Re: PG vs PEG
They seem simular according the the MSDS for both, but there are differences.
Polyethylene glycol 400 MSDS
http://www.sciencelab.com/msds.php?msdsId=9926620
Chemical Formula: H(OCH2CH2)nOH
Propylene glycol MSDS
http://www.sciencelab.com/msds.php?msdsId=9927239
Chemical Formula: CH3CHOHCH2OH
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