Pcb insulator

[goodguys]

Hi And thanks for reading this thread

What do you use as an electrical insulator for pcb solder pads.


I have a few solder pads very close together and want to insulate them to prevent a possible short. I am hoping there is a pen-like device which i can use to mark the pads, so when whatever is in the pen dries, it form a layer of insulation.

Thanks

 

[richie00boy]

You should leave the proper clearance when designing the pcb. If you are concerned about moisture causing tracking the area would have conformal coating applied. There are many types, use whatever you can get easily in small quantity.

 

[goodguys]

Hi. Been searching around but cannot find a pen type device for precise application.


Can you please recommend anything

 

[richie00boy]

There are no pen applicators for conformal coating. You will have to use a small artists brush. Unfortunately you may also have to buy a litre of the stufff.

 

[goodguys]

Thanks!


There appears to be two types, an acrylic resin and a silicon resin, is there any difference between the two types?
This is the one i am thinking of purchasing: APL15ML | Electrolube transparent 15 ml Can Conformal Coating for PCBs, -55 → +125 degC | RS Components

It is a small 15 ml brush type. Any opinions?

Thanks

 

[richie00boy]

That should be ok. I prefer acrylic myself as the silicone is rubbery but less aggressive if you have sensitive plastics onboard or require a thicker coating.

 

[JonSnell Electronic]

APL is acrylic.
https://uk.rs-online.com/web/p/conformal-coatings/3217324/

 

[nigelwright7557]

I use fibre washers.

 

[Mark Tillotson]

Hi. Been searching around but cannot find a pen type device for precise application.


Can you please recommend anything

Transparent nail-varnish used to be the favorite DIY conformal coating! I suspect it still is a perfectly viable approach, comes with handy applicator brush too.

 

[ferret]

Transparent nail-varnish used to be the favorite DIY conformal coating! I suspect it still is a perfectly viable approach, comes with handy applicator brush too.

+1