My PCB does not require Solder Mask, what should I do?

Unlike the copper layer, the solder mask layer is negative. This means a solid object in the layer corresponds to a hole, or opening in the solder mask layer (an area without solder mask covering). Therefore, for a board that requires the surface to be fully covered with solder mask, the solder mask layer should look like this, an empty outline of the boards.



For boards that do not require solder mask at all (exposed traces and bare FR-4 substrate material), then the solder mask layer should be completely filled like this:


If your boards do not require solder mask, please do not exclude the solder mask layers from your upload. The solder mask layers are mandatory for all PCB orders. We will assume that you have forgotten to export them and ask you to re-upload your files.

Here is a PCB.


 If you want no solder mask in your PCB, you can draw the solder mask layer like this.


If you want your PCB all covered by solder mask, you can draw the solder mask layer like this.  
Tip: Please apply the outline to all layers when generating the gerber, if the solder mask layer has no pattern, it may cause error information in CAM software.



Fusion Technical Support

  1. What is Gerber file?
  2. What are the PCB panelization rules?
  3. How to generate the Gerber (manufacturing) files?
  4. What is the correct way to draw the silkscreen on the bottom side?
  5. My PCB does not require Solder Mask, what should I do?
  6. My PCB does not require Drill Holes, what should i do ?
  7. Which layer should I use in EAGLE for milling?
  8. What is the depth and width of the v-cuts/grooves?
  9. I don't want silkscreen on my PCBs, how can I proceed with a PCB Assembly order?
  10. What are the dimensions for Dielectric Separation thickness?
  11. What is the thickness of the inner copper layers?
  12. What are Blind and Buried Vias?
  13. What is the The Min Track/Spacing for 1oz./2oz./3oz. Copper weight
  14. What are Plated Half-Holes/Castellated Holes?
  15. How do I design non-plated through holes?
  16. What PCB materials are available in Seeed Fusion?
  17. What is the thickness of Fusion PCB?
  18. What PCB surface finishes are offered in Seeed Fusion?
  19. What color options are available for the solder mask/resist?
  20. What is the PCB copper weight?
  21. What is Impedance Control?
  22. PCB quantity
  23. How to generate Gerber files from PCBE
  24. How to generate Gerber and Drill files from Eagle
  25. How to generate Gerber files in Altium Designer
  26. How to generate Gerber files from CircuitMaker
  27. How to generate Gerber and drill files from KiCad
  28. How to generate Gerber files from DipTrace
  29. How to generate Gerber files from Proteus
  30. How to generate Gerber files from DesignSpark
  31. How to convert drilling layer from Gerber to Excellon format in CAM350
  32. Recommend size for BGA
  33. Solder Mask Dam
  34. What is the difference between Fusion standard PCB and Fusion Advanced PCB?
  35. What should I do if my Gerber files are too big (over 4MB)?

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