
EPA Flags Unreasonable Risk from D4 in Industrial and Environmental Use
EPA draft risk evaluation finds octamethylcyclotetrasiloxane (D4) poses significant risks to workers and aquatic life, signalling regulatory change for industry.


The United States Environmental Protection Agency (EPA) has announced a proposed rule to address the health risks associated with C.I. Pigment Violet 29 (PV29), a chemical used in industrial applications such as paints, coatings, and printing inks. The regulation, revealed in December 2024, aims to mitigate the chemical’s lung toxicity risks through mandatory workplace protections, including respiratory gear and equipment cleaning protocols.
C.I. Pigment Violet 29 (PV29) is a perylene-based pigment recognised for its durability and stability in automotive paints, plastics, and industrial coatings. However, EPA’s 2021 risk evaluation identified potential lung toxicity from inhalation of its dry powder form, posing an unreasonable risk to workers.
To address these risks, the EPA's proposed rule under the Toxic Substances Control Act (TSCA) introduces several key safety requirements:
The EPA is encouraging feedback from businesses, workers, and other stakeholders. Comments can be submitted for 45 days following the rule's publication in the Federal Register. Specific input on compliance feasibility and the effectiveness of proposed measures is being sought.
To minimise the economic burden on small entities, EPA convened a Small Business Advocacy Review panel. Recommendations included tailoring requirements for entities not handling dry powder PV29 and allowing sufficient compliance timelines.
The EPA estimates the annual compliance cost to range from $1.6 million to $1.7 million over 15 years, largely due to expenses for personal protective equipment (PPE), cleaning supplies, and worker training.
The proposed rule aims to reduce chronic lung diseases linked to PV29 exposure, such as bronchitis. The monetised benefits of preventing such conditions are projected at $271,000 to $629,000 annually.
The EPA’s proposed rule underscores its commitment to worker safety while ensuring that industrial applications of PV29 can continue responsibly. Stakeholders are encouraged to provide insights that could shape the final regulation.
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