Homebrew PCBs

Anyone know of source of Cheap Photoresist Film?

My last purchase on ebay was poor in quality and high priced...

Thanks in advance...

--- In Homebrew_PCBs@yahoogroups.com, "krisfr" <krisfr@...> wrote:
>
> Anyone know of source of Cheap Photoresist Film?
> 
> My last purchase on ebay was poor in quality and high priced...
> 
> Thanks in advance...
>


I don't know about cheap but I bought the cheapest I could find at the time: http://www.ebay.com/itm/320735055777

So far it's worked well for me. Haven't tried anything highly detailed though but I don't see why it wouldn't work.

I develop it with washing soda, which is much cheaper than the stuff they want to sell to you.

I use laser-printed artwork on a transparency sheet and expose with UV LEDs through a sheet of glass. Darken the toner with a whiteboard marker as suggested here.


Of course, they may have changed their stock since I bought from them.

That, the link you show here, is the company I had the poor results with. One of the plastic sheet, on both side of the resist, was wrinkled and for my application the sheets were too small. I used transperent media and doubled the images. I had four layers, two for each side of the board. The results were about 70 percent of what I was looking for, but I  was not expecting perfection either. I have some coming from Europe. I will update this later. The cost for me is just too high for the small amount of product. 

Thanks for your input...

--- In Homebrew_PCBs@yahoogroups.com, "tda7000" <Tda7000@...> wrote:

>
> --- In Homebrew_PCBs@yahoogroups.com, "krisfr" <krisfr@> wrote:
> >
> > Anyone know of source of Cheap Photoresist Film?
> > 
> > My last purchase on ebay was poor in quality and high priced...
> > 
> > Thanks in advance...
> >
> 
> 
> I don't know about cheap but I bought the cheapest I could find at the time: http://www.ebay.com/itm/320735055777
> 
> So far it's worked well for me. Haven't tried anything highly detailed though but I don't see why it wouldn't work.
> 
> I develop it with washing soda, which is much cheaper than the stuff they want to sell to you.
> 
> I use laser-printed artwork on a transparency sheet and expose with UV LEDs through a sheet of glass. Darken the toner with a whiteboard marker as suggested here.
> 
> 
> Of course, they may have changed their stock since I bought from them.
>

I guess it's not the highest quality but it does work. Yes there are some wrinkles on my sheets too (but only on the edges) and I am not using the full size anyway. I just try to cut it so any wrinkles etc end up in a big copper fill and I can touch it up any holes with a Dalo pen afterwards. It's quite easy to touch up wider tracks as well.

For me it was more of an experiment to see how well UV LEDs worked, and if I had a good way to make the artwork\mask, which is why I chose  the cheapest.

As it turned out it's been pretty good so far, better than I expected so I'm happy with it, because I can make double-sided boards much easier now.

I can see though if you were expecting a perfect roll like something in their photo you would be less than impressed.



--- In Homebrew_PCBs@yahoogroups.com, "krisfr" <krisfr@...> wrote:

>
> That, the link you show here, is the company I had the poor results with. One of the plastic sheet, on both side of the resist, was wrinkled and for my application the sheets were too small. I used transperent media and doubled the images. I had four layers, two for each side of the board. The results were about 70 percent of what I was looking for, but I  was not expecting perfection either. I have some coming from Europe. I will update this later. The cost for me is just too high for the small amount of product. 
> 
> Thanks for your input...
> 
> --- In Homebrew_PCBs@yahoogroups.com, "tda7000" <Tda7000@> wrote:
> >
> > --- In Homebrew_PCBs@yahoogroups.com, "krisfr" <krisfr@> wrote:
> > >
> > > Anyone know of source of Cheap Photoresist Film?
> > > 
> > > My last purchase on ebay was poor in quality and high priced...
> > > 
> > > Thanks in advance...
> > >
> > 
> > 
> > I don't know about cheap but I bought the cheapest I could find at the time: http://www.ebay.com/itm/320735055777
> > 
> > So far it's worked well for me. Haven't tried anything highly detailed though but I don't see why it wouldn't work.
> > 
> > I develop it with washing soda, which is much cheaper than the stuff they want to sell to you.
> > 
> > I use laser-printed artwork on a transparency sheet and expose with UV LEDs through a sheet of glass. Darken the toner with a whiteboard marker as suggested here.
> > 
> > 
> > Of course, they may have changed their stock since I bought from them.
> >
>

I just ordered a second batch of DuPont Riston MM540 (38 micron):

http://www.ebay.com/itm/170869878820

from eBay seller gaminn:

http://myworld.ebay.com/gaminn/

I got a roll 318mm wide and 2 metres long for $17 including shipping
from the Czech Republic.  The price may have gone up and it seems he has
no more available.  Hopefully he will have more in the future.

This eBay seller in Sweden:

http://myworld.ebay.com/karass/

has 15 micron Riston FX515, again for an inexpensive price including
shipping.

The MM540 worked well for me.  An advantage of buying this, compared to
some unidentified photoresist, is that there is full documentation.  The
main page is:

http://www2.dupont.com/Imaging_Materials/en_US/products/dryfilmPhotoresist/index.html

This page:

http://www2.dupont.com/Imaging_Materials/en_US/tech_info/datasheets/index.html

has the Riston_GeneralProcessingGuide.pdf and datasheets for specific
types of Riston.

I may try the 15 micron material in the future.

 - Robin          http://www.firstpr.com.au/pcb-diy/

I have DuPont dry film photoresist on hand if anyone needs some. I use it in a DuPont HRL-24 hot roll laminator so I can supply laminated FR-4 panels as well. When used with the proper exposing films, light source and development cycle you can expect fast processing with almost zero defects.

Tom


--- In Homebrew_PCBs@yahoogroups.com, "krisfr" <krisfr@...> wrote:

>
> Anyone know of source of Cheap Photoresist Film?
> 
> My last purchase on ebay was poor in quality and high priced...
> 
> Thanks in advance...
>

Yes, this is the company that I ordered from too.

They have increased their price also.

I will hope for the best and see what happens. 

I ordered some of their developer too.


Thanks

--- In Homebrew_PCBs@yahoogroups.com, Robin Whittle <rw@...> wrote:

>
> I just ordered a second batch of DuPont Riston MM540 (38 micron):
> 
> http://www.ebay.com/itm/170869878820
> 
> from eBay seller gaminn:
> 
> http://myworld.ebay.com/gaminn/
> 
> I got a roll 318mm wide and 2 metres long for $17 including shipping
> from the Czech Republic.  The price may have gone up and it seems he has
> no more available.  Hopefully he will have more in the future.
> 
> This eBay seller in Sweden:
> 
> http://myworld.ebay.com/karass/
> 
> has 15 micron Riston FX515, again for an inexpensive price including
> shipping.
> 
> The MM540 worked well for me.  An advantage of buying this, compared to
> some unidentified photoresist, is that there is full documentation.  The
> main page is:
> 
> http://www2.dupont.com/Imaging_Materials/en_US/products/dryfilmPhotoresist/index.html
> 
> This page:
> 
> http://www2.dupont.com/Imaging_Materials/en_US/tech_info/datasheets/index.html
> 
> has the Riston_GeneralProcessingGuide.pdf and datasheets for specific
> types of Riston.
> 
> I may try the 15 micron material in the future.
> 
>  - Robin          http://www.firstpr.com.au/pcb-diy/
>

Hi Tom,

Can you tell us what type of Riston you have and where you live?

  - Robin         http://www.firstpr.com.au/pcb-diy/