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| Reply To: | TechNet E-Mail Forum. |
| Date: | Wed, 3 Oct 2001 17:40:09 -0700 |
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I normally bake the bare boards for 1 hour at 100 ± 5° C. This is sufficient to dry the boards prior to assembly. The only failures that I have encountered was with ridged-flex boards that were not pre-baked.
On Wed, 03 October 2001, "Elensky, Richard" wrote:
>
> We "baked" boards at 55°C for 12 hours (best we could do) (13" x 17" boards,
> 4 layer, 12 per batch). The results were not good. Our survival rate was
> about 80%.
>
> Our PCB fab shop suggested 150°C for 4 hours.
>
>
> Richard Elensky
> Sr. Manufacturing Engineer
> [log in to unmask] <mailto:[log in to unmask]>
>
> Tel: 559-292-1111 x246
> Fax: 559-292-9355
>
> Dantel
> 2991 North Argyle Ave.
> Fresno, CA, 93727
> Visit our web site at:
> http:// www.dantel.com <http://www.dantel.com>
>
>
> ----------
> From: Yu-Hung Shiau [SMTP:[log in to unmask]]
> Sent: Wednesday, October 03, 2001 4:25 PM
> To: [log in to unmask]
> Subject: [TN] PCB baking conditions
>
> Hi,
> * Is anybody sure about the temperatre and time for baking the bare
> PCBs
> that were humidified by condensed moisture to prevent SMT problems?
> * Is 120F for 2 hrs appropriate?
> Thank you for any input.
> YH Shiau
>
>
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