Nonoxynols also known as nonaethylene glycol or polyethylene glycol nonyl phenyl ether (PEG) are mixtures of nonionic surfactants used as detergents, emulsifiers, wetting agents or defoaming agents. The most commonly discussed compound nonoxynol-9 is a spermatocide, formulated primarily as a component of vaginal foams and creams. Nonoxynol was found to metabolize into free nonylphenol when administered to lab animals.  Arkopal-N60, with on average 6 ethylene glycol units is a related used surfactant.
Nonoxynols are produced by ethoxylation of alkylphenols and vary in the number of repeating ethoxy (oxy-1,2-ethanediyl) groups resulting in Nonoxynol 4, Nonoxynol-7, Nonoxynol-9, Nonoxynol-14, Nonoxynol-15, Nonoxynol-18, Nonoxynol-30 and Nonoxynol-50. Other synonyms are polyethylene glycol (PEG)-7 Nonyl phenyl ether, PEG-14 Nonyl phenyl ether, PEG-18 Nonyl phenyl ether and PEG-50 Nonyl phenyl ether. The precursor nonylphenol is derived from phenol and a mixture of nonenes.
Nonoxynols have been used as detergents, emulsifiers and wetting agents in cometics, including hairproducts, and defoaming agents.Only nonoxynol-9 with 9 repeating ethoxy groups, has been used as a spermatocide, for vaginal foams and cream and on condoms.
Concerns about the environmental impact of these compounds has increased since the 1990s. These surfactants have a mild to medium estrogenic function. Consequently, this class of detergents has been effectively restricted for commercial "down-the-drain" applications in Europe, and these compounds are no longer used by U.S. laundry manufacturers.
A 2011 investigation found residual levels of nonylphenol ethoxylates in samples of clothing from 14 brands sold in the U.S., including Adidas, Uniqlo, Calvin Klein, H&M, Abercrombie & Fitch, Lacoste, Converse and Ralph Lauren. 
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