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.
Bisphenol A (BPA) is an industrial chemical used to make polycarbonate plastic resins, epoxy resins, and other products. Bisphenol A (BPA) is a chemical building block that is used primarily to make polycarbonate plastic and epoxy resins.Polycarbonate plastic is a lightweight, high-performance plastic that possesses a unique balance of toughness, optical clarity, high heat resistance, and excellent electrical resistance.o. According to U.S. Environmental Protection Agency records, bisphenol A (BPA) has not been used as an inert ingredient in pesticide products in the U.S. since at least 1994. BPA's status as an (inert) pesticide ingredient was recently rescinded by EPA, according to the June 11, 1999 Federal Register.