Electronics Forum: heat and curing and humiseal (Page 1 of 2)

Solder Balls and conformal coating

Electronics Forum | Fri Apr 05 15:24:14 EDT 2019 | sever_83

What can cause solder balls to appear after conformal coating? Using Dymax 9-20557, light curing for 1.5 mins. Can too much heat from light cure cause solder balls?

Cure Ovens and Cycle Interuption

Electronics Forum | Fri Dec 17 13:23:15 EST 1999 | Chris

I have an underfill material which takes 6 hours to cure. It works great, better than any other underfill I have ever used. A vertical cure oven is too expensive. I am currently using batch style ovens and opening the oven door as additional produ

SOT23s and paste + glue

Electronics Forum | Mon Dec 22 14:15:41 EST 2008 | ck_the_flip

As Emil says, it's 100% the glue! Your paste is not designed to hold parts on at wave solder. Reflow is MUCH hotter than glue, so I doubt you're not adequately heat-curing it. Possibly, the glue cure is "too hot" and maybe making the material brit

Re: Reflow glue and past.

Electronics Forum | Tue Feb 08 14:49:23 EST 2000 | Travis Slaughter

I have never tried this and wouldn�t really even want to consider it. Epoxy generally cures at around 160c in a fairly short amount of time, solder paste requires much more time and a peek temperature of about 210c or more in some cases. Curing you

seperation of soldermask and pcb

Electronics Forum | Wed Mar 19 08:38:13 EDT 2014 | davef

I can't picture much of what you're saying, not for nothing, I'm just not connecting. During assembly, solder mask can affected by heat and chemicals. Typically this would be during: * Soldering * Cleaning I will tell you this: Not to defend assem

seperation of soldermask and pcb

Electronics Forum | Tue Mar 25 13:55:05 EDT 2014 | horchak

Ok lets put it this way. If the PCB house used a high quality mask and properly applied it to a properly cleaned surface and properly cured it, then as Dave stated above there are only two things that can destroy it. Excessive heat and overly aggress

Electronic Assembly - PCB cleansing and COVID-19

Electronics Forum | Fri Apr 03 08:34:54 EDT 2020 | SMTA-Gregory

We need to be careful with product to avoid introducing a new failure mode, namely corrosion and dendrite growth, especially those running no clean processes! In addition to heat (reflow, wave and some selective soldering processes) killing the vi

Selective soldering pallets and solder balls

Electronics Forum | Thu Dec 05 11:36:30 EST 2002 | William Guatemala

Have you check the flux gravity lately? If not, Check the flux gravity every 6 hours to make sure proper parameters are meet. Here is a list of things that may cause your solder ball problems; Excecive heat, defective fixtures, preheating temperature

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Tue Apr 13 18:39:24 EDT 1999 | Tom B

Netters, When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? 1. Kester 293 no clean 2. 2.1 C/s for 30s to 150 C 3. .5 - .7 C/s f

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Tue Apr 13 23:08:56 EDT 1999 | Jeff Sanchez

Netters, When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? 1. Kester 293 no clean 2. 2.1 C/s for 30s to 150 C 3.

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