Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 9005-66-7, Whether you call it Polysorbate 40, Polyoxyethylene (20) Sorbitan Monopalmitate or Tween 40 you can be assured the Polysorbate 40 products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.