Addition of Diisononyl Phthalate Category Proposed Rule
Rule Summary. In August 2025, EPA issued a supplemental proposed rule to add a Di-isononyl phthalate (DINP) category to the list of toxic chemicals subject to the Toxics Release Inventory (TRI) reporting requirements under the Emergency Planning and Community Right-to-Know Act (EPCRA) and the Pollution Prevention Act (PPA).
EPA Releases Proposed Rule Requiring TRI Reporting on DINP
DINP is a common chemical name for a family of di-ester phthalates widely used as plasticizers. These chemicals are colorless, oily liquids with high boiling points, low volatilities, and are poorly soluble in water. The treatment of plastics with DINP-category chemicals provides greater flexibility and softness to the final product.
Di-isononyl Phthalate (DINP); Final Scope of the Risk
EPA received six unique submissions for DINP, including comments from potentially affected businesses or trade associations, environmental and public health advocacy groups (some submissions were signed by more than one group), a group of state attorneys general, and one anonymous comment.
DINP Plasticizer Back in EPA’s Crosshairs | plasticstoday.com
A widely used phthalate in the plastics industry, DINP has been the subject of numerous health-related studies for many years. The EPA notes that studies have found that chronic dietary exposure to DINP induces liver and kidney tumors and leads to an elevated incidence of mononuclear cell leukemia (MNCL) in rats.
Diisononyl Phthalate (DINP) - OEHHA
Adoption of Amendment to Section 25705, Specific Regulatory Levels Posing No Significant Risk - Diisononyl Phthalate (DINP) Notice of a Public Hearing on a Request for a Safe Use Determination for Diisononyl Phthalate (DINP) in Certain Single-Ply Polyvinylchloride (PVC) Roofing Membrane Products
- What is the final use report for Di-isononyl phthalate (DINP)?
- Final use report for di-isononyl phthalate (DINP) - (1,2-benzene-dicarboxylic acid, 1,2-diisononyl ester, and 1,2-benzenedicarboxylic acid, di-C8-10-branched alkyl esters, C9-rich) (CASRN 28553-12-0 and 68515-48-0). (EPA-HQ-OPPT-2018-0436-0035).
- What is diisononyl phthalate (DINP)?
- PUBLIC RELEASE DRAFT May 2024 136 1 INTRODUCTION 137 Diisononyl phthalate (DINP) is an organic substance primarily used as a plasticizer in a wide variety of 138 consumer, commercial and industrial products ( 2021b).
- Do diets contaminated with bisphenol A and Di-isononyl phtalate modify skeletal muscle composition?
- P; Mylom ner-Piquer. I; Maradonna. F. (2019). Diets contaminated with Bisphenol A and Di-isononyl phtalate modify skeletal muscle composition: A new target for environmental pollutant action.
- Is DINP a hazard to benthic organisms?
- Acute Benthic Threshold: No definitive hazard values or concentrations of concern were identified from the studies of acute exposure of DINP on benthic organisms. Thus, EPA found no hazards from acute exposure of DINP to aquatic organisms living in benthic habitats.
- Is DINP a hazard to aquatic plants?
- Thus, EPA found no hazards from acute or chronic exposure of DINP to aquatic plants. Terrestrial Species Hazard Values Terrestrial Vertebrate Threshold: For terrestrial species exposed to DINP, EPA estimated hazard using a deterministic approach to calculate a TRV expressed as doses in units of mg/kg-bw/day (for mammals) (Figure 6-1).
- Does 437 DINP affect a general mammal?
- PUBLIC RELEASE DRAFT May 2024 436 conditions. EPA reviewed studies of laboratory rodents to derive a TRV of 139 mg/kg-bw/day dietary 437 DINP exposure. This TRV represents the potential chronic exposure dose at which the dietary effects of 438 DINP may affect a general mammal.
