Electronics Forum: cem-1 (Page 1 of 4)

Singulation of old CEM-1 material

Electronics Forum | Tue May 24 10:07:50 EDT 2011 | ck_the_flip

Does anyone have experience singulating CEM-1 substrates?

CEM1 PCB

Electronics Forum | Mon Aug 05 03:03:50 EDT 2002 | jkhiew

Hi all, I had some old stock of CEM1 pcb: a. How long & under what temp. condition shall I bake it to eliminate the trapped moisture ? b. Is the baking time & temp. different for 3 yrs old stock, 2yrs old stock & 6 month old stock ? c. For CEM1 pcb,

Re: Surface Mounting on Composite Epoxy Materials (CEM - 1)

Electronics Forum | Thu Jul 22 02:58:25 EDT 1999 | George Verboven (Process Engineer)

We are considering adding surface mount components to a board we currently produce. The board is made from CEM-1. Has anyone had any problems with surface mounting to this material? We use a glue/place/cure process. Thanks in advance,

FR-2 against CEM-1

Electronics Forum | Mon Sep 25 07:35:04 EDT 2000 | Mikel Rodriguez

Hello, We are using FR-2 in boards 15x10cm size, with SMD and thru hole components (about 100 SMD and 50 thru hole). We have some "rare" problems (flex cracks or caps, diodes, and so on). Would we improve something by using CEM-1 instead of FR-2?? Mo

Surface Mounting on Composite Epoxy Materials (CEM - 1)

Electronics Forum | Fri Jul 16 11:29:59 EDT 1999 | John Sims

We are considering adding surface mount components to a board we currently produce. The board is made from CEM-1. Has anyone had any problems with surface mounting to this material? We use a glue/place/cure process. Thanks in advance, John Sims

Depanalization of CEM-1

Electronics Forum | Tue Sep 05 05:18:20 EDT 2017 | ravnikar39

Dear, has anyone problem after the depanalization of CEM-1 like this (picture in link)? https://drive.google.com/file/d/0B40MYZvzPFWFNnd6ejZYT3k4aVE/view?usp=sharing https://drive.google.com/file/d/0B40MYZvzPFWFaklHQTAydXJ0WFk/view?usp=sharing Is

Re: Printed Circuit Board Material

Electronics Forum | Mon Oct 16 20:45:45 EDT 2000 | Dave F

Thanks Nance. So, your production process is: * Screen / dispense glue on secondary side * Place secondary side SMT components * Cure glue * Insert primary side PTH components * Wave secondary side Please tell us about: * Flux type and wave s

cem3

Electronics Forum | Fri Oct 05 09:15:23 EDT 2001 | Ben Bierlein

It is a PCB material that has a woven glass / epoxy internal core and glass veil surface. It is in between the paper materials (FR1,FR2 and CEM1) and FR-4 as far as strength and cost. It is available in HiCTI material for high power applications.

Singulation of old CEM-1 material

Electronics Forum | Thu Jun 02 15:21:18 EDT 2011 | davef

As long as it has been properly stored, we don't believe that old CEM will singulate any different than new CEM ... either should press well.

Re: Printed Circuit Board Material

Electronics Forum | Tue Oct 17 12:15:19 EDT 2000 | NLykus

Dave, Current process is Insert through hole components topside Dispense SMT glue Place SMT components bottom side Glue cure Insert 1 through hole component by hand Wave Wave temperature is 480oF Topside preheats in D.O.E ranged from 99oc to 108oC

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