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Alternately, resin casting may be accomplished with a resin plus a nearly equal amount of a "hardener" liquid (as in many epoxy resin or polyester resin systems), which functionally contains a second polymer, for use in forming a final product plastic which is a copolymer. Copolymers contain two different alternating chemical entities in the ...
The reported Vickers and Knoop hardnesses were intermediate between diamond and c-BN, making the new phase the second hardest known material. [39] Ternary B–C–N phases can also be made using shock-compression synthesis. It was further suggested to extend the B–C–N system to quaternary compounds with silicon included. [9] [40]
Simon Fujiwara's A Spire (2015), in cast jesmonite, at the University of Leeds [1] [2] Jesmonite is a composite material used in fine arts, crafts, and construction. It consists of a gypsum-based material in an acrylic resin. It was invented in the United Kingdom in 1984 by Peter Hawkins. [3]
The Bakelite Company produced "transparent" cast resin (which did not include filler) for a small market during the 1910s and 1920s. [ 15 ] : 172–174 Blocks or rods of cast resin, also known as "artificial amber", were machined and carved to create items such as pipe stems , cigarette holders , and jewelry .
Epoxy resin, mixed with pigment, may be used as a painting medium, by pouring layers on top of each other to form a complete picture. [59] It is also used in jewelry, as a doming resin for decorations and labels, and in decoupage type applications for art, countertops, and tables. [60]
CVS Health's Caremark, Cigna's Express Scripts and UnitedHealth Group's Optum control the majority of the U.S. pharmacy benefit market, with their parent companies also operating health insurance ...