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<p>[QUOTE=&quot;-jeffB, post: 3861054, member: 27832&quot;]Isn&#039;t that because it&#039;s really hard to separate all the xylene isomers (ortho, meta, para) from ethylbenzene, and because it doesn&#039;t really matter if you&#039;re just using it as a solvent?</p><p><br /></p><p>As for the others, IIRC purity is often specified in terms of <i>specific</i> impurities -- in other words, there might be a percent or two of other stuff mixed in that&#039;s unlikely to get in your way, but the things that would <i>really</i> interfere with normal usage are more tightly controlled. Of course, acetic acid is kind of a big deal for the acetone uses <i>we</i> have in mind, but I&#039;d think that would also be a problem for other applications (degreasing aluminum or galvanized steel, for example).[/QUOTE]</p><p><br /></p>

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