictionary

Define silicosis. silicosis synonyms, silicosis pronunciation, silicosis translation, English dictionary definition of silicosis. ... Encyclopedia; Tools. A; A; A; A; Language: ... Silicosis is a diffuse irreversible interstitial lung disease caused by continuous inhalation of crystalline silica (Si[O.sub.2]) leading to lung fibrosis (1). Rare ...

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Silicosis - ILO Encyclopaedia

Silicosis is an occupational lung disease attributable to the inhalation of silicon dioxide, commonly known as silica, in crystalline forms, usually as quartz, but also as other important crystalline forms of silica, for example, cristobalite and tridymite. These forms are also called "free silica" to …

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Diatomaceous earth Facts for Kids - Kiddle encyclopedia

Crystalline silica (silicon dioxide) poses a serious inhalation hazard because it can cause silicosis and can eventually lead to cancer. Amorphous silica can cause dusty lungs, but does not carry the same degree of risk as crystalline silica. Food-grade diatomaceous earth generally contains very low percentages of crystalline silica.

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Silicosis - ILO Encyclopaedia of Occupational Health and ...

Silicosis is a fibrotic disease of the lungs caused by the inhalation, retention and pulmonary reaction to crystalline silica. Despite knowledge of the cause of this disorder—respiratory exposures to silica containing dusts—this serious and potentially fatal occupational lung disease remains prevalent throughout the world.

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Crystalline silica synonyms, Crystalline silica antonyms ...

Synonyms for Crystalline silica in Free Thesaurus. Antonyms for Crystalline silica. 2 synonyms for silicon dioxide: silica, silicon oxide. What are synonyms for Crystalline silica?

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Chert | Encyclopedia.com

Chert is just one of the many types, or polymorphs, of quartz, a mineral composed of three-dimensionally bonded silicate tetrahedra. Chert is very fine-grained, so it does not occur as the 6-sided, prismatic crystals typical of such coarsely crystalline varieties of quartz as rock crystal, amethyst, smoky quartz and citrine. It does, however ...

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silica exposure Archives - Subsurface Construction Company LLC

Silica Exposure Control Programs in the Drilling Industry. We are all gaining familiarity with "Table 1. SPECIFIED EXPOSURE CONTROL METHODS WHEN WORKING WITH MATERIALS CONTAINING CRYSTALLINE SILICA" of OSHA's Crystalline Silica Rule for Construction – a title that kind of rolls right off the tongue. Table 1 was OSHA's attempt to guide contractors in reducing silica exposure …

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Silica - Ullmann's Encyclopedia of Industrial Chemistry ...

Author Information. 1. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, Bochum, Federal Republic of Germany. 2. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, Bochum, Federal Republic of Germany

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Silicon dioxide - WikiVisually

Silicon dioxide, also known as silica, silicic acid or silicic acid anydride is an oxide of silicon with the chemical formula Si O 2, most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand.Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and ...

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Silicosis: Am I At Risk? - Consumer HealthDay

 · Silica is the second most common mineral in the earth's crust and is a major component of sand, rock and mineral ores. When workers inhale the crystalline dust, it may start a chain reaction that ends in silicosis.

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Silica gel - Wikipedia

Silica gel is irritating to the respiratory tract and may cause irritation of the digestive tract, and dust from the beads may cause irritation to the skin and eyes, so precautions should be taken. Crystalline silica dust can cause silicosis, but synthetic amorphous silica gel is indurated so does not cause silicosis.

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Silica | Article about silica by The Free Dictionary

Crystalline silica is found in granite, sandstone, quartzite, various other rocks and sand. OSHA, NIOSH flag silica levels in manufactured stone production Rice husk is a hard material and is composed of lignin, cellulose, traces metals, and abundant of amorphous silica [1, 2].Since silica is used in many technological applications; therefore ...

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Crystalline silica | Article about Crystalline silica by ...

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.

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Difference Between Amorphous and Crystalline Solid ...

 · The key difference between amorphous and crystalline solid is that the crystalline solids have an ordered long-range arrangement of atoms or molecules within the structure, whereas the amorphous solids lack ordered long-range arrangement. We can classify solids into two as crystalline and amorphous depending on the atomic level arrangement.

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What Is Silica and How Can it Support Your Health?

 · Silica used in the food and beverage industry is safe to take orally. However, that doesn't mean that silica is always safe for humans. Silica actually comes in many forms — some safe, some not. Crystalline silica, a form that includes quartz, can be toxic if inhaled. Crystalline silica is found in rock, brick, and concrete.

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