Highly Hazardous Chemicals as it applies to threshold quantity (TQ) of HHCs. | Occupational Safety and Health Administration
****!!!!****!!!*** "OSHA defines "commercial grade" as a typical maximum concentration of the chemical that is commercially available and shipped. The term "commercial grade" includes reagent grades, which, in some cases, will be in different concentrations from the typical commercial grades." "Chlorine Dioxide (ClO(2)), which is not commercially available and which is produced in a workplace process, the threshold quantity is determined not only by the free standing quantity of the HHC, for example, ClO(2) gas but also by the amount of HHC(s) in the mixture(s), for example, ClO(2) in a water solution. A process containing 150 pounds (68.00 kg) of ClO(2) gas and 900,000 pounds (408,231.00 kg) of ClO(2) water solution would be covered as follows. Assuming that the ClO(2) is 0.1 percent by weight of the water solution, there is 900 pounds (408.23 kg) of ClO(2) in the water solution. This process contains 150 + 900 or 1050 pounds (476.27 kg) of ClO(2) which is greater than the threshold quantity of 1000 pounds."