prov:value
| - Still other curing agents that may be used include the polycarboxylic acid anhydrides, such as, for example, pyromellitic anhydride, phthalic anhydride, succinic acid anhydride, maleic acid anhydride, boron trifiuoride and complexes of boron trifiuoride with amines, ethers, phenols and the like, Friedel-Crafts metal salts, such as aluminum chloride, zinc chloride, and other salts, such as zinc flu
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