Kevin , Ciba Specialty Chemical has the Probelec line of Dielectrics, and you can also get the negative version in a dry film as Vialux 81 from Dupont. Additionally Shipley, Amoco, and Enthone have PID materials. IBM is having a material made and it can be purchased with a license for use through Morton. The New IPC 4104 lists 3 dry film epoxy , 2 liquid epoxy, 1 Dry film epoxy. blend and 5 liquid epoxy blend materials in the Slashsheets. If you have any further questions please don't hesitate to contact me. Lastly , I can help you with information or facilitate running of samples with either the Ciba or Dupont materials if you would like , Russell L Smith Ciba Specialty Chemicals russell.smith @ cibasc.com 407-291-2333 ---------- From: [log in to unmask] To: [log in to unmask] Subject: [TN] Photo Definable Dielectric Suppliers Date: Wednesday, March 31, 1999 12:44PM Who are the suppliers of photo-definable dielectric materials for PWB based HDI circuit? Would these materials work for flex circuit? Many thanks in advance for your help. Kevin Chen 3M Corp. 651 737-9914 ################################################################ 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 ################################################################