RE: PCB marked for UL 94V-0
I would like to thank everyone for their responses. Once again, I see a demonstration of the expertise that exists in this forum. -doug From: POWELL, DOUG Sent: Thursday, June 19, 2003 10:48 AM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA ___ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc.
Re: PCB marked for UL 94V-0
In a message dated 6/19/2003 2:46:15 PM Eastern Standard Time, drcuthb...@micron.com writes: Doug, I believe that 94V-0 indicates that the board is self-extinguishing. How about lighting it with a flame, or a glowing PCB trace, and then remove the flame. The board fire should go out. Dave That won't tell you whether it's V-0 or not. All vertical rated boards (V-0, V-1, V-2) are self-extinguishing. To be a V-0 material, the laminate must self-extinguish in the vertical position without any flaming drip within a certain period of time under very controlled conditions including a calibrated flame size using a fixed caloric content burner fuel, etc. There's no way to self-test it and make a determination. UL does some elaborate fingerprinting and surveillance control on the materials, with the intention that manufacturers, along with UL end-product testing engineers, can rely on their plastics Follow-Up Service program for this very purpose. I also concur with Pete Tarver's remarks regarding the other conditions specific to printed wiring boards which may or may not affect the overall flammability performance of the finished board. Greg Galluccio Global Advantage International www.globaladvantage.ca This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: PCB marked for UL 94V-0
First of all I would update the note to say the board manufacturer must be a recognized printed wiring manufacturer, and then call out the flame rating you need on the board. You'll need the manufactures name or trademark, board model (single or multilayer), and the flame ratings stamped on the board. This is consistent with what UL requires for a recognized assembly anyway, so you aren't asking the vendor to do anything different for you than he has to do for any of their customers. That way you have UL running through their plant confirming their process and ratings. That will also give you some backhanded insurance that the board traces will stay on the board along with a host of other things checked by UL. There is no cost difference and you have bazillions of vendors to choose from. Just the flame rating itself can be a little hazardous because the flame rating of any material is dependent on the material thickness. Too thin and its no longer V0. Can the vendor still screw it all up - yes. But if you don't have any reasonable trust from them you shouldn't be using them anyway, unless you are going to test each and every lot that comes into the factor. Gary
RE: PCB marked for UL 94V-0
Bryan - The only required markings are manufacturer's name and type designation. Marking the flammability classification is optional. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com From: Cole, Bryan [LBRT/CCC] Sent: Thursday, June 19, 2003 12:46 PM Every PWB that is UL recognized needs to be stamped with the company name (or mark) and the style of marking of the rating, 94 V-2, 94 V-0, etc. Thanks, Bryan. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
All - For those not familiar with Greg Gallucio's background, he used to head up the plastics and printed wiring boards (PWBs) group at UL's Melville, NY, office (among other things). During my tenure at UL, I also did work in those two product categories; my wife spent many years working with them. There's more here than meets the eye. The UL Recognitions for PWBs control quite a few parameters about the finished boards, not just the finishes. Including, but not limited to: 1) each base laminate, by manufacturer's name and specific type designations (P/N, cat. no., what ever you want to call it). These can be either bare laminate with conductors added by the fab house, or they can be copper clad industrial laminates; they can be ceramics, flexible materials like polyimides or even more exotic. 2) the process steps used for temperature excursions above 100C and harsh chemicals, including etchants. 3) the finishes mentioned by John Barnes (though I'm not familiar with their controlling via or pad sizes) 4) any type of coating 5) conductive inks (carbon, silver, palladium, etc.) 6) marking inks covering more than a minimum % surface area 7) adhesives (commonly used for flexible and flex/rigid boards) It can be quite involved, though the concept is rather simple. However, I don't think Doug needs to worry about the base laminate flammability. As I stated previously, it's very unlikely that a V-0 rated board could use a laminate that would not also have that rating; one exception is if the fab house also made the laminate (cake from scratch, where you reap and winnow your own grain). Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
Doug, I believe that 94V-0 indicates that the board is self-extinguishing. How about lighting it with a flame, or a glowing PCB trace, and then remove the flame. The board fire should go out. Dave From: POWELL, DOUG [mailto:doug.pow...@aei.com] Sent: Thursday, June 19, 2003 10:48 AM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA ___ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc.
Re: PCB marked for UL 94V-0
In a message dated 6/19/2003 2:04:28 PM Eastern Standard Time, peter.tar...@sanmina-sci.com writes: Greg - My recollection of the FUS Procedures is that they checked the laminate's manufacturer and type designation, but not necessarily the flammability classification. Did that change before you left UL? No, but for ZPMV2 printed wiring boards, the mfgr's name and type designation cross-reference to the flame rating. It's an extra look-up step, but it's covered under the FUS surveillance. Greg Galluccio Global Advantage International www.globaladvantage.ca This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
There have been some good tips on checking UL compliance. Every PWB that is UL recognized needs to be stamped with the company name (or mark) and the style of marking of the rating, 94 V-2, 94 V-0, etc. One way that we check is by using UL's web site. Here is the link to where you can search on the company information. http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm We utilize this site extensively and it has proven vary valuable, not only for PWBs, but for all UL Listed or Recognized components. Thanks, Bryan. From: POWELL, DOUG [mailto:doug.pow...@aei.com] Sent: Thursday, June 19, 2003 12:48 PM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA ___ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc.
