Topic: Black Soot like substance on Work

Hi Guys,

We have an intermittent issue that I am hoping that someone can shed some light on. We use a gas oven to PC and from time to time we get a black soot like substance after preheat that is like Tar when hot and then hard after cooling. We have been unable to figure out exactly what is causing it so as to eliminate it for good.

Any ideas?

Thank You!



Re: Black Soot like substance on Work

It sounds like built up powder that has become burned/charred.  Or, if you shoot multiple colors, perhaps it is a collection of all the residual powders combined.  Do you have a recirculation fan?  Have you cleaned it recently?  Ducting?

-Dustin Gebhardt, CEF

Advanced Manufacturing/Finishing Engineer


Sanford, NC


Re: Black Soot like substance on Work

If you have a conveyer line that runs through the oven check for oil buildup on the ceiling.