> What type of etching solution do you use ? I assume
> everything is plastic, including the nozzles. A 1,5hp pump
> definitely is a good size. I was thinking of using more like
> 1/4 hp centrifuge pump. to give 1,5 bar at 20 liters/minute.
> That should be enough for a single sided spray etch with
> sweeping spray nozzles. Does the spray oscillate in any way
> or is both the PCB and the spray stay still during the
> entire etching time ?
>
> I do not have any solder mask material yet. Does the
> soldermask you own work by photo imaging ? If so then does
> it also develop in 1% sodium carbonate ?
the pcb oscillate about 10 cm
10 nozzles per side makes 20 off it
volume off etch is about 25 liters
i use the fe3 the brown fluid.
the soldermask works the same way - only after developing extra uv
cure and after that an oven cure for 60 min at 159 C if you can get
the same film (dynachem laminar DM)
gr. Roel
i got lot off documents about the chems for plating and