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Mammoth have been made aware of a technical information bulletin released with respect to identification of Hexavalent Chromium (yellow power) detected on certain exhaust and heat shields on engines.
This yellow powder type appearance can be highlighted within the Image Group 1 (below).
Hexavalent chromium [Cr(VI)] is one of the valence states (+6) of the element chromium. Hexavalent chromium can be formed by chemical reaction when a base metal containing chromium (stainless steel) is in contact with a calcium based (anti-seize / lubricating agents used for exhaust mounting clamps & hardware / calcium-containing insulating medium), exposed to temperatures > 600°C.
For mobile plant and equipment, Cr(VI) deposits can be generated on engine exhaust componentry through (not limited to) the below methods;
NOTE: Mammoth Equipment and Exhaust products DO NOT CONTAIN calcium based thermal insulating products nor supply / install products with calcium based anti-seize lubricants.
If a yellowish substance is found, it should be assumed to contain Cr(VI) unless tested and determined otherwise. Mammoth Equipment and Exhausts recommend following relevant state and territory regulations and guidelines and your site Health and Safety Management Plan.
OSHA: https://www.osha.gov/Publications/OSHA-3373-hexavalent-chromium.pdf
OSHA Fact Sheet: Health Effects of Hexavalent Chromium