Larry:
>From one layman to another; the major difference between the two 
materials is the glass transition temperature.  FR-4 Tg is 120-135 
degrees C. while FR-5 Tg is 150-180 degrees C.  It is a bit harder to 
machine than FR-4 as well.  Hope this helps.

Tom Hybiske, General Atronics Corporation

> To:             mail@ih [log in to unmask]
> From:           mail@ih [log in to unmask]
> Date sent:      07-Sep-95 10:58:48 MDT
> Subject:        FR4 versus FR5

> In laymen terms, what the difference between FR4 and FR5 laminate material?
> 
> Also, looking for a net address or contact for Allen_Bradley EMS fab house
> in Milwaukee.
> 
> --------------------------------------
> Larry L. Pucket
> Sandia National Labs.
> Dept. 2784  MS/0624
> P.O. Box 5800
> Albuquerque, NM 87185-0624
> 
> Email: [log in to unmask]
> Phone: (505) 844-1711
> Fax:   (505) 844-7428
>