Morton Electronic Materials does supply both Epic 200 SP LPI and
Conformask 2500 Series, Dynamask 5000 Series dry film solder masks.

>>> Nuchter_Wolfgang_(FV/FLT)_*
<[log in to unmask]> 09/25/98 06:25am >>>
Hi Matthew,
which company does suply LPISM and DFPISM ?

Regards
        Wolfgang Nuechter


> ----------
> Von:  Matthew Park[SMTP:[log in to unmask]]
> Antwort an:   TechNet E-Mail Forum.;Matthew Park
> Gesendet:     Donnerstag, 24. September 1998 17:13
> An:   [log in to unmask]
> Betreff:      Re: [TN] Help! Plugging vias
>
> Chiman!,
>
> What is the customer's purpose of plugging vias completely with
> solder mask?  I don't think it is possible.  Maybe some fab guru's
> can elaborate on it.
>
>  We tent all via holes from the bottom side to prevent solder
> pluggings during wavesoldering process.  It does a wonderful
> job with LPISM, even though holes are not plugged with
> soldermask.   Our via size is from 0.4 - 0.6mm.  If via is bigger
> than 0.7mm, it does plug the hole with solder sometimes.
>
> Try DFPISM (dry film), it does excellent job of tenting small and
> large vias with soldermask.
>
> regards
> Matthew S. Park
> NII Norsat International Inc.
>
>
> >>> Chi-man Chan <[log in to unmask]> September 24,
> 1998  2:59 am >>>
> Currently we have a big problem on plugging vias with solder
> resist. Our
> customer requires that vias must be completely filled with solder
> resist. (i.e. light cannot go through). The via size is 0.3-0.5 mm.
> We
> use liquid imageable solder resist. I have tried to print with 43T
> then
> 32T open screen wet on wet on both side of the board. It does
> not work.
> The vias seems to be blocked with resist after screen-printing.
> However,
> some vias open again after track dry and developing. I have
> reduced the
> thinner from 5% to 2%. It does not work and causes a lot of
> bubbles
> among tracks. In order to completely plug these vias, we now
> print these
> boards with dot pattern before solder resist  printing and after hot
> air
> solder leveling. Some vias are very close to SMD. It is a very hard
> and
> time-consuming job. I think there should be an easier way to do
> this
> job.
>
> Any feedback is appreciated.
>
>
> Regards,
>
> Chan Chi Man
> [log in to unmask]
>
>
################################################################
> TechNet E-Mail Forum provided as a free service by IPC using
> LISTSERV 1.8c
>
################################################################
> To subscribe/unsubscribe, send a message to
> [log in to unmask] with following text in the body:
> To subscribe:   SUBSCRIBE TechNet <your full name>
> To unsubscribe:   SIGNOFF TechNet
>
################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line
> Services" section for additional information.
> For technical support contact Hugo Scaramuzza at
> [log in to unmask] or 847-509-9700 ext.312
>
################################################################
>
>
################################################################
> TechNet E-Mail Forum provided as a free service by IPC using
LISTSERV 1.8c
>
################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe:   SUBSCRIBE TechNet <your full name>
> To unsubscribe:   SIGNOFF TechNet
>
################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
> section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or
> 847-509-9700 ext.312
>
################################################################
>

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV
1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services"
section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################