Hello Angela,

You are correct that the IPC-4101B rigid laminate specification does provide for thickness tolerances for the individual sheets of laminate material, and that IPC does not have criteria for the finished printed board thickness.

We state in IPC-6012B, under 3.4, Board Dimensional Requirements, that "All dimensional characteristics such as, but not limited to, board periphery, thickness......shall be as specified in the procurement documentation."

Regards,

John Perry
Technical Project Manager
IPC
3000 Lakeside Drive # 309S
Bannockburn, IL 60015
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1-847-597-2818 (P)
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1-847-615-7100 (Main)

-----Original Message-----
From: TGAsia [mailto:[log in to unmask]] On Behalf Of qian
Sent: Friday, April 27, 2007 3:01 AM
To: [log in to unmask]
Subject: Re: [TGA] [***SPAM*** Score/Req: 09.11/05.00] [TGA] The question about board thickness tolerance

Dear all,

   We manufact flexible printed circuit board(FPCB),the finished thickness tolerance should according to the requirement of the customer,especially for the gold fingers,If customers have no standard,we can according to the capability we promised.I have not find this criterion in IPC standards,too.But if PCB,the thickness of copper clad lamination should according to the IPC-4101,isn't it?
     
2007-04-27
Angela
======= 2007-04-27 09:37:09 您在来信中写道：=======

>Hi,all
>One of our customer didn't give the PCB thickness tolerance, only told us according to IPC standards. 
>But now we can not find any stds for such tolerance, could you tell me ?
> 
>Thanks a lot!
> 
>Best Regards
>Nora lee
>
>
>_________________________________________________________
>Message sent using Winmail Mail Server
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                    致
礼！
				 
               qian
               [log in to unmask]
					2007-04-27