Carlone, MIL-P-13949 went obsolete as of Nov. 30 1998. The replacement is IPC-4101. Also GFN is FR4. > Approved-By: [log in to unmask] > MIME-Version: 1.0 > Date: Wed, 24 Feb 1999 12:31:25 -0500 > From: Carlone Anthony C NPRI <[log in to unmask]> > Subject: [TN] FR4 PWB Material > To: [log in to unmask] > > Hello there, IPC/IPC Members! > > I work for the Naval Undersea Warfare Center (NUWC) in Newport, RI. My job > function involves the manufacture and acquisition of MK 48 ADCAP Torpedoes. > > > We're having failure problems with PWB's whose master dwgs specify core > material and prepreg material per MIL-P-13949, slash sheets 4 and 12. > Specifically, the dwgs require core material of GFN and prepreg material of > PGFN. However, the PWB supplier made the boards of "FR4" material. > > So, with that background, would somebody out there in the IPC world please > answer a couple of questions for us: > > 1. What is FR4, and what is the parent spec that addresses or controls it? > > 2. Are there any commercial (IPC or somebody else's) and/or military > performance specs that directly correlate with or directly substitute for > MIL-P-13949 slash sheets 4 and 12? > > Any help or guidance you can give us would be greatly appreciated! > > Thanks!! > > Tony Carlone > e-mail: [log in to unmask] > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 > ################################################################ > Regards, Jerry Schwartz, CID IPC Certified Interconnect Designer "May the Schwartz be with you" ################################################### # Jerry Schwartz,CID Designer 3 # # Harris Corporation GCSD Voice (407)-727-5474 # # P.O. Box 91000, MS 1/5852 Fax (407)-729-7540 # # Melbourne, FL 32902-9100 Pager (407)-690-9797 # # mailto:[log in to unmask] # # http://harris.com # ################################################### ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################