* Polysorbate 20 (polyoxyethylene (20) sorbitan monolaurate) 
* Polysorbate 40 (polyoxyethylene (20) sorbitan monopalmitate) 
* Polysorbate 60 (polyoxyethylene (20) sorbitan monostearate) 
* Polysorbate 80 (polyoxyethylene (20) sorbitan monooleate)
The number following the polysorbate part is related to the type of major fatty acid associated with the molecule. Monolaurate is indicated by 20, monopalmitate is indicated by 40, monostearate by 60, and monooleate by 80. The number 20 following the polyoxyethylene part refers to the total number of oxyethylene (–CHCHO–) groups found in the molecule.