16-0704 v3.0/The Glenorchy MarketPlace, Stage 1 - Camp Glenorchy/Chromium in Stainless Steel
Chromium VI is included in the Red list and the following is mentioned on the ILFI web site :
Although chromium is a naturally occurring element and chromium III (trivalent chrome) is an essential nutrient, chromium VI (hexavalent chrome) can cause serious health issues........ Chromium VI is used primarily for chrome plating of metals for decorative or protective finishes, making stainless steel, leather tanning, anti-corrosive agents for paints, and in textile dyes and pigments...........REF: http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=61&tid=17
Following the link to the reference the following information is given :
The metal chromium, which is the chromium(0) form, is used for making steel. Chromium(VI) and chromium(III) are used for chrome plating, dyes and pigments, leather tanning, and wood preserving. This seems to contradict the 'Red list' information re use in making stainless steel.
My research on Hexavalent chromium advises that Chromium VI can be formed when performing "hot work" such as welding on stainless steel or melting chromium metal. In these situations the chromium is not originally hexavalent, but the high temperatures involved in the process result in oxidation that converts the chromium to a hexavalent state.
My question is in relation to the use of Stainless steel ....Please confirm that it is acceptable to use Stainless Steel products on the basis none of the 20 chemicals listed on the red list under Chromium VI are present in the ingredients .....ie we are not investigating the possibility of any Chromium VI being formed during manufacture due to 'hot work' .
When reporting ingredients for stainless steel products, teams only need to give the CAS number for stainless steel, not its individual components. Teams are not required to investigate the formation of any compounds as a result of process work on materials, but are required to investigate the composition of any coatings that are intentionally added to materials. See the "Metals" Clarification in the v3.0 Materials Petal Handbook (p. 10) for additional information.
Post ID 5711