Emulsifier(2-(2-(4-Nonylphenoxy)ethoxy)ethanol, FTRT NP-10, Nonylphenoxypoly(ethyleneoxy, Nonylphenol Ethoxylate)ethanol)  is a polyethylene oxide-type nonionic surfactant produced by the reaction of nonylphenol with ethylene oxide. Its chemical composition includes a hydrophobic nonylphenol group and a hydrophilic ethoxy chain, and it appears as a colorless transparent liquid. It is a non-ionic surfactant and an external spermicidal contraceptive, included in the United States Pharmacopeia 1990 XX11 edition. This product can alter the osmotic pressure of sperm, killing them or rendering them immotile so they cannot enter the cervical canal, thereby preventing fertilization and achieving contraception.

1. Moderately toxic by ingestion and skin contact.

2. A severe eye and mild skin irritant in humans.

3. Many glycol ethers cause dangerous human reproductive effects.

4. When heated to decomposition it emits acrid smoke and irritating fumes.

5. See also GLYCOL ETHERS.