| http://www.w3.org/ns/prov#value | - The organic pyropolymer precursors most commonly and preferably used are compounds of the group consisting of aliphatic hydrocarbons such as alkanes including ethane, propane, butane, etc; alkenes including ethylene, propylene, the isomeric butylenes; alkynes such as ethyne, propyne, 1-butyne, etc; aliphatic halogen derivatives such as chloromethane, bromomethane, carbon tetrachloride, chloroform,
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