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Bis-PEG-8 vs. PEG-8 Dimethicone
Posted: June 3, 2008
Industry expert Tony O'Lenick explains: What is the difference between bis-PEG-8 and PEG-8 dimethicone?
The nomenclature related to what used to be called dimethicone copolyol has undergone a number of rule changes since 1999. Prior to 1999, all silicone compounds containing polyoxyethylene (PEG) or polyoxypropylene (PPG) groups, regardless of number, were referred to as dimethicone copolyol.
The rules have since changed. Under the first change, the number of moles of PEG and PPG were listed in the name. This results in the well-known PEG-8 dimethicone name.
The newer rules also differentiate between terminal and comb materials.