| http://www.w3.org/ns/prov#value | - Furthermore, many other material requirements often exist for articles molded from plastics such as PPE. For example, the articles must exhibit very good flame retardancy; and the additive used to impart this characteristic must not cause other problems which have been associated with flame retardants in the past, such as cracking, or volatilization and condensation of the additive onto the articl
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