4-Nonylphenol (CAS: 104-40-5) is an alkylphenol with a nine-carbon chain para to the hydroxyl group. It is used as an intermediate for nonionic surfactants and resin modifiers.
It is practically insoluble in water and soluble in most organic solvents.
Because nonylphenol is regulated in some regions, buyers should check local restrictions before use.
It should be stored closed, away from oxidisers and heat. Typical specifications include assay by GC, colour, water and isomer content. Regulatory limits apply in some regions, so users should check compliance.