Electronics Forum | Fri Jul 26 03:52:03 EDT 2013 | danyquintard
Hi We produce electronic pcboards for the aircraft industry. Some of our clients think that the thickness of the varnish left is proportional to the intensity of the blue color of uv's pigments in the varnish. Out off, we know that is not true. The
Electronics Forum | Mon Jun 09 17:39:06 EDT 2008 | jlawson
Shadow cure effects are dealt with by post cure mechanisims. New UV Coatings should have one, either heat or moisture cure. Basically UV primary cure starts off cure process, allows handling of the products. But UV is not suitable for all products
Electronics Forum | Thu Jun 05 05:27:13 EDT 2008 | andy1975
Hi, I've been looking into UV cureable conformal coating and the UV ovens but a chemist I know is very negative about this. He suggest by heating standard conformal coating to 90deg for a couple of minutes will make the product good enough to handle
Electronics Forum | Mon Feb 24 11:02:42 EST 2003 | Claude_Couture
Every time this problem was brought to me, handling was the problem. Make sure to: 1- track the exact place the components are lost, i.e.: visually inspect the pcb before and after each step in your assembly line. 2- if step one does not pin point t
Electronics Forum | Thu Jun 12 03:37:05 EDT 2008 | benefon
It is also possible to etch the barcodes directly on the PCB by using a laser. The solder resist mask is easily burned by laser and if there is copper underneath the contrast is quite good. The contrast is satisfactory even if there is no metal under
Electronics Forum | Tue Mar 30 07:20:20 EST 2004 | davef
If you can rub it off, it's unlikely to be a solder mask problem. Try the "excess flux, flux contamination, solder contamination" angle.
Electronics Forum | Thu Apr 05 11:43:35 EDT 2007 | Colleen
i just did a report on damaged boards from this kind of treatment. Components get rubbed off - sometimes the component just breaks, but often they take pad and track with them.
Electronics Forum | Fri Oct 06 15:12:17 EDT 2000 | Dave F
Alberto: Consider Dymax 911. It�s wave solderable and passes Cl ion, copper mirror, SIR, and electromigration tests. We have heard good things about Masterbond uV curables, but have not looked at them. 911 doesn�t cure very deep into the little d
Electronics Forum | Tue Mar 30 02:58:55 EST 2004 | Grant Petty
Hi, Thanks for the ideas. With the solder mask curing problems, can you normally wipe off the white residue, as we can do this on our boards with our fingers. It's almost like the surface of the board has a "wet dried up" look to it, and it's a smok
Electronics Forum | Mon Apr 14 20:13:40 EDT 2014 | davef
So, someone is going to get a chance to buy a nice and shiny oven, eh? Summary from my notes of old thread on SMTnet: Some people melt sugar and use that solution to clean cooked-on flux residue. Dissolve sugar into warm water, spray it on the area t
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