In the early days of laminate all were difunctional - simple polymer chains bonding the package together. Tetrafunctional had bonding formats in 2 polymer chains - thus called Tetra because the 2 chains linked have 4 ends. Polyclad developed a material called Tetra II in the mid 1980's and this was a tetrafunctional resin that had a Tg of 170 F. This was the basis for the current system used in the FR-370. As laminate/resin developers began to improve on the tetrafunctional systems by blending resins to improve performance, they began the term these multifunctional systems. Multifunctionals are by design tetrafunctional and I would use the term interchangeably. Jeffrey Bush Director, Quality Assurance and Technical Support VERMONT CIRCUITS INCORPORATED 76 Technology Drive - POB 1890 Brattleboro, Vermont 05302 Voice - 802.257.4571 ext 21 Fax - 802.257.0011 <http://www.vtcircuits.com/> -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha Sent: Friday, June 30, 2006 11:46 AM To: [log in to unmask] Subject: [TN] tetra-functional vs multi-functional What's the difference between a tetra-functional laminate and a multi-functional laminate? Any performance differences? When would somebody specify a multi-functional over a tetra-functional? Are they inter-changeable? Thank you in advance, Eddie Rocha --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------