Solder Masks

What is it?
Solder mask or solder stop mask is a thin lacquer like layer of polymer that is applied to the copper traces of a circuit board for protection against oxidisation and to prevent solder bridges from forming between closely spaced solder pads.

What different types are there?
Top- and Bottom-side Masks A topside solder mask allows the electronic engineer to identify the openings in the green solder mask layer already added to the PCB by one of the epoxy, ink or film techniques. Component pins can then be soldered onto the board using those identified places

Epoxy Liquid Silkscreened onto the PCB pattern, epoxy liquid is the lowest cost type of solder mask. Epoxy is a thermosetting polymer that has many applications.

Liquid photoimageable solder mask is delivered as an ink formulation. The ink can be silkscreened or sprayed onto the PCB, then exposed to the pattern and developed.

Dry film photoimageable solder mask is applied using vacuum lamination, then exposed and developed. After developing, openings are created in the pattern and parts can be soldered to the copper pads. Copper is layered onto the board inside the holes and on the trace areas using electrochemical processing.

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Description Price Lead Free Peelable Package Size Package Type
RS Stock No. 561-549
Mfr. Part No.292959
BrandMulticore
SGD35.27
Each
units
Yes - 250ml Bottle
RS Stock No. 277-8222
Mfr. Part No.CM8E
SGD20.44
Each
units
Yes Yes 236ml Bottle
RS Stock No. 508-6403
Mfr. Part No.CLF8E
SGD24.42
Each
units
Yes Yes 250ml Bottle
RS Stock No. 547-348
Mfr. Part No.PM21 - FLACON DE 250CC
BrandMBO
SGD27.54
Each
units
- Yes 250cm³ Bottle
RS Stock No. 891-8814
Mfr. Part No.2211-8SQ
BrandTechspray
SGD18.46
Each
units
- - 227g Bottle
RS Stock No. 891-8817
Mfr. Part No.2211-G
BrandTechspray
SGD141.07
Each
units
- - 3.8L Container
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