organic PCB insulation

[bogdanfirst]

i am curious about how that organic insulation(the green, blue, brown and other colour thing on the pcb) is called ...
also, where to buy it from...??
has anyone ever used this for their PCB's??? how do you put it on the pcb and leave certain arreas uncovered.

 

[Nigel Goodwin]

i am curious about how that organic insulation(the green, blue, brown and other colour thing on the pcb) is called ...
also, where to buy it from...??
has anyone ever used this for their PCB's??? how do you put it on the pcb and leave certain arreas uncovered.

It's called 'resist' - I presume it's put on using a silk-screen printing method? - but no doubt there are people on here who actually know.

 

[bogdanfirst]

thanks for the name!!
i hope there is somebody that uses it here who can share the method.
does it come in different types?

 

[bmcculla]

I think its also called solder mask. PCBExpress.com will put it (and component silkscreen) on your boards for a bit more money. The boards I've gotten from then are very nice looking. They only have green though.

Brent

 

[bogdanfirst]

well.....not really intersted in the colour.
but how do you do it at home???

 

[Nigel Goodwin]

The main reason for it, is for commercial manufacturing - where they wave-solder all the board in one go - so it only solders where you want. If you are making a board at home, simply solder all the components in as normal, then spray a protective coating over the entire board - you can buy aerosol products for that very purpose.

 

[bogdanfirst]

but then can I unsolder the components???

 

[Nigel Goodwin]

but then can I unsolder the components???

If you ever need to you can simply scrape the resist off the joint you need to unsolder.

 

[hantto]

You can also just simply solder through the resist :þ

 

[Johnson777717]

Soldering through the resist gives a nice odor too. :roll:

Will the resist provide contamination and thus provide for easier "cold-solder" when desoldering and resoldering?

 

[bogdanfirst]

ok. here is what i want to do. i want to make a small PCB and then cover it into organic insulation, but leave the places where the connection is uncovered. how do i do that??
will it be possible to cover those places with some permanent marker and then spray the insulation? i will then clean the marker with acetone(hopefully not the insulation) and have the ability to solder just where the marker was layed.
the reason why i want to do this is because i get solder on the tracks where it shouldn't be, so i want to cover the tracks.

 

[bogdanfirst]

does anyone know any other name for the insulation?
when i search trough the products at the suppliers around here, for 'resist' i get all the resisors so searching trough that is quite nasty. any ideas?

 

[Nigel Goodwin]

ok. here is what i want to do. i want to make a small PCB and then cover it into organic insulation, but leave the places where the connection is uncovered. how do i do that??
will it be possible to cover those places with some permanent marker and then spray the insulation? i will then clean the marker with acetone(hopefully not the insulation) and have the ability to solder just where the marker was layed.
the reason why i want to do this is because i get solder on the tracks where it shouldn't be, so i want to cover the tracks.

Sorry if I'm being rude - but if you are getting solder where you don't want it, perhaps you should practice your soldering.

As I mentioned previously, it's done by commercial manufacturers for wave-soldering the boards, there's no need for it if manually soldering. You probably can't find anything about it because it's a process only done by PCB manufacturers.

As far as I'm aware, it's probably applied by a silk-screen process (like printing on the upper side of the board), applying something underneath most probably wouldn't work.

 

[mixos]

Here you will find a same topic:

After etching, what ???
https://www.electronics-lab.com/forum/index.php?board=21;action=display;threadid=192

Here are reported some product names also.