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Blowing agents are substances used to create cellular structures in materials like expanded polystyrene (EPS) by producing gas during the manufacturing process. Traditionally, chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and other halogenated compounds were commonly used as blowing agents. These substances, while effective ____ ___ ________ ______ ___ ________ ____.
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