
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 U.S. Environmental Protection Agency (EPA) has unveiled a new framework aimed at enhancing the assessment of eye irritation and corrosion in new chemicals. This initiative, embedded within the Toxic Substances Control Act (TSCA), marks a significant stride towards consistency in risk assessments, transparency, and ethical testing methodologies.
Traditionally, the assessment of new chemicals under TSCA mandates a rigorous review within a 30 to 90-day window, focusing on potential human and environmental hazards. A critical aspect of this evaluation is determining the likelihood of a chemical causing eye irritation or corrosion. Historically, this process has relied heavily on animal testing, particularly on rabbits, leading to inconsistent and ethically questionable outcomes.
Recognizing the limitations and moral concerns of traditional methods, the EPA's new framework introduces a paradigm shift. It places significant emphasis on non-animal test methods, which are not only more ethically sound but also yield results that are more relevant and applicable to human scenarios. This approach aligns with the EPA's commitment under TSCA to encourage alternative testing strategies that minimize or eliminate the need for animal testing.
The benefits of this innovative framework are manifold:
The EPA remains open to feedback and queries regarding this new framework. Interested parties can reach out to Renee Beardslee at beardslee.renee@epa.gov for more information or to express their views.
For an in-depth understanding of the Decision Framework for Hazard Identification of Eye Irritation and Corrosion, readers are encouraged to explore further resources provided by the EPA.
Framework to Assess Eye Irritation or Corrosion in New Chemicals
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