Hi, 
Once upon a time there was IPC-A-600C.
I didn't throw it away, greenfields and so on.
The requirements for ROUGHNESS -only visual inspection of cross sectioned
holes- were:
Nodules, Vertical:
REJECTABLE:
1. Roughness or nodules reduces plating thickness below minimum
requirements.
2. Roughness or nodules reduces finished hole size below minimum
requirements.
Note:Excessive nodules or roughness in thin plating or plating voids can
result in outgassing in the laminate during soldering.
Oldtimers who know these facts could think that the commentary is obvious.
The new IPC-A-600F does not mention this fact.
When in doubt, I usually perform a solderability test (Wave soldering),
followed by a visual examination.
Gaby


> ----------
> From:         Charles E. McMahon[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Charles E. McMahon
> Sent:         ?יום חמישי 03 אוגוסט 2000? 14:47
> To:   [log in to unmask]
> Subject:      Re: [TN] Hole wall roughness
> 
> As a follow on to your comment Alain to hole wall roughness.
> 
> I have seen customers reject boards for hole wall roughness. Using desmear
> for cleaning after drill leaves a jagged surface of glass fibers when seen
> in cross-section. Plating to it is fine but it put doubts of hole wall
> strength in the customers view.
> 
> As there are no IPC Standards for determining the roughness of a hole
> wall,
> can a customer reject a board simply based on a unilateral perception that
> the hole "looks rough".
> 
> Is there a specification outside of IPC that is available for this issue.
> Would appreciate your thoughts.
> 
> Charles McMahon
> 
> 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Alain Savard
> Sent: Thursday, August 03, 2000 7:09 AM
> To: [log in to unmask]
> Subject: Re: [TN] Hole wall roughness
> 
> 
> Hi Shirley,
> 
> You could always verify for drilled hole diameter, wicking and nodules
> with
> a microsection. Of course this works best after plating and can be
> inspected
> as per IPC-6012 and IPC-600. You will also get a general idea of the
> roughness just by looking at it still on a microsection, this can be
> checked
> on the section prior to plating, but there are no IPC standards for it.
> 
> P.S. Wicking is best seen on a non-metallographic microscope wit a good
> depth of field.
> 
> Hope this helps,
> 
> Alain Savard, B.Sc.
> Chemical Process Analyst
> CAE Electronics Ltd.
> e-mail: [log in to unmask]
> 
> -----Original Message-----
> From: Shirley Xiao [mailto:[log in to unmask]]
> Sent: August 3, 2000 5:32 AM
> To: [log in to unmask]
> Subject: [TN] Hole wall roughness
> 
>   Is there anyone knows how to measure hole wall
> roughness after drilling or after plating? (Notes:I've
> searched TechNet archive but there is nothing about
> hole wall roughness.)
> 
>   Thanks and best regards
>   Shirley
> 
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