prov:value
| - Examples of liquids which may be used as blowing agents include hydrocarbons, such as isopentane, pentane, hexane, heptane or octane; unsaturated hydrocarbons, such as pentene, 4-methyl pentene, hexene or petroleum ester fractions; ethers, such as diethyl ether; alcohols, such as methanol or ethanol; ketones, such as acetone or methyl ethyl ketone; and halogenated hydrocarbons, such as carbon tetr
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