Electronics Forum | Mon Feb 14 21:28:22 EST 2000 | Dave F
Tobacco smoke is made up of "sidestream smoke" from the burning tip of the cigarette and "mainstream smoke" from the filter or mouth end. Tobacco smoke contains thousands of different chemicals which are released into the air as particles and gases.
Electronics Forum | Thu Jun 15 21:51:17 EDT 2000 | Dave F
Jeff: You're correct �7.1.3 of ANSI J-STD-001C states " Drying / Degreasing states the assembly may be treated to remove moisture and other volitiles." We don't bake "FR4" for love nor money. The archive are littered with threads along this line.
Electronics Forum | Mon Feb 05 06:57:52 EST 2001 | PeteC
Dason, IPC/EIA J-STD-001C states: "....temperature within the range of 230C (446F) to 290C (554C)." That's a pretty wide process range. 250C has been typical in the past. We run ours from 230C to 240C. We have found that some single-sided PCBs can de
Electronics Forum | Wed Apr 11 22:05:58 EDT 2001 | davef
OA pastes are more hydroscopic than NC pastes. Hydroscopic. The capacity of a material to absorb and retain moisture from the ambient air. Sometimes this is compounded if you remove paste from the frig and let it warm to room temperature, because
Electronics Forum | Fri Jun 01 16:22:35 EDT 2001 | davef
Your supplier�s approach to managing process change is TOTALLY UNACCEPTABLE!!!! Now, let me get the froth back in my mouth. How in the world do we know if the residues on these "no-clean" boards are compatible with your product? J-STD-001C, para 4
Electronics Forum | Tue Feb 01 21:48:12 EST 2000 | Dave F
Guo: You want to know: 1 Can I use water as the solvent in an ultrasonic machine to remove solder paste from PCB? Continuing from Jason�s comments: Sure you can use water as the solvent to remove solder paste from PCB, but recognize that some flu
Electronics Forum | Mon Aug 02 18:52:57 EDT 1999 | Graham Naisbitt
| Very shortly I will be evaluating OA flux and aqueous cleaning to replace our RMA and solvent cleaning process. I am primarily interested in batch aqueous cleaners for reasons of budget, floor space, etc. I am concerned about the ability of H2O t
Electronics Forum | Tue Jun 01 11:43:25 EDT 1999 | Dave F
| Hi, | | To improve the Design For Manufacturing I am currently looking to write down some design rules that can (and should be) used by our engineering department. | | Can somebody help me get started or give some usefull tips on where to find a
Electronics Forum | Tue Oct 13 18:28:51 EDT 1998 | Graham Naisbitt
Upinder, Using IPA does not cause the residue, it simply exposes it. Given that all fluxes leave reisdues, it follows that these MUST be benign - but how do you know, and how do you control it. You are using flux to remove oxides and give you a go
Electronics Forum | Fri Aug 21 14:38:00 EDT 1998 | Earl Moon
| It's been one hell of a week.... | From personal experience, what are the most common causes for embrittlement of the solder joint? I just need to make sure I've got all my bases covered. | thanks | -Ben Right on. Yago sangria. Chili conceso. That'
