Thanks John!

P. 



Quoting John Perry <[log in to unmask]>:
> Hello Everyone,
>
> Recently, we updated the attached IPC-6012C Figure 3-9 to better illustrate
> requirements for laminate anomalies in Zone A and Zone B. 
>
> A question has come up regarding laminate anomalies in double-blind via
> constructions.  Please refer to the attached PowerPoint file.  The questions
> are:
>
>
> *         Are laminate defects in Zone A allowed after thermal stress?
>
> *         Are any defects allowed in the non-thermal stressed 
> condition in Zone
> A?
>
> *         What would be the size of defects allowed?  Would they be 
> the same as
> for standard PTHs?
>
> *         If defects allowed in non-stressed condition is there a minimum
> spacing requirement of resin/glass between layers?
>
> Let's discuss this through this IPC-600-6012 e-mail forum and see if 
> there is a
> need to further update IPC-6012C Figure 3-9 (or duplicate it and modify as
> needed for double-blind constructions). 
>
> Regards,
>
> John Perry
> Technical Project Manager
> IPC - Association Connecting Electronics Industries(r)
> 3000 Lakeside Drive # 309S
> Bannockburn, IL 60015-1249 USA
> +1 847-597-2818 (tel)
> +1 847-615-7105 (fax)
> +1 847-615-7100 (Main)
> [log in to unmask]
> www.ipc.org
>
>