Electronics Forum: uv rubbing off (Page 1 of 6)

coating uv light inspection

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

Curing Conformal Coating

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

Curing Conformal Coating

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

Epoxied Parts Falling Off

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

Barcodes for PCBs - what systems?

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

PCB post reflow cleaning

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.

Piling/Stacking finished PCBs .......Sigh........

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.

Re: UV Epoxy

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

PCB post reflow cleaning

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

Cleaning old built up flux residues from reflow oven

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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