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Physical Properties of Selected Glasses 
As provided by the glass manufacturer


Courtsey of 
Garner Glass Company 
177 South Indian Hill Blvd.
Claremont, CA  91711-4996

Web Site URL: <http://www.garnerglass.com>
E-mail: <gglass@garnerglass.com>

             Glass Code  SRI
             Glass Type  IR Absorbing
            Primary Use  Reed switch cases.
           Manufacturer  Nippon Glass Co.
  Expansion Coefficient  92.5
Contraction Coefficient  NA
           Strain Point  410
        Annealing Point  445
                     Tg  NA
        Softening Point  630
          Working Point  965
                Density  2.53
       Refractive Index  NA
           Power Factor  NA
    Dielectric Constant  NA
          Loss Factor %  NA
             Glass Code  R-6 (Stock Only).
             Glass Type  Soda Lime/Flint 
            Primary Use  Compression seals
           Manufacturer  No longer made.
  Expansion Coefficient  93 
Contraction Coefficient  101 
           Strain Point  493 
        Annealing Point  530 
                     Tg  NA 
        Softening Point  700 
          Working Point  985 
                Density  2.53 
       Refractive Index  1.52 
           Power Factor  0.85 
    Dielectric Constant  7.2 
          Loss Factor %  6.1
 
             Glass Code  EN-1 (see Note)
             Glass Type  Borosilicate 
            Primary Use  Kovar seals 
           Manufacturer  Discontinued by Kimble
  Expansion Coefficient  47 
Contraction Coefficient  57     NOTE:
           Strain Point  449  (Available only
        Annealing Point  490   for capillary  
                     Tg  NA    tubes, see 
        Softening Point  710   8250 glass.)
          Working Point  1115 
                Density  2.28 
       Refractive Index  1.48 
           Power Factor  0.26 
    Dielectric Constant  5.1 
          Loss Factor %  1.3 



             Glass Code  KG-33 
             Glass Type  Borosilicate 
            Primary Use  Lab Glassware 
           Manufacturer  Kimble Glass Co. 
  Expansion Coefficient  32 
Contraction Coefficient  36 
           Strain Point  524 
        Annealing Point  570 
                     Tg  NA 
        Softening Point  825 
          Working Point  1240 
                Density  2.23 
       Refractive Index  1.47 
           Power Factor  0.5 
    Dielectric Constant  5.1 
          Loss Factor %  2.6 



             Glass Code  N51-A
             Glass Type  Borosilicate 
            Primary Use  Type I Pharmacutical 
           Manufacturer  Kimble Glass Co
  Expansion Coefficient  49 
Contraction Coefficient  58 
           Strain Point  545 
        Annealing Point  585 
                     Tg  550 
        Softening Point  795 
          Working Point  1175 
                Density  2.36 
       Refractive Index  1.49 
           Power Factor  1.0 
    Dielectric Constant  5.6 
          Loss Factor %  5.6

  
             Glass Code  Quartz 
             Glass Type  High temperaure 
            Primary Use  Low loss electrical & optical
           Manufacturer  Heraeus Amersil
  Expansion Coefficient  5.9 
Contraction Coefficient  NA 
           Strain Point  1125 EC 
        Annealing Point  1220 
                     Tg  NA 
        Softening Point  1730 
          Working Point  1900
                Density  2.20 
       Refractive Index  1.46 
           Power Factor  0.04 
    Dielectric Constant  3.7 
          Loss Factor %  0.01 



             Glass Code  7052 
             Glass Type  Borosilicate 
            Primary Use  Kovar seals 
           Manufacturer  Corning Glass Co.
  Expansion Coefficient  46 
Contraction Coefficient  53    Our stock will 
           Strain Point  435   run out by the 
        Annealing Point  480   end of 1999.  
                     Tg  440   It is no longer
        Softening Point  710   made.
          Working Point  1130  (Available only
                Density  2.28   for capillary  
       Refractive Index  1.48   tubes, see
           Power Factor  0.26   8250 glass.)
    Dielectric Constant  4.9 
          Loss Factor %  1.3

  
             Glass Code  BK-7 
             Glass Type  NA  
            Primary Use  Optical App's
           Manufacturer  Shott Glass Tech. 
  Expansion Coefficient  71 
Contraction Coefficient  na 
           Strain Point  NA
        Annealing Point  NA 
                     Tg  557 
        Softening Point  719 
          Working Point  NA 
                Density  2.51 
       Refractive Index  1.52 
           Power Factor  NA 
    Dielectric Constant  NA 
          Loss Factor %  NA

  
             Glass Code  K-5 
             Glass Type  Soda Lime  
            Primary Use  Optical 
           Manufacturer  Schott Glass Tech.
  Expansion Coefficient  82 
Contraction Coefficient  NA 
           Strain Point  NA
        Annealing Point  NA 
                     Tg  546 
        Softening Point  720 
          Working Point  NA 
                Density  2.59 
       Refractive Index  1.522 
           Power Factor  NA 
    Dielectric Constant  NA 
          Loss Factor %  NA

