Electronics Forum: past (Page 11 of 992)

Reusing Solder Paste

Electronics Forum | Fri Sep 13 14:21:49 EDT 2002 | blnorman

Run a test, but in our experience, yes you can reuse the paste. We ran tests on paste that was left on the stencil at the end of second shift, we put the paste back on the stencil the next day on first shift with no problems. You definitely want to

Reusing Solder Paste

Electronics Forum | Mon Sep 16 07:56:50 EDT 2002 | Yannick

Yes You can reuse solder paste, you simply don't put pback the use solder paste and the new one in the same jar, you don't refrigerate the old solder paste again. And before you begin to use the old solder paste be sure to mix it well. Good luck

BGA Rework - To Paste or Not to Paste (just Flux)

Electronics Forum | Fri May 07 12:02:28 EDT 2004 | Dreamsniper

From my understanding paste on BGA pads are applied only to help in holding the component as the PCB is conveyed during the manufacturing process then soldered. But during rework on BGA's do I have to apply Solder Paste or just Flux? What's the diffe

Solder Paste Expiry

Electronics Forum | Sat Nov 06 17:45:51 EST 2004 | Chunks

Depends mainly on your paste. Evaporation of alcohol/flux is your main concern. But most name brands last with no problem. What's "some time"? If it's hours, no problem - if it's days possible problems with evaporation -if it's weeks, just buy so

dry solder paste

Electronics Forum | Sun Feb 27 13:42:44 EST 2005 | pmdeuel

So true, We had paste flux supplied to us from Alpha metals. It was the same as used in the solder paste. The major problem we noted was the in ability to control the ratio of paste to flux resulting in lots of voids. When we mixed enough to get the

Use of solder paste after taking out from cold storage

Electronics Forum | Sat Nov 05 05:09:51 EST 2005 | ajay

we do keep out solder paste ready for next shift or for replenish. We specified a location to keep new paste ( only one container ) near stencil machine. As soon as that is use we put another container from freeze, we make sure that at specified loca

Air inclusion in solder paste

Electronics Forum | Mon Mar 27 21:09:29 EST 2006 | ms

Thanks Dave I'm not convinced the air is necessarily in the paste from manufacture - suspicious that it may be folding in during the change in direction of the print cycle - or as the paste travels across apertures. It is not necessarily in the fir

SAC solder balls reflow with Sn/Pb paste - Voids Issue

Electronics Forum | Wed Oct 04 14:14:49 EDT 2006 | russ

Change mfgrs of paste OR better yet use pbfree paste, If you are collapsing the balls on the BGA then you are possibly overheating the paste/flux quite a bit. most lead pastes do not like much more than 230 C. I am assuming that you have a decent p

Solder paste handing

Electronics Forum | Tue Jan 16 00:03:28 EST 2007 | Stephen- SMT engineer trainee

Thanks for you reply CL. For Q2, I want to know that is there are any ratio of mixing new or old soldering paste? Also, can we put the "working jar" and opened unused solder paste to refrigator and soft it by solder paste softer in next time of prod

Rohs and non rohs components on a board

Electronics Forum | Tue Feb 06 06:41:53 EST 2007 | pavel_murtishev

Good afternoon, You have to use lead paste since none-RoHS components won�t withstand elevated temperatures. Solder paste manufacturers offer a lot of transitional pastes designed specially for mixed process. Ask your paste supplier for transitional


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