Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 80-08-0, Whether you call it 4-Aminophenyl Sulfone, 4 -4-Diaminodiphenyl Sulfone or 4 -4-Sulfonyldianiline you can be assured the 4-Aminophenyl Sulfone products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.