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May 1998

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Subject:
From:
Mark Gillan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 29 May 1998 13:32:00 +0000
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 ----------
From: Poulin, Michel
To: 'Mark Gillan'
Subject: RE: [TN] Properties of Probimer 52 Solde
Date: 29 May 1998 12:58


Mark,

     Very good summary.   So good that I've erase mty own answer...

     A quick question :

          We are looking to move from PR 52 91 to PR 52C.   You've
mentioned it will make finer resolution.    What can be really achieve
with PR52C and under which conditions ??

     Our experience of CSM is based upon a trial we conducted several months
     ago. The results showed an improved web perfomance with our current
     process for 52 with 91h. In reality I would expect 4thou webs to be the
     norm, and 2-3 thou achievable after adjustments to the process.

     Does it need a UV bump ?

     This will reduce exposure cycle time, I have been told by Ciba that a
     50% reduction is not unrealistic, but, I would like to see that in use.

     Does it need 12-15 C developer temp. ?

     No, we ran perfectly well with 16-18 C, it may help with 2-3 thou webs
though?

     Generally CSM performed better in a trial than standard 52. Long
     term evaluation however may highlight issues which dont appear in a
     trial.

Hope this helps and good luck.

Mark Gillan
Process Engineer
Prestwick Circuits Ltd,
Scotland UK.

Email: [log in to unmask]

> ----------
> From:   Mark Gillan[SMTP:[log in to unmask]]
> Reply To:    TechNet E-Mail Forum.;Mark Gillan
> Sent:   Friday, May 29, 1998 5:29 AM
> To:     [log in to unmask]
> Subject:     Re: [TN] Properties of Probimer 52 Solde
>
> The following is based soley on my experience of Soldermask
> Processing,
> please feel free to correct any inaccuracies.
>
> We currently process Soldermask using P52 with 91h  and aqueous
> systems,
> Taiyo,Carapace etc..
>
> The main differance is the base chemistry, Probimer 52 is epoxy based
> where
> Taiyo, Tamura etc. are aqueous based.
>
> Yes, P52 is normally curtain coated, it also requires specific
> chemistry for
> developing (4-Butyrolacetone) which is a one part solvent which can be
> recliamed to reduce costs. Aqueous systems can use a sodium carbonate
> solution which is much cheaper.
>
>  P52 has a "very" long exposure time up to 60 sec on 7kW ORC units,
> again
> aqueous systems require a lesser exposure time period on a 5kW lamp.
>
> Holding fine webs is also harder using P52, typically you will have to
> start
> adjusting exposure time v dev speed to achieve less than 6 thou webs.
> Taiyo
> will process 4 thou with only an increase in exposure time.
> Cure time for P52 is approx. 2 hours @ 150degC. Taiyo cures @ 150degC
> for 1
> hour.
>
> So why use P52?
>
> On the plus side assembly shops  are usually happy with the finish due
> to
> the resilient (hardness of 6+) and very matt finish (low to non
> existant
> solderballing). The electrical  breakdown voltage is typically higher
> than
> 3kV which customers producing High volatge boards like. Aqueous
> systems are
> about 0.5 to 2 kV in my experience.
>
> One other point is cost, our experience shows that P52 can be more
> expensive
> per sq foot than an aqueous system.
> If you are looking to intrduce P52, then I would recommend 52CSM as
> the
> solvent carrier is less toxic and finer webs are easier to attain.
>
> If you require further info please email direct.
>
> Mark Gillan
> Process Engineer
> Prestwick Circuits Ltd.
> Scotland UK.
>
> [log in to unmask]
>  ----------
> From: pacrim
> To: TechNet
> Subject: [TN] Properties of Probimer 52 Soldermas
> Date: 29 May 1998 07:27
>
> I am trying to determine the differences between Probimer-52 and other
> soldermasks (Tamura, Taiyo, etc.).  I understand that application
> techniques differ, as Probimer requires a curtain coating process,
> while
> the others can be sprayed, etc.  Are there significant differences
> between Probimer-52 and others?  If so, what are they?  Is one better
> then the other?  I am trying to make an argument for the changing to a
> more conventional S/M and any feedback would be greatly appreciated.
>
> Thanks for all of your help in advance.
>
> Best Regards
>
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