I have always wanted to do this for my own use and over the pandemic, I took the time to compile a breakdown of some of the hazardous materials my clients have into Highly Toxic and Toxic so as to be clear which design requirements apply to which hazardous materials (HAZMATs). For some of these HAZMATs, I knew which level they belonged to as I work with them monthly, but there were a few surprises. Bear in mind that I worked for some world-class organizations early in my career and with some of these HAZMATs the business chose to manage them as “Highly Toxic” when in fact they were really only “toxic” or maybe not even “toxic”.
I used the median Lethal Concentration (LC50) to compile my lists and I ONLY broke down the thirty-two (32) hazardous materials that I have been asked about or worked with first hand during my career in industry (Chemical/Semi-Conductor) and as a consultant to a client.