Electronics Forum | Fri Jul 23 05:14:40 EDT 2004 | greg york
Hi Thomas Ever considered that this maybe HASL flux left on PCB as this is extremely hygroscopic and has heat transfer fluids that cannot be baked out unless you go to a temperature of around 600C. One way of testing is to leave iron tip on joint an
Electronics Forum | Wed Aug 11 07:20:33 EDT 2004 | gregoryyork
HASL Fluids are generally not RA based fluxes. They are generally fluxes based on hydrochloric acid or hydrobromic acid or a mixture of the two, plus some very strong wetting agents that are very hygroscopic. Doesn't the residue of hydrochloric go wh
Electronics Forum | Thu Aug 12 13:34:03 EDT 2004 | gregoryyork
Yes unfortunately solder resist again, getting boring I know. That green stuff on the boards causes all kinds of problems if not applied correctly. Can't blame the flux (as usual) or the process as he has tried all varients to no avail and therosin s
Electronics Forum | Wed Sep 08 17:49:19 EDT 2004 | gregoryyork
Knock off some balls and you may find it has a flat bottom to it were it has mechanically stuck to the solder resist usually seen under 60X magnification. Common with Liquid photoimageable resist (I know again) Best way to check resist cure is to pay
Electronics Forum | Wed Mar 12 11:28:06 EDT 2008 | gregoryyork
Lead Free is probably worse as it contains something like 25% more flux by volume than Leaded. But is unusual as No Clean organics usually volatise off and rosins are non volatile so should not accumulate readily unless mixing with other gases in the
Electronics Forum | Fri Jul 31 09:12:35 EDT 2009 | gregoryyork
Dear Sean Contrary to believe MOST formulators of No Clean fluxes or No Residue fluxes use organic acides that are in fact weak and benign. IF the residue was left on the board and you had a condensing atmosphere then you may see some issue with fal
Electronics Forum | Tue Aug 04 17:37:43 EDT 2009 | gregoryyork
Im not sure that 0.004% is that critical in a solder alloy. If people are using our alloy and the Nickel increases we would most probably suggest running a dopant alloy without Nickel to bring the levels back down, it is very rare to require dumping
Electronics Forum | Wed Jan 18 17:07:32 EST 2006 | gregoryyork
Sorry Bob Could not respond been away busy. Just to correct you, we did not copy the SACX as we brought ours to market at least six months before so how could we copy, it is also a little different, but nicely reassuring when the 'big boys' do some
Electronics Forum | Tue Feb 07 13:39:42 EST 2006 | gregoryyork
You can use straight forward Tin/Copper but it flows very poorly so solderability is an issue. Dosing with Phos improves this but need to stay on top of it. We have supplied some 3.8%Ag alloys for flow they work well but you get a small 'chill point'
Electronics Forum | Thu Oct 23 09:49:18 EDT 2008 | davef
We're not sure the specifics that BLT Circuit Services Ltd referenced, but many companies use dross reducing agents in their wave solder pots. Among dross reducing agent suppliers: * Fry [4100 Sixth Ave, Altoona, PA 16602; 814-946-1611 F814-944-8094
Midwest Circuit Technology provides Carbide Router Bits and End Milling Cuters for use in PCB Depaneling equipment. We have over 35 years of supplying tools and machining experience in drilling, Routing, Test Fixture manufacture.
114 Barrington Town Square
Aurora, OH USA
Phone: 13309956900
