Section 721.10226 - Di-n-pentyl phthalate (DnPP)(a)Chemical substance and significant new uses subject to reporting.(1) The chemical substance identified as di-n-pentyl phthalate (DnPP) (1,2-benzenedicarboxylic acid, 1,2-dipentyl ester) (CAS No. 131-18-0) is subject to reporting under this section for the significant new uses described in paragraph (a)(2) of this section.(2) The significant new use is: Any use other than use as a chemical standard for analytical experiments. 79 FR 77911 , Dec. 29, 2014