Re: PCB marked for UL 94V-0
Hi Doug: The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? I interpret your question as to how to determine whether or not a PCB is counterfeit or not. A UL-certified PCB would have the following markings: PCB manufacturer's indentification; manufacturer's grade designation; UR mark; flammability rating, e.g., V-0. So, it is not just a matter of the V-0 mark; all four marks must be included on the board. I suppose a vendor could counterfeit all four marks. If I had a suspect PCB, I would first confirm the PCB manufacturer and grade designation as being in the UL Yellow Book. If they are not in the Yellow Book, then that confirms that the PCB is counterfeit. If the marks are confirmed by the Yellow Book, then the problem of determining a counterfeit is much more difficult. Unfortunately, testing the board to V-0 requirements will not tell you if the board is V-0. The problem is that the copper traces provide effective heat-sinking for the board material such that even an HB material may pass the V-0 test! (I've actually tested an HB board where the HB material did not extinguish in 10 seconds or 30 seconds, but extinguished in less than 60 seconds!) The only way to confirm V-0 is to test a board with no copper. This means you must peel off the copper from a 1/2-inch by 5-inch section, and then test the section per UL 94. (You must also remove the solder resist.) You can't remove the copper and solder resist by chemical means as this may change the properties of the board material, and you would not be able to confirm the flammability rating. In my experience, I've never had occasion to suspect a PCB as being counterfeit. We've never bought a board from a non-UL vendor. While I suppose there are non-UL vendors, I suspect there are very few. Good luck! Best regards, Rich This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
94V test procedure: www.portplastics.com/download/pdf/plastics/ techspecs/techspecs24.pdf burn, baby, burn Dave Cuthbert Micron Technology From: Peter L. Tarver [mailto:peter.tar...@sanmina-sci.com] Sent: Thursday, June 19, 2003 12:30 PM To: EMC-PSTC (E-mail) Cc: POWELL, DOUG Subject: RE: PCB marked for UL 94V-0 Doug - Chances are very good, if the finished board is V-0, the base laminate would also be capable of V-0, even if not separately tested. The converse is not necessarily true. I've seen V-0 laminates not comply with V-2 requirements after particularly harsh fabrication processes or overstated MOTs. It's very unlikely that a base laminate that could not meet V-0 requirements would then meet V-0 as a finished board. I don't see any particular value in trying to validate the base laminates. Not only might the fab house use a wide array of suppliers and laminate cat. nos. for a given cat. no. board material, the lists expand and contract regularly and you'd have a big headache trying to jeep up with it. If you _must_ validate the base laminate, you'd have to work something out with the board vendor(s) and specify the materials they can use. UL does have a Recognition category for the base laminates: Polymeric Materials - Filament-wound Tubing, Industrial Laminates, Vulcanized Fiber, and Materials for Use in Fabricating Recognized Printed Wiring Boards - Component (QMTS2). A large number of copper clad industrial laminates and other laminates that may be clad by the fab house are included in this category. Laminate sheets may or may not be marked individually, but the paper or other wrapping for a bundle should be labeled, if the sheets are not. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of POWELL, DOUG Sent: Thursday, June 19, 2003 9:48 AM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
Got it now: http://www.portplastics.com/plastics/techSpecs/index.html and hit UL Test Procedures Dave Cuthbert From: drcuthbert Sent: Thursday, June 19, 2003 2:05 PM To: 'Peter L. Tarver'; EMC-PSTC (E-mail) Cc: POWELL, DOUG Subject: RE: PCB marked for UL 94V-0 94V test procedure: www.portplastics.com/download/pdf/plastics/ techspecs/techspecs24.pdf burn, baby, burn Dave Cuthbert Micron Technology From: Peter L. Tarver [mailto:peter.tar...@sanmina-sci.com] Sent: Thursday, June 19, 2003 12:30 PM To: EMC-PSTC (E-mail) Cc: POWELL, DOUG Subject: RE: PCB marked for UL 94V-0 Doug - Chances are very good, if the finished board is V-0, the base laminate would also be capable of V-0, even if not separately tested. The converse is not necessarily true. I've seen V-0 laminates not comply with V-2 requirements after particularly harsh fabrication processes or overstated MOTs. It's very unlikely that a base laminate that could not meet V-0 requirements would then meet V-0 as a finished board. I don't see any particular value in trying to validate the base laminates. Not only might the fab house use a wide array of suppliers and laminate cat. nos. for a given cat. no. board material, the lists expand and contract regularly and you'd have a big headache trying to jeep up with it. If you _must_ validate the base laminate, you'd have to work something out with the board vendor(s) and specify the materials they can use. UL does have a Recognition category for the base laminates: Polymeric Materials - Filament-wound Tubing, Industrial Laminates, Vulcanized Fiber, and Materials for Use in Fabricating Recognized Printed Wiring Boards - Component (QMTS2). A large number of copper clad industrial laminates and other laminates that may be clad by the fab house are included in this category. Laminate sheets may or may not be marked individually, but the paper or other wrapping for a bundle should be labeled, if the sheets are not. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of POWELL, DOUG Sent: Thursday, June 19, 2003 9:48 AM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
