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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 in forming lightweight EPS, have significant environmental and health hazards, which green chemistry principles aim to minimize or eliminate. One major _______ _____ _________ _________ _____ _____ ___ ________ ________ ______.
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