Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 496-72-0, Whether you call it 3,4-Diaminotoluene, 4-Methyl-o-phenylenediamine or 3 -4-Toluenediamine you can be assured the 3,4-Diaminotoluene products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.