Is the issue bromine or halogens? PTFE also contains a halogen. Mike McMaster RF Product Engineer Merix Corporation 503-992-4263 > ---------- > From: Manfred Huschka[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;Manfred Huschka > Sent: Thursday, July 08, 1999 10:13 AM > To: [log in to unmask] > Subject: Re: [TN] FR4 Replacement > > The issue is revolving around the brominated flame retardant > Tetrabromobisphenol A, which the > resin manufacturers have to add to epoxy resin to achieve V-0 > flammabiliy rating. > Alternatives are based on phosphorous compounds. > > Most polyimides do not contain bromine, but as you indicate, > polyimides are several times as > expensive as FR4. For high-speed digital work you could use low cost > PTFE/woven glass base > materials, like RF-35 from Taconic, which are in the BT-Epoxy price > range. PTFE base > materials do not contain any flame retardant and are V-0 approved (due > to the fluorine in the > molecular structure). > > Manfred Huschka > Taconic > > ------------------------ > From: "Hollandsworth, Ron" <[log in to unmask]> > Subject: [TN] FR4 Replacement > Date: Thu, 8 Jul 1999 10:30:45 -0500 > To: [log in to unmask] > > > Hello TechNet > > I have observed tons of conversation on Lead Free issues and > speculation > which is great, however, I have a question concerning the replacement > of > board material. Specifically FR4. I have heard that there is concern > surrounding the flame retardant used in FR4 and therefore FR4 may have > to be > replaced by some other board material. Polyimide may be an option, > but what > will that do to cost. Is polyimide more expensive? Are there other > options? > > Ron Hollandsworth > Ops Task Leader AME Group > ITT > > > ---------------End of Original Message----------------- > > -------------------------------------------------------- > Manfred Huschka > Taconic Advanced Dielectric Division > Mullingar Business Park > Mullingar, Co. Westmeath > Republic of Ireland > > NEW MOBILE PHONE NO.: +353/87/2858528 > > Office until July 31/1999: PF 1275, D-51676 Wipperfuerth, Germany > Tel.: +49 2267 888004 > Fax: +49 2267 888005 > > after August 1/1999: Mullingar, Ireland > Tel. +353 44 34080 (direct) > Fax. +353 44 44369 > > E-mail: Manfred Huschka <[log in to unmask]> > Web: http://www.taconic-add.com > Date: 07/08/99 > Time: 18:13:01 > > Taconic is exhibiting at European Microwave Week in Munich (Germany) > October 5 - 7, 1999. We look forward to meet you on our stand no. 16A. > http://www.eumw.com > > This message was sent by Z-Mail Pro - from NetManage > NetManage - delivers Standards Based IntraNet Solutions > -------------------------------------------------------- >