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October 2015

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Thu, 8 Oct 2015 15:31:17 +0000
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I agree with Doug, but the particle count in the Class 3 assembly area should be kept relatively low. You do not want a bunch of cardboard boxes, etc, stored in the area or you will have some issues with fibers in the solder.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, October 08, 2015 10:25 AM
To: [log in to unmask]
Subject: Re: [TN] Clean room

I would agree with what Gregg has written, but want to stress that you do NOT need a clean room facility to make IPC Class 3.  We do almost all class
3 work and the only cleanroom stuff is in our microelectronics assembly rooms.  A generally clean workplace suffices for most everything.


Doug Pauls
Principal Materials and Process Engineer Rockwell Collins

On Thu, Oct 8, 2015 at 10:05 AM, Gregg Owens < [log in to unmask]> wrote:

> J-STD-001F Has some basic requirements in Section 4. For class 3:
>
> 4.1 ESD Mfg shall establish and implement a documented ESD control 
> program per ANSI/ESD-S20.20 or otherwise specified.
> 4.2 Cleanliness and ambient environments in all works areas shall be 
> maintained at levels the prevent contamination or deterioration of 
> tools, materials and surfaces to be soldered or conformally coated. 
> Eating, drinking, and/or use of tobacco products is prohibited in the work area.
> 4.2.1 Environmental Controls: Should (no requirement) be enclosed, 
> temperature and humidity controlled, and maintained at a positive 
> pressure 4.2.2. Temp and Humidity: At 30% or lower, the Mfg shall very 
> ESD control is adequate. For process control, more restrictive 
> temperature and humidity may be required.
>
> For cleanroom applications ISO 14644-1  Clean Room Standards is the 
> current contractual standard. US FED-STD-209E was cancelled in 2001 
> but is still widely used.
>
> Gregg
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of CANTAGALLO Luigi
> Sent: Wednesday, October 07, 2015 10:58 PM
> To: [log in to unmask]
> Subject: [TN] Clean room
>
> Hello Technetters.
>
> Is there an IPC specification which gives the quality levels of 
> workshops (temperature, humidity, cleanliness) according to the 
> quality of the assemblies?
> For example, assemblies IPC class 3 must be necessarily assembled in 
> clean rooms or just with control of humidity and temperature?
>
> Best regards,
>
> CANTAGALLO Luigi
>
> [@@ OPEN @@]
>
>
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