2021 Owens Corning Sustainability Report | Expanding Our Product Handprint | Product Innovation & Stewardship | 108 Managing Materials of Concern All our manufacturing facilities and the products manufactured under our control are guided by our efforts to manage materials of concern (MOC), including chemicals that are not necessarily regulated, but which we believe pose sufficient safety, environmental, or regulatory hazard to merit restrictions on their use. These efforts apply to the use of raw materials and other substances used to produce products across all business activities. This includes research and development (R&D), manufacturing, tolling operations, distribution, and materials used to maintain the site facility and equipment. In addition, companies that supply us with raw materials are expected to verify that all materials used in the manufacture of Owens Corning ® products or the sale of products to Owens Corning were sourced in compliance with all applicable environmental laws, regulations, and legal requirements, per our Supplier Code of Conduct. As part of our product stewardship review process, a list of materials of concern is published on our intranet, where it is frequently updated. By consulting with these guidelines, we can: ■ Control the use of chemicals, polymers, and other materials. ■ Comply with laws and regulations in the places where we make and sell our products. ■ Ensure our products are safe and sound to make, use, and dispose of. To ensure the identification and replacement of any regionally banned or future banned chemicals, all our businesses are required to comply with the MOC list in the development of new or significantly modified products. These guidelines apply to all our controlled domestic and foreign subsidiaries and all other legal entities in which Owens Corning has controlling interest (>50%). As stakeholders become more interested in understanding the chemical compositions of our products, our product sustainability team develops programs to address all product-related stakeholder questions and concerns. Some of our products contain ingredients that have been banned in some regions, usually on a timeline for discontinuance. Though we use comprehensive risk assessments to ensure all our products can be used without harm to people or the environment, we put a replacement plan into action whenever we learn of an ingredient ban or discontinuance requirement. Under this plan, we also evaluate the applicable product line and enable R&D to address material substitution. Red List Chemicals Many chemicals do not necessarily fall under regulatory restrictions in certain jurisdictions around the world, but green building rating system developers and architecture firms have flagged them as chemicals of potential concern. Our product stewardship team monitors these Red List chemicals and maintains an internal list that is consulted as new products are developed or existing products are modified. We recognize that customers seeking specific certifications are choosing products that do not feature chemicals that appear on that certifier’s Red List. Therefore, it is mutually beneficial both to us and the customer that we are fully transparent and voluntarily offer information about the chemicals used to make our products, including chemicals that appear on Red Lists. Fiber Safety Owens Corning has been a pioneer in the science of fiber safety, and we continue to provide industry-leading expertise. By engineering our continuous filament fibers to be too large to be inhaled, and by controlling the composition of the raw materials we use to make our insulation glass wool, we ensure that all our fiber-based products are safe to manufacture and use. Owens Corning has an internal product stewardship guideline regarding fibrous materials, which states the company will not knowingly manufacture or use any fiber or fiber-containing material unless the fibers are shown to be non-respirable or biosoluble, or unless use of the material generates insignificant exposure as shown by measurements in the manufacturing and end-use environments. Compliance with this guideline is verified during product stewardship reviews. The safety of Owens Corning insulation products is supported by a 2001 decision by the International Agency for Research on Cancer. In addition, the U.S. National Toxicology Program (NTP) removed soluble glass wool fibers from its list of substances “reasonably anticipated to be a human carcinogen.” The decision was released in 2012 in a report to the U.S. Congress. In 2011, soluble glass fibers were removed from the California Prop 65 list. Owens Corning mineral wool products were never listed by NTP or Prop 65. We perform regular composition audits to ensure the fibrous insulation products produced in our plants have the correct composition and are biosoluble. All continuous filament glass manufactured by Owens Corning is non-respirable. By the end of 2021, over 1,300 of our employees had taken our fiber safety online training, which was developed in 2018. As a result of this training, they have a better understanding of fiber health and our stance regarding the kind of glass fiber we produce and use.