A: We have adopted a methodical approach to dust testing that starts with an explosive properties evaluation. This includes a functional group examination, small scale screening tests and oxygen balance/CHETAH calculations. At this point, dusts are either labeled not explosive or potentially explosive. The latter group are subjected to an explosivity analysis which includes DSC screening and UN sensitivity testing. Some of these potentially explosive dusts are then regrouped as not explosive.
Those that are significantly explosive cannot be immediately incorporated into your processes. Other options need to be considered such as:
- Subcontracting synthesis and handling to a third-party specialist;
- Handling the substance in diluted form so that its hazardous properties are reduced to an acceptable level;
- Or considering alternative substances.
Materials that are labeled not explosive may still create an appreciable fire or dust explosion risk. For this reason, they undergo further testing: a dust explosion screening, fire analysis and thermal stability screening .
