TRY IPC-2221, all the coupons are defined in this design specification
 > Date: Tue, 20 Nov 2012 08:30:59 -0600
> From: [log in to unmask]
> Subject: [TN] Thermal Stress, PTH, 2.6.8
> To: [log in to unmask]
> 
> Fellow TechNetters:
> 
>    Where within IPC standards documents does it clearly states what size of coupon should be used to conduct the above method.   I have seen many use a one square inch coupon and yet others use very, very, very much smaller samples size for thermal stress.   Are smaller size coupons valid for thermal stress?  All comments and suggestion are strictly welcomed.
> 
> Victor,
> 
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