Question: I’d like to commend you for the great Q&A on your website. I have referred others to answers on HW and HM Qs over the years, as you always do a great job of explaining why something does/doesn’t apply.…
49 CFR 172.203(c): The Additional Description Requirement for a Hazardous Substance on a Shipping Paper
Add Desc 172.203(c) – Hazardous Substances
What is the PHMSA/USDOT Definition of a Hazardous Substance?
The PHMSA/USDOT definition of a hazardous material (HazMat) at 49 CFR 171.8 indicates that the term includes a Hazardous Substance. In other words, if a material meets the definition of a hazardous substance, then it is also a hazardous material…