From: Debra Jacobson (firstname.lastname@example.org)
Date: Wed, 14 Aug 2002 06:39:28 -0500
Forwarded from the P2Tech listserv. There has been an interesting discussion about the subject of metals in printing ink.
Barium is also a RCRA metal, in addition to lead and chromium. Also, note that a chemical present at 1%, as some metals are in these inks, is still concentrated at 10,000 ppm! The hazardous waste toxicity characteristic metal concentrations are far less than 10,000 ppm! Chemicals that represent less than 1% by weight in a product formulation do not have to be listed on an MSDS and maybe up to 10,000 ppm in concentration! Be careful relying on percent by weight info and relating to hazardous waste concentrations...