Electronics Forum | Wed Dec 13 13:42:57 EST 2000 | Mike Ihm
The dielectic absorption characteristic of printed circuit board materials is usually not listed on the manufacturers spec. sheets. Can anyone point me in a direction to help determine which laminate materials might exhibit better dielectric absorpt
Electronics Forum | Wed Dec 13 20:42:57 EST 2000 | Dave F
Material Dk @ 1GHz tan d @ 1GHz Difunctional 4.40 0.020 Multifunctional 4.43 0.018 Polyimide 4.06 0.006 Cyanate ester 3.65 0.005 Bismaleimide triazine 2.94 0.011 PPO-epoxy 3.85 0.012 PTFE-glass 2.60 0.001 PTFE-mat-CE 2.79 0.003 PTFE-ceramic 4.06 0.00
Electronics Forum | Wed Nov 09 10:25:09 EST 2005 | Amol
where in india are you laxman? and what kind of manufacturing are you involved in?
Electronics Forum | Wed Nov 09 02:24:49 EST 2005 | laxman
Hi Dave, Normally in our country (India) during rainy season the temperature will be 25to 30 �C and RH of 50 to 60%. The reason behind this humidity issue is that recently we have moved to our new facility with centralised air conditioner with Chill
Electronics Forum | Mon Nov 07 07:43:56 EST 2005 | pjc
No way I've ever heard to remove mositure from solderpaste. What is the R.H. in your factory? Are you in the tropics? Does you printer have an enclosed print area like on an automatic machine, or is it semi-automatic and exposed to the room air?
Electronics Forum | Tue Nov 08 20:51:41 EST 2005 | davef
Pete, the SF Bay Area gets very muggy this time of the year. Look here http://www.weather.com/weather/local/94110?lswe=94110&lwsa=WeatherLocalUndeclared&from=whatwhere
Electronics Forum | Wed Nov 09 07:46:58 EST 2005 | chunks
Hi Herb, Lexman, try a different paste to eliminate that question mark. Unless you're stuck with Kester, it's worth a couple hours of your time. I know of a couple SMT plants that run 40% to 50% humidity without any problems.
Electronics Forum | Wed Nov 09 22:03:33 EST 2005 | laxman
Hi Amol, We are in South part of India.basically we are basically EMS providercatering to the needs of our Overseas customer and partiallytodomestic market. We are also providing complete manufacturing solutions including cable harness, enclosure as
Electronics Forum | Mon Nov 07 08:27:56 EST 2005 | chunks
It could be you are drying out your solder paste. Most flux formulations are alcohol based and after a few hours can dry out. This can can lead to dewetting and solder balling as well. Especially if you do not homeplate your R's and C's. A simple
Electronics Forum | Mon Nov 07 06:16:59 EST 2005 | laxman
Hi, We have faced the solderability issue (Dewetting and solder balls)in all the Boards after reflow.When we found this issue we discarded the old paste and started using the new paste then for some hours the solderability found to be O.K. After so
