| http://www.w3.org/ns/prov#value | - Flammable blowing agents such as pentane, butane and other organic materials may be used, but non-flammable, non-toxic, non-ozone depleting blowing agents such as hydrofluorocarbons (HFC), hydrochlorofluorocarbons (HCFC), and fully- or partially fluorinated ethers are preferred because they are easier to use, e.g., fewer environmental and safety concerns.
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