The Dodd‐Frank Wall Street Reform and Consumer Protection Act of 2010 and the United States Securitiesand Exchange Commission (SEC) now require U.S. public companies to report on the origin of mineralscommonly used in the electronics industry, specifically tin (Sn), tantalum (Ta), tungsten (W) and gold (Au).

These minerals are called conflict minerals because they are found in regions where forced labor and otherhuman rights abuses are used to mine these minerals and finance armed conflict, specifically in theDemocratic Republic of the Congo (DRC) and its adjoining countries. The goal of the rule is to motivatemanufacturers to ensure that these minerals come from conflict free sources and to prevent armed groupsfrom benefiting from the use of force and human rights abuses.

The following elements of our management system support the execution of the Carbo Conflict Minerals Program.

• Carbo only uses tin (Sn) as an alloy component for copper alloy products.
• Carbo is committed to sourcing responsibly and considers mining activities that fuel conflict asunacceptable.
• Carbo will continue to undertake reasonable due diligence within our supply chain to assure that tin(Sn) alloy material is not procured as a “Conflict Mineral.”