silicone


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

silicone,

polymerpolymer
, chemical compound with high molecular weight consisting of a number of structural units linked together by covalent bonds (see chemical bond). The simple molecules that may become structural units are themselves called monomers; two monomers combine to form a dimer,
..... Click the link for more information.
 in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually stable at extreme temperatures (both high and low), may occur as liquids, rubbers, resins, or greases. Silicones are prepared from halides of organic silicon compounds by decomposition. Such compounds are chosen and used in mixtures that allow the desired molecular weight and degree of cross-linking to be obtained in the final polymer. Water repellent, chemically inert, and stable at extreme temperatures, silicones are used as protective coatings and electrical insulators and in caulk.

Implants consisting of silicone gel surrounded by hard silicone were used in reconstructive and cosmetic breast surgery until 1992. The safety of inserting silicone prostheses into the body was questioned in a large product-liability case involving breast implantsbreast implant,
saline- or silicone-filled prosthesis used after mastectomy as a part of the breast reconstruction process or used cosmetically to augment small breasts.
..... Click the link for more information.
, but an Institute of Medicine panel concluded in 1999 that there was no evidence linking such implants with cancer, autoimmune diseases, and other serious illnesses. The use of such silicone implants for reconstructive surgery and for cosmetic surgery has been again approved by the FDA since 1998 and 2006 respectively.

silicone

[′sil·ə‚kōn]
(materials)
A fluid, resin, or elastomer; can be a grease, a rubber, or a foamable powder; the group name for heat-stable, water-repellent, semiorganic polymers of organic radicals attached to the silicones, for example, dimethyl silicone; used in adhesives, cosmetics, and elastomers.

silicone

One of the family of polymeric materials in which the recurring chemical group contains silicon and oxygen atoms as links in the main chain; derived from silica and methyl chloride; characterized by resistance to heat and a low coefficient of thermal expansion.

silicone

Chem
a. any of a large class of polymeric synthetic materials that usually have resistance to temperature, water, and chemicals, and good insulating and lubricating properties, making them suitable for wide use as oils, water-repellents, resins, etc. Chemically they have alternate silicon and oxygen atoms with the silicon atoms bound to organic groups
b. (as modifier): silicone rubber

silicone

A material that is used to make lubricants, sealants, adhesives, gels, coatings and breast implants. Silicone (pronounced "sill-uh-kone") is a compound of silicon (pronounced "sill-uh-kin") and other materials. See silicon.
References in periodicals archive ?
The FDA claims that the use of injectable silicone can lead to infections, ongoing pain and serious injuries, which include scarring and permanent disfigurement.
announced plans to expand the production capacity of its Akron, Ohio plant, Shin-Etsu Silicones of America (SESA), which is engaged in the manufacturing and sales of silicones.
Silicones come in many processable forms, including liquid silicone rubber (LIM or LSR), heat cured rubber (HCE or HCR) and room temperature vulcanized rubber (RTV).
CHT Group said the combination of CHT Silicones and ICM Silicones doubles its current silicone business and will expand the variety of products and services that CHT already offers to the global marketplace.
Unlike conventional silicone emulsions, BELSIL DM 5700 E contains an emulsifying system that consists of an alkyl polyglucoside and sorbitan laurate.
A transparent matte gray plastic case is presented with one semi-transparent matte light blue strap at 12 o'clock, and one blue silicone strap at 6 o'clock.
Conclusion: Apart from other complications, raised intraocular pressure is a significant postoperative complication of eyes with silicone oil injection, so should be kept in mind because if not addressed properly it may lead to irreversible blindness in these cases.
With the high application in various industries Silicone fluids are available in different forms based on the intensity of application, those types being Silicone compounds, Silicone greases, Silicone pastes, Silicone anti friction coatings and Silicone dispersions.
Before installing the machine, talc was applied manually by hand to provide a non-stick surface to the finished silicone.
Silicone additives, in which a small amount of silicone is used (< 10%)
The motor vehicle segment is projected to provide the best growth opportunities, driven by substantial increases in vehicle output from relatively low 2011 levels, as well as by advancements in silicone technology aimed at improving vehicle safety and fuel efficiency.
Silicone technologies help improve the performance of ABS (anti-lock braking) and ESP (stability) systems.