Edward J. Valentine asked:

>
>I need to get a question resolved if one or more of you could help me.
>One of my customers is asking us to provide PC Boards using "FR4 Tetra
>Material".  I have not heard of Tetra material before, does anyone know
>what it is?  Thanks, Ed Valentine

Yes, probably quite a few know. I'm not positive I know, but I will tell
you what I think, and having that is better than never hearing from someone
who really knows. A bird in the hand, as they say.

The "tetra" likely means laminate using a tetrafunctional epoxy resin
system. This gives the material a higher Tg (glass transition temperature)
and affects its dielectric constant. Polyclad and Nelco offer materials
with Tg = 140°C Tg's. But there is a material sold by Polyclad called
"Tetra II" which has a Tg of 180. Some of the "multifunctional" resin
systems also go to 180 °C. Given that you say "FR4", my guess is that they
mean "tetrafunctional epoxy", which is no big deal, in my estimation. Good
board suppliers are using this type of material or the higher Tg stuff as
standard op these days. If you are referring to "consumer grade" boards,
this could be an up-spec, though.

cheers,


Jerry Cupples
Interphase Corporation
Dallas, TX USA
http://www.iphase.com/

################################################################
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 web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################