To clarify, MIL-P-55110 was originally related to Printed Wiring Boards, which is where the "P" came from. In the 1990s, the move was towards performance based specifications rather than product based specifications. The "PRF" you see in 55110 and 31032 stand for performance. Doug Pauls "Blair K. Hogg" <blair.k.hogg@GAI-T To: [log in to unmask] RONICS.COM> cc: Sent by: TechNet Subject: Re: [TN] 55110 <[log in to unmask] pc.org> 07/31/2003 02:34 PM Please respond to "TechNet E-Mail Forum."; Please respond to "Blair K. Hogg" I'm not exactly sure if this is correct, but the military used to use a letter in its specifications corresponding to the component type, e.g., Mil-R-6106 for Relays, Mil-M-38510 for Microcircuits, Mil-P-55110 for Printed Wiring Assemblies. The PRF designation came about as the specs changed to "performance" specifications as opposed to specific device specifications. Blair >>> [log in to unmask] 07/31/03 01:37PM >>> Hi Franklin, For what it's worth- MIL-P-55110 Rev D, dated 12/31/84 was revised to MIL-PRF-55110 Rev E, dated12/31/93. I don't know what the "P" and "PRF" denote. Regards, Mark Hargreaves -----Original Message----- From: Franklin D Asbell [SMTP:[log in to unmask]] Sent: Thursday, July 31, 2003 10:23 AM To: [log in to unmask] Subject: [TN] 55110 Can anyone tell me the difference between MIL-P-55110 and MIL-PRF-55110 Have a drawing where MIL-P-55110 is noted. Thanks Franklin --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.hubbell.com - Hubbell Incorporated ********************************************************************** --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------