Polyphosphoric acid wani ruwa ne mai dankowa, marar launi zuwa kodadde ruwan rawaya tare da dabarar sinadarai Hn 2PnO3n 1, inda n yawanci tsakanin 10 zuwa 100. Yana da sinadarin inorganic kuma wani lokaci ana kiransa "super-phosphoric acid" saboda zuwa babban taro na kwayoyin phosphoric acid. An fi amfani da shi azaman mai kara kuzari ko reagent a cikin halayen sinadarai daban-daban, kamar wajen samar da zaruruwan roba da robobi. Ana kuma amfani da acid polyphosphoric wajen kera wanki, da kuma samar da magunguna da sinadarai na noma.