Doug - Chances are very good, if the finished board is V-0, the base laminate would also be capable of V-0, even if not separately tested. The converse is not necessarily true. I've seen V-0 laminates not comply with V-2 requirements after particularly harsh fabrication processes or overstated MOTs. It's very unlikely that a base laminate that could not meet V-0 requirements would then meet V-0 as a finished board. I don't see any particular value in trying to validate the base laminates. Not only might the fab house use a wide array of suppliers and laminate cat. nos. for a given cat. no. board material, the lists expand and contract regularly and you'd have a big headache trying to jeep up with it. If you _must_ validate the base laminate, you'd have to work something out with the board vendor(s) and specify the materials they can use. UL does have a Recognition category for the base laminates: Polymeric Materials - Filament-wound Tubing, Industrial Laminates, Vulcanized Fiber, and Materials for Use in Fabricating Recognized Printed Wiring Boards - Component (QMTS2). A large number of copper clad industrial laminates and other laminates that may be clad by the fab house are included in this category. Laminate sheets may or may not be marked individually, but the paper or other wrapping for a bundle should be labeled, if the sheets are not. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of POWELL, DOUG Sent: Thursday, June 19, 2003 9:48 AM To: EMC-PSTC (E-mail) Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: PCB marked for UL 94V-0
Greg - My recollection of the FUS Procedures is that they checked the laminate's manufacturer and type designation, but not necessarily the flammability classification. Did that change before you left UL? I note that the QMTS2 Guide Card only requires manufacturer's name and type designation. A quick check of a couple of laminates Recognitions shows Marking: Company name and material designation. Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA peter.tar...@sanmina-sci.com From: Greg Galluccio Sent: Thursday, June 19, 2003 10:26 AM If they leave the factory with a UR Mark on them, the UL inspector will be verifying the flame rating of the base material. Greg Galluccio This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: PCB marked for UL 94V-0
Doug, In researching the book that I am writing for Kluwer, Robust Electronic Design Reference, I ran across the following booklet: Lund, Preben, How to Design Printed Circuit Boards for UL Recognition. Westlake Village, CA: Bishop Graphics, 1983. In my manuscript, I discuss UL Recognition of PCB's on pages G-15 and G-16. Basically, a UL Recognition Card (Yellow Card) issued by UL to a printed circuit board (PCB) vendor covers: * The laminate, conductor, soldermask, surface finish, and legend materials to be used, and acceptable alternatives. * The vendor's manufacturing process. * The design rules to be followed, including: - Minimum trace width for Midboard Conductors. - Minimum trace width for Edge Conductors. - Minimum annular ring on vias and plated-through holes. - Maximum Unpierced Area. - Maximum operating temperature. - Minimum thicknesses for base laminate, C-stage laminates, B-stage laminates, and finished PCB's. - Conductor thickness. If you would like a deeper understanding of what a 94V-0 rating represents, I suggest you read Grand, Arthur F., and Wilkie, Charles A., Fire Retardancy of Polymeric Materials. New York: Marcel Dekker, 2000. John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE dBi Corporation http://www.dbicorporation.com/ This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
Re: PCB marked for UL 94V-0
Doug, do you mean the only the substrate or a PCB with the copper and soldermask in place? Regards, Lou Aiken, LaMer LLC 27109 Palmetto Drive Orange Beach, AL 36561 USA tel ++ 1 251 981 6786 fax ++ 1 251 981 3054 Cell ++ 1 251 979 4648 - Original Message - From: POWELL, mailto:doug.pow...@aei.com DOUG To: EMC-PSTC (E-mail) mailto:emc-p...@ieee.org Sent: Thursday, June 19, 2003 11:47 AM Subject: PCB marked for UL 94V-0 Hello group, An interesting question came up about validating printed circuit board raw material. In searching for alternate vendors we provide a spec that V-0 material is required and a UL V-0 stamp be placed on the board. The question is, how do I independently validate the material used, since a vendor could theoretically choose whatever they want and stamp it as V-0? -doug Douglas E. Powell Regulatory Compliance Engineer Advanced Energy Industries, Inc. Fort Collins, CO 80535 USA ___ This message, including any attachments, may contain information that is confidential and proprietary information of Advanced Energy Industries, Inc. The dissemination, distribution, use or copying of this message or any of its attachments is strictly prohibited without the express written consent of Advanced Energy Industries, Inc.
