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.) > >> > >> ################################################################ > >> TechNet E-Mail Forum provided as a free service by IPC using > LISTSERV > >> 1.8c > >> ################################################################ > >> To subscribe/unsubscribe, send a message to [log in to unmask] with > >> following text in the body: > >> To subscribe: SUBSCRIBE TechNet <your full name> > >> To unsubscribe: SIGNOFF TechNet > >> ################################################################ > >> Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > >> section for additional information. > >> For technical support contact Hugo Scaramuzza at [log in to unmask] or > >> 847-509-9700 ext.312 > >> ################################################################ > >> > > > >################################################################ > >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > >################################################################ > >To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > >To subscribe: SUBSCRIBE TechNet <your full name> > >To unsubscribe: SIGNOFF TechNet > >################################################################ > >Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > >For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > >################################################################ > > > > > >>End of message > > Dr. Carl Levoguer > CMMT > National Physical Laboratory > Queens Rd, Teddington, Middlesex. > TW11 0LW > Direct Line : +44 181 943 6263 > Fax: +44 181 943 6453 > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV > 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################