Randy

IPC-D-949 is the predecessor of IPC-D-275 and is thus now obsolete.  IPC 
specifications no longer require measurement of solder thickness.  
Performance of solderability testing is the only evaluation required.  If 
you have to measure for the customer, the requirement would have most 
likely been 0.0003 inches measured at the crest.  (Sorry don't have the 
spec with me on the road).

Regards
Dave
__________________________________________________

David W. Bergman, Technical Director
IPC
2215 Sanders Road
Northbrook, IL  60062-6135
847-509-9700 x340 Phone
847-509-9798 Fax
email  [log in to unmask]
www  http://www.ipc.org

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On Thu, 2 May 1996 [log in to unmask] wrote:

> I have a customer specification requirement to inspect solder coating 
> thickness per IPC-D-949 Class 2.  I reviewed the Design Guide and did not 
> find any solder coat thickness requirements.
> 
> Where in this IPC spec is the solder coat thickness requirements?
> 
> What is the relationship of IPC-D-949 and IPC-D-275?
> 
> If I use the solder coat thickness in IPC-D-275, do I meet the 
> requirements of IPC-D-949?
> 
> Your help is appreciated.
> 
> Randy Reed
> Merix Corporation
> [log in to unmask]
> 
>