ASASP Analysis of ECHA RAC Opinion on the Proposed Harmonised Classification of SAS

The RAC Opinion on Synthetic Amorphous Silica (SAS) exhibits significant inconsistencies that compromise its scientific and regulatory integrity. Accurate substance identity is a prerequisite for hazard classification under CLP. Additionally, scientific evidence shows that rats are unsuitable models for assessing human inhalation risks, and that ROS formation is driven by macrophage physiology rather than silanol chemistry.

The challenges highlighted in this assessment illustrate the broader complexities inherent in evaluating particulate materials within the CLP framework. Existing data requirements for substances may not consistently provide a robust basis for assessing particulate materials. This underlines the necessity of initiating a comprehensive methodological review to ensure that assessments of particulate materials are conducted using scientifically rigorous criteria tailored to their distinct properties. It is essential to address these key concerns prior to advancing any classification efforts.