The duster vapors themselves do not produce much of a triboelectric charge. There isn’t a non-contaminating additive that can be added because it would just stay at the bottom of the can (the vapors are at the top, which are released when you open the valve).
The liquid propellant can produce a charge, and the plastic actuator can become charged as well. There are a few solutions to consider:
- Anti-Static Freeze Spray can be used upside-down as a duster. The vapor itself won’t be any different, but if the can is mistakenly turned, the liquid is much less likely to be charged.
- Vortex 360 is an invertible can, so it is designed to avoid spraying liquid regardless of how the can is turned.