Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 131-18-0, Whether you call it Dipentyl Phthalate, Phthalic Acid Dipentyl Ester , DPP or Diamyl Phthalate you can be assured the Dipentyl Phthalate products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.