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Subject:	Re: Paste sit time
From:	Matthias Mansfeld <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 31 Jul 2002 11:12:46 +0200
Content-Type:	text/plain
Parts/Attachments:	text/plain (43 lines)

On 31 Jul 2002 at 16:26, Michael Bell wrote:

> Hi all,
>
> Has anybody got any idea on how long it takes for paste, that has been
> stenciled onto a PCB to start and degradate.  Our planning department
> is trying to suggest we use one printer to feed two lines and I have
> had little success in advising otherwise.  It would basically mean
> that pasted PCB's would sit for 10-60minutes before placement.  I have
> advised that this is a bad idea, but I just need some form of
> information to back this up.  Has anyone had any experiance in this???
>  Any information would be appreciated,

Maybe it is not totally what you want to hear, but: It depends. I
tried (for low volume stenciling or dispensing, prototyping /manual
p'n'p purposes) many pastes and ended with an Alpha paste RMA390D3K
which can without any problems sit a whole day and is tacky enough
and reflows fine (visually according IPC-A-610) even if itself is
(against all recommendations - I wouldn't do this with customer
stuff) two years outdated and the components have five year old
datecodes.

Regards
Matthias Mansfeld
-----------------------------------------------
Matthias Mansfeld Elektronik
* Printed Circuit Board Design and Assembly
Am Langhoelzl 11, D-85540 Haar, GERMANY
Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
E-Mail: [log in to unmask]
Internet: http://www.mansfeld-elektronik.de

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