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The same SAE system for designating motor oil viscosity also applies to synthetic oils. Synthetic oils are derived from either Group III, Group IV, or some Group V bases. Synthetics include classes of lubricants like synthetic esters (Group V) as well as "others" like GTL (methane gas-to-liquid) (Group III +) and polyalpha-olefins (Group IV ...
Synthetic oil is a lubricant consisting of chemical compounds that are artificially modified or synthesised. Synthetic oil is used as a substitute for petroleum-refined oils when operating in extreme temperature, in metal stamping to provide environmental and other benefits, and to lubricate pendulum clocks .
In 1933, SAE proposed 10W and 20W grades, [11] which saw popular use [18] despite never being formally adopted until 1950. [11] In 1950, the 10, 60, and 70 grades were dropped, new 5W, 10W, and 20W grades were added, and the testing criteria were simplified. The multi-grade labeling scheme was approved in 1955. The J300 identifier was attached ...
The materials includes latex, natural rubber, synthetic rubber and other polymeric materials, such as thermoplastic elastomers. Rubber processed through such methods are components of a wide range of items. Rubber products can be categorized into two main categories. Dry rubber products (dry form) Latex (wet rubber) products (liquid form)
In November 1999, a review of popular science websites in the Independent rated Sci Tech Daily as "the best science news site" at the time, with the caveat that it had a "perfunctory design"; the article described it as a links page that "culled the best science features, news stories and book reviews from dozens of science magazines, journals and newspapers."
The word tire is a short form of attire, from the idea that a wheel with a tire is a dressed wheel. [3] [4]Tyre is the oldest spelling, [5] and both tyre and tire were used during the 15th and 16th centuries.
Poly(methyl methacrylate) (PMMA) is a synthetic polymer derived from methyl methacrylate. It is a transparent thermoplastic , used as an engineering plastic . PMMA is also known as acrylic , acrylic glass , as well as by the trade names and brands Crylux , Hesalite , Plexiglas , Acrylite , Lucite , and Perspex , among several others ( see below ).
In industry, super-hydrophobic coatings are used in ultra-dry surface applications. The coating can be sprayed onto objects to make them waterproof. The spray is anti-corrosive and anti-icing; has cleaning capabilities; and can be used to protect circuits and grids. Superhydrophobic coatings have important applications in maritime industry ...
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