What's a 'heavy metal'? It depends whom you ask. (plastic colorants)

From: Plastics Technology | Date: June 1, 1993| Author: Monks, Richard | Copyright information

When processors or their customers ask colorant suppliers to "make mine heavy-metal free," the result is likely to be confusion on both sides. No one, you see, is quite sure what the expression means (see PT, Nov. '92, p. 78).

Depending on whom you speak to, the definition of a "heavy metal" can be as broad as every metallic element except lithium and sodium, or as limited as the few metals mentioned in the CONEG-type legislation (from the Coalition of Northeastern Gover...

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