The latest revision of Mil 13949 is Mil-S-13949H and contains NO requirement
for a water mark.
(my advance copy carries the date of 24 December, 1992)
Hopefully, someone with a final version of this spec. will respond to the water mark question.
I believe the water mark is no longer required.


Fred J. Paul, Sr. Process Engineer
PCB Operations, FLUKE CORPORATION
direct:  206 356-5734  fax:  206 356-6070
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On Tue, 7 May 1996 06:39:48 -0700 [log in to unmask] wrote:

> From: [log in to unmask]> Date: Tue, 7 May 1996 06:39:48 -0700
> Subject: Re: Water Mark
> To: [log in to unmask]
> 
> Ok..... I'll answer my own question. After a little research, I discovered
> the following. My supplier lead me to believe that these specs had been
> recently revised. They were wrong.
> 
> First - MIL-P-13949 F, paragraph 3.8 included a requirement for a water mark.
> Rev G (released in 1987) omitted the requirement in paragraph 3.8.
> 
> Third - IPC-L -115 B, requirements are word for word from paragraph 3.8 of
> MIL-P-13949 G
> 
>