In 2012, mintage numbers were reduced by over 90%, in line with a similar reduction for the Presidential Dollars, due to large stockpiles of unused dollar coins.he coin was first suggested as a replacement for the Susan B. Anthony dollar, which proved useful for vending machine operators and mass transit systems despite being unpopular with the public.
Butyl rubber is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for isobutylene isoprene rubber. Polyisobutylene, also known as PIB or polyisobutene, (C 4 H 8) n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based.
Butylene Glycol: Definition and Uses. Butylene Glycol is a chemical compound also known as 1,3-Butanediol. Like glycerin, Butylene Glycol (BG) is a humectant, a chemical that helps your skin (or other substances) retain moisture. It is also a solubilizer, which means it makes other substances (such as fat) more soluble in water. Like glycerin, it is a common ingredient in cosmetics. It is also a common ingredient in food.