Good point ; I've been always satisfied with the performance ; and never
gave that much thought to it (no baking here ; by the time the boards
get used ; they're bone dry) .
As we keep our flash gold to bare minimum ( less than o.5um ) it also
acts as a protection from rubbing .

Boris Cheung ( [log in to unmask] ) from Crowntek (HK) will tell you
exactly the source :
It resembles sandy (unbleached = you're right ) parchment ; some 120 gsm
; well pressed (no fibro) ; still very much matt ;
and the most curious thing : does it suck ! > you remember those wet ink
drying sheets we've had when we couldn't see top of table ?
You put a hand on it and feel it desiccated ; really neat . Knowing
Boris,  it's pretty economical too .
So I skipped the "not to eat" bags and vacuum .

Boris ; could you please share specs and source with us ( reply to all
listed ) .

Thank you                  paul


> ----------
> From:         Carl Levoguer[SMTP:[log in to unmask]]
> Sent:         Thursday, 22 October 1998 18:41
> To:   [log in to unmask]
> Subject:      Re: [TN] Shelf Life/Storage for Bare PCB
>
> As a matter of interest, what kind of paper do you use?
> I would guess shiny is better than matt finish for example to stop
> particulate contamination of the surface.
> Also I would have thought (I may be wrong) that bleached paper may
> contain halide ions for example.
>
> I have interest in this area as I need to store ~500 boards after
> cleaning for SIR testing.
> The boards must be and stay v. clean.
> Any hints or tips greatly appreciated.
>
> Regards
>
> Carl.
>
> >>Reply to your message of 21/10/98 23:47
> >We're getting them interleaved with paper and sealed ;
> >Found that even better than just stacking them up with desiccant ;
> for
> >few reasons .
> >The desiccant and indicators have usually  too localized
> effectiveness
> ;
> >
> >that's why Jim keeps the qty so low .
> >The ESD bag is indeed a luxury ; but I suppose he's got a reason for
> it
> >.
> >To keep segments (ground?) of copper from picking up a charge, Jim ?
> .
> >Did you measure it ; traced it ; or is it just one of the safe
> theories
> >?
> >For us with paper insulation and only the edge (insulated) contact we
> >skipped it .
> >Wrong ?
> >
> >> ----------
> >> From:         Jim Marsico 516-595-5879[SMTP:[log in to unmask]]
> >> Sent:         Thursday, 22 October 1998 3:12
> >> To:   [log in to unmask]
> >> Subject:      Re: [TN] Shelf Life/Storage for Bare PCB
> >>
> >> We require that all boards are individually wrapped in tarnish
> >> inhibiting
> >> paper, and placed in a sealed ESD bag with a humidity indicator and
> >> desiccant.
> >> (No more than 10 PWBs per bag.)
> >>
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> >>End of message
>
> Dr. Carl Levoguer
> CMMT
> National Physical Laboratory
> Queens Rd, Teddington, Middlesex.
> TW11 0LW
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