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<p>[QUOTE=&quot;Kentucky, post: 2649593, member: 33176&quot;]OK, Tommy, let&#039;s try this.&nbsp; Plastics used for plastic bags are made from the cheapest stuff they can get and this is polyethylene and polypropylene.&nbsp; These chemicals are inherently flexible and don&#039;t need any plasticizer added to make them flexible.&nbsp; An early plastic was polyvinylchloride, which made a hard, brittle plastic that was fine for irrigation tubing, but to use as lawn furniture webbing had to be flexibilized.&nbsp; The way to do this was to put into the mix a long molecule that would allow the polymer molecules to slide over each other...a plasticizer.&nbsp; PVC uses a lot of plasticizer because the plastic is so brittle.&nbsp; Polypropylene (Polypro) and polyethylene don&#039;t need any since there is little crosslinking and little attraction in the polymer strands.&nbsp; Polyethylene terephthalate (PET) doesn&#039;t need any and polystyrene doesn&#039;t use any (as far as I know) because the items made from it don&#039;t demand it. </p><p><br /></p><p>To have a colonoscopy (brrrrrrrr) you actually drink polyethylene glycol (PEG), the same stuff you find in diet shakes.&nbsp; As far as I know, McDonald&#039;s milkshakes or pure antifreeze won&#039;t make any polymer balls.[/QUOTE]</p><p><br /></p>

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