| http://www.w3.org/ns/prov#value | - To maintain the stability of the boron carbide-phenolic polymer article made under severe operating conditions it is often considered to be important to limit the contents of halogen,mercury, lead and sulfur and compounds thereof, such as halides, in the final product and so of course, such materials, sometimes found present in impure phenolic resins, solvents, fillers and plasticizers, will be om
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