Yes lots, your propective suppliers are probably as good as anywhere to start, have you
told them you are pin testing? Maybe you did and that's where the comment came from.
Anyway surprisingly, people do forget to mention this as they get taken up with paste
process details such as print and tack life and stuff but then do include it in their test
matrix. Also do your designers know? In this, our perfect world they will be able to
doodle lots of solderfree pads to test onto in the empty spaces all over your  pcb........
ho ho

To get back to your question: People tend to use resin and rosin interchangeably. If you
mean by rosin a natural resin, it is true that these can gum up probes. However some
manufactured resins can as well, whereas others will be formulated to shatter off when
probed and others to overcome the problem by being penetratable without shattering and so
on. Paste formulations based on rosins can be modified to adjust their physical post
reflow properties in similar ways.

Anyway I don't think you need to attach too much significance to semantics. Some so called
rosin based no clean formulations only contain rosin so as to be able say it on the label
for spec, marketing or comfort reasons. They also have synthetic resins just the same as
the resin resins if you're still with me. Go with what works in other words.

User experience is a great input here and I am amazed no one has come back. Maybe you need
to ask for people's experience product recommendations off line.

Mike Fenner
Bonding Services & Products
T: +44 1295 722992
F: +44 1295 720937


----- Original Message -----
From: Steffen, Don E <[log in to unmask]>
To: <[log in to unmask]>
Sent: 14 October 1999 12:24
Subject: [TN] Testability with rosin versus resin base paste?


> Techno's
>
> Has there been any studies done on the testability and penetrability of the
> rosin and/or resin based fluxes that is in No Clean paste?  We are qualifing
> two suppliers of No Clean Paste and one is rosin base and the other is resin
> base flux. I was told that the rosin base fluxes can become a real problem
> for the ICT test equipment. Let me know of your experiences.
>
> Donn E Steffen
> Senior Quality Engineer
> VDO Control Systems
> Auburn, IN 46706
> Phone (219)925-8887
> Fax (219)925-8710
> Email: [log in to unmask]

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