Jim,

MIL-PRF-31032 is a U.S. Department of Defense specification.
According to Dave Corbett at the Defense Electronic Supply Center, it 
was finished 11/1/95. 

I believe that military contractors can obtain copies of military 
standards for free (your tax dollars at work). Contact the 
Standardization Documents Order Desk, Building 4D, 700 Robbins Ave., 
Philadelphia, PA 19111-5094 (sorry, no phone no.), to apply for copies.

Mike Buetow
IPC Technical Staff
2215 Sanders Road
Northbrook, IL 60062
P: 847-509-9700, ext. 335
F: 847-509-9798
[log in to unmask]



On Tue, 16 Apr 1996, Jim Spendow wrote:

>      Where does one get a copy of PRF 31032 and who's spec is it?
>                                         Jim Spendow
>                                         Fax 616-241-8686
>                                         Ph 616-241-8413
> 
> 
> ______________________________ Reply Separator _________________________________
> Subject: Re: FAB-etchback
> Author:  [log in to unmask] at SMTPpost1
> Date:    4/16/96 9:50 AM
> 
> 
> PRF 31032, which is the spec intended to replace MIL P 55110 has the same 
> requirements in it for etchback, which are .0002 - .003" when specified by the 
> master drawing.  If no etchback is specified, than a negative etchback of 
> .0005 is allowable.
>      
> -------------------------------------- 
> Date: 4/15/96 10:23 AM
> To: LISA GREENLEAF
> From: Lyle Andersen
> Can anyone inform me of the current status of the military requirement re: 
> etchback?  A potential customer's blueprint references 55110D and 
> specifically calls out for etchback on type 3 boards (multilayer). However, 
> the board will have a commercial application and,  as is common with 
> blueprint notes, this may be of the "boilerplate" variety.  They may be 
> satisfied with desmear with a little education and persuasion.  Thanks to 
> any who respond.
>      
> Lyle Anderson
> Electrostar-Utah Division (formerly Lundahl Astro Circuits 
> Phone 801-753-4700 ext. 3040
>      
>      
>      
> 
>