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Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO 2, commonly found in nature as quartz. [5] [6] In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a synthetic product.
Silicon carbide whiskers – Simazine: 122-34-9 Sodium dimethyldithiocarbamate: 128-04-1 Sodium fluoroacetate: 62-74-8 Soots, tars, and mineral oils (untreated and mildly treated oils and used engine oils) – Spirodiclofen: 148477-71-8 Spironolactone: 52-01-7 Stanozolol: 10418-03-8 Sterigmatocystin: 10048-13-2 Streptomycin sulfate: 3810-74-0
Materials that will not burn under typical fire conditions (e.g., carbon tetrachloride, silicon dioxide, perfluorohexane, water), including intrinsically noncombustible materials such as concrete, stone, and sand. Materials that will not burn in air unless exposed to a temperature of 820 °C (1,500 °F) for more than 5 minutes.
Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum.
Precipitated silica is an amorphous form of silica (silicon dioxide, SiO 2); it is a white, powdery material. Precipitated silica is produced by precipitation from a solution containing silicate salts. The three main classes of amorphous silica are pyrogenic silica, precipitated silica and silica gel.
Aluminium silicate is a type of fibrous material made of aluminium oxide and silicon dioxide, (such materials are also called aluminosilicate fibres). These are glassy solid solutions rather than chemical compounds. The compositions are often described in terms of % weight of alumina, Al 2 O 3 and silica, SiO 2. Temperature resistance increases ...
This is a point of controversy, with Efrati warning, “The risks associated with uncontrolled air quality, potential contamination, and inadequate pressure far outweigh any potential benefits ...
Silicon tetrachloride is manufactured on a huge scale as a precursor to the production of pure silicon, silicon dioxide, and some silicon esters. [11] The silicon tetrahalides hydrolyse readily in water, unlike the carbon tetrahalides, again because of the larger size of the silicon atom rendering it more open to nucleophilic attack and the ...