Mike - Recommend you contact Erik Bergum at Polyclad Laminates (603)934-5642. Erik is the chairman of IPC 3-11 Laminate and prepreg materials subcommittee and the major mover behind IPC-4101. Regards - Kelly -----Original Message----- From: Hiteshew, Michael <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Monday, December 06, 1999 11:47 AM Subject: Re: [TN] Fungicidal Laminate Kelly We took your recommendation and looked at IPC-4101, table 5. However, our interpretation is a little different from yours. We interpret table 5 as a qualifying table. That is, in order to be qualified to IPC-4101, a vendor must demonstrate they can produce material to all the listed requirements. That's not saying that all material meets those requirements by default. In addition, a look through the individual specification sheets will show that fungus resistance does not appear (on any that I can find). This reinforces our belief that fungus resistance is a special requirement that must be specified in addition to the base material. I'd be interested in hearing from material and pwb manufacturers on this. -Mike > ---------- > From: Kelly M. Schriver[SMTP:[log in to unmask]] > Sent: Monday, December 06, 1999 7:36 AM > To: TechNet E-Mail Forum.; Hiteshew, Michael > Subject: Re: Re: [TN] Fungicidal Laminate > > Michael - > > I think what Doug is trying to point out is that the requirement for > fungus > resistance is already posted in the laminate material specification in > most > cases (ref. IPC-4101 table 5) as a part of the basic resin system > qualification. Accordingly, an additional requirement stipulated in the > purchase order would not be required, and may only cloud the issue by > imposition of additional specifications. > > Regards - Kelly > -----Original Message----- > From: Hiteshew, Michael <[log in to unmask]> > To: [log in to unmask] <[log in to unmask]> > Date: Friday, December 03, 1999 4:42 PM > Subject: Re: [TN] Fungicidal Laminate > > > Hi Doug, > We've been discussing this same issue here at Lockheed. According > to > IPC-6012 (Qualification and Performance Specification for Rigid Printed > Boards) - Section 3.11 (p17), "Special Requirements", reads in part: > "When specified on the procurement documentation, some or all of > the > special requirements listed in the following paragraphs shall apply. ...". > Section 3.11.3, which follows this statement, covers fungus resistance. > Notice the key words "When specified..". This qualifying comment occurs > again in Appendix A (p27). In addition, MIL-HDBK-454, Section 4.4, "Fungus > Testing", reads in part: > "Group II materials should be subjected to the fungus test > specified > in MIL-STD-810...". Under Group II materials are epoxy glass-fiber > laminates > and epoxy resin. Also listed is polyurethane, the main component in Type > UR > conformal coating. Type AR (acrylic) is listed as a Group I (fungus inert) > material. > So it sounds like these organic materials are fungus nutrients > and, > depending on your application environment, may need to treated with > fungicide. Since this is a special requirement, it will need to specified > on > the procurement documentation. > > Michael Hiteshew > Lockheed Martin Launching Systems > [log in to unmask] > (410) 682-1259 > > > > ---------- > > From: Douglas O. Pauls[SMTP:[log in to unmask]] > > Reply To: TechNet E-Mail Forum.;[log in to unmask] > > Sent: Friday, December 03, 1999 7:34 AM > > To: [log in to unmask] > > Subject: Re: [TN] Fungicidal Laminate > > > > In a message dated 12/02/1999 2:54:44 PM US Eastern Standard Time, > > [log in to unmask] writes: > > > > > > > > It seems to be my week for strange requests. > > > Does anyone know of a fungicidally treated FR4 laminate? Or of any > > > fungicidal treatment which can be applied to an assembled circuit > > board. > > > > > > > I can't really see the need for a fungicide. Most IPC specs have the > > requirement that the base material, such as laminate, mask, and coating > be > > non-nutrient in nature, which means it would not support growth of a > > fungus. > > > > Doug Pauls - CSL > > ############################################################## > TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or > 847-509-9700 ext.5365 > ############################################################## > ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################