Arch Chemicals, Inc. considers several factors when categorizing their chemicals as high priority chemicals for completing risk characterizations. Arch utilizes relevant available hazard information as well as information on potential exposure and risk associated with the use of each chemical by Arch and the associated value chain.

Factors that Arch considers for categorizing their chemicals as high priority:

Of primary importance:

• Chemicals with testing and/or risk evaluation work already completed or underway in response to current or impending regulatory scrutiny.
• Categories of chemicals of particular concern under national or regional regulatory programs; such as those listed as know carcinogens, mutagens, or substances that are toxic to reproduction.
• Chemicals with restricted uses or of particular concern under other international regulations or conventions.

Other relevant factors that may be considered include, but are not limited to:

• Whether the chemical could be classified as Persistent, Bioaccumulative, and Toxic (PBT).
• Whether and to what extent the chemical has potential for (significant) human exposure, especially when children and other sensitive subpopulations could be impacted.
• Whether and to what extent the chemical has a potential for significant environmental exposure when the chemicals are not regulated under a specific regime.
• Whether the chemical presents a significant acute hazard because it is highly flammable, corrosive, reactive, etc.
• Whether it is a high volume chemical.
• Whether and to what extent the chemical is a focus of increasing societal concern.
• Whether Arch wants to make a chemical high priority for business or other purposes (new product or existing product in a new application).