CH76: Sulfuric Acid reacts with polyethylene over timeCategory: Product Specific | Updated: 1/3/2007 2:26:32 PM | Owner: Donna M. Long | Read: 765 (Last: 9/7/2010 10:34:54 PM)DescriptionExplanation of the process and result of the reaction of sulfuric acid with polyethyleneAnswerPolyethylene containers are known to contain trace amounts of partially polymerized resin. The amount of partially polymerized resin is a function of resin quality and the container molding process. Concentrated sulfuric acid reacts with the partially polymerized resin in a two step process:1. Liquid oxidative degradation 2. Diffusion of the sulfuric acid into the polymeric matrix This reaction may cause a discoloration (darkening) of the sulfuric acid and an increase in substances reducing permanganate which tends to progress over time. A six month shelf life provides a conservative time frame in order to maintain the ACS and SEMI specifications for color and substances reducing permanganate.
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