Paul,
     
        Ive got some "old" Nelco data sheets, and they claim Z axis TCE's 
     of  
     
                50ppm/C below Tg 
               275ppm/C above Tg
     
        Roger


______________________________ Reply Separator _________________________________
Subject: [TN] FW: [TN] Woh Nelco.............
Author:  "TechNet E-Mail Forum." <[log in to unmask]> at #email
Date:    08/09/99 15:56


Not sure if this got through first time. If it did apologies for 
repeating it. 
     
> ----------
> From:         Geoff Layhe
> Sent:         08 September 1999 10:10 
> To:   [log in to unmask]
> Subject:      RE: [TN] Woh Nelco............. 
> 
> Paul,
> I don't have information on N4000-2 but the figures usually quoted for 
> Z axis expansion in FR4 laminate with a Tg of 140ºC are 150-200ppm/ºC. 
> This is for a measurement range between 50-200ºC. 
> If the measurement range is below the Tg then the Z expansion is 
> usually quoted as 30-40ppm/ºC.
> 
> Hope this helps.
> Geoff Layhe
> Lamar-UK
> www.lamar-uk.co.uk
> 
> ----------
> From:         PAUL BROWN[SMTP:[log in to unmask]] 
> Reply To:     [log in to unmask]
> Sent:         07 September 1999 19:07 
> To:   [log in to unmask]
> Subject:      [TN] Woh Nelco............. 
> 
> Does anybody know the CTE Z for Nelco N4000-2, 6 or 13. I checked 
> there
> website and unlike the values for x and y the z values are specified 
> in
> %. if 3.5% is in fact correct would that not mean  CTE of  3500 PPM?? 
> Help would be great...............Paul
> 
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