  
             Glass Code  7070 
             Glass Type  Borosilicate 
            Primary Use  Low Loss Electrical
           Manufacturer  Corning Glass Co
  Expansion Coefficient  32 
Contraction Coefficient  39   (No longer Available)
           Strain Point  455 
        Annealing Point  495 
                     Tg  460 
        Softening Point  NA 
          Working Point  1100 
                Density  2.13 
        Refractve Index  1.47 
           Power Factor  0.06 
    Dielectric Constant  4.1 
          Loss Factor %  0.25 



             Glass Code  7740 
             Glass Type  Borosilicate 
            Primary Use  Lab Glassware 
           Manufacturer  Corning Glass Co
  Expansion Coefficient  32.5 
Contraction Coefficient  35 
           Strain Point  520 
        Annealing Point  565 
                     Tg  525 
        Softening Point  820 
          Working Point  1240 
                Density  2.23 
       Refractive Index  1.47 
           Power Factor  0.5 
    Dielectric Constant  5.1 
          Loss Factor %  2.6 



             Glass Code  S-8060 = TA-23 
             Glass Type  Alk Earth Al Sil
            Primary Use  Battery Seals 
           Manufacturer  Schott Glass Co
  Expansion Coefficient  53
Contraction Coefficient  63 
           Strain Point  653 
        Annealing Point  709 
                     Tg  695 
        Softening Point  843
          Working Point  1061 
                Density  2.74 
       Refractive Index  1.57 
           Power Factor  0.15 
    Dielectric Constant  7.1 
          Loss Factor %  1.07 



             Glass Code  S-8061 
             Glass Type  Cobalt Barium Sil 
            Primary Use  Compression seals
           Manufacturer  Schott/NA 
  Expansion Coefficient  93
Contraction Coefficient  104 
           Strain Point  450 
        Annealing Point  480 
                     Tg  467 
        Softening Point  677 
          Working Point  1035 
                Density  2.60 
       Refractive Index  1.51 
           Power Factor  0.21 
    Dielectric Constant  6.7 
          Loss Factor %  1.41

  
             Glass Code  S-8063 
             Glass Type  Lead free sealing 
            Primary Use  Opthalmic app's
           Manufacturer  Schott Glass Tech
  Expansion Coefficient  92 ± 5 
Contraction Coefficient  101 
           Strain Point  509
        Annealing Point  537 
                     Tg  519 
        Softening Point  703 
          Working Point  1007 
                Density  2.57 
       Refractive Index  1.523 
           Power Factor  0.14 
    Dielectric Constant  6.7 
          Loss Factor %  0.94 



             Glass Code  S-8070 = SB 
             Glass Type  Li Silicate 
            Primary Use  NA 
           Manufacturer  Schott Glass Co
  Expansion Coefficient  94 
Contraction Coefficient  104.5 
           Strain Point  459 
        Annealing Point  481 
                     Tg  465 
        Softening Point  625 
          Working Point  887 
                Density  2.35 
       Refractive Index  1.52 
           Power Factor  NA 
    Dielectric Constant  NA 
          Loss Factor %  NA 




             Glass Code  S-8072 = Cabal-12
             Glass Type  Boron Al Sil 
            Primary Use  Li resist seals 
           Manufacturer  Schott Glass Co
  Expansion Coefficient  62 
Contraction Coefficient  76 
           Strain Point  612 
        Annealing Point  628 
                     Tg  617 
        Softening Point  718 
          Working Point  798 
                Density  2.60 
       Refractive Index  1.58 
           Power Factor  0.17 
    Dielectric Constant  7.1 
          Loss Factor %  1.2 



             Glass Code  8250 
             Glass Type  Borosilicate 
            Primary Use  Mo & Kovar seals
           Manufacturer  Schott, Mains Ger
  Expansion Coefficient  50 
Contraction Coefficient  NA 
           Strain Point  NA    Possible 
        Annealing Point  507   replacement 
                     Tg  490   for 7052 and 
        Softening Point  720   EN-1 glass.
          Working Point  1055 
                Density  2.28 
       Refractive Index  1.49 
           Power Factor  0.22 
    Dielectric Constant  4.9 
          Loss Factor %  1.1 



             Glass Code  8330 
             Glass Type  Borosilicate 
            Primary Use  Lab Glassware 
           Manufacturer  Schott, Mains Ger
  Expansion Coefficient  33 
Contraction Coefficient  NA 
           Strain Point  NA 
        Annealing Point  560 
                     Tg  525 
        Softening Point  820 
          Working Point  1270 
                Density  2.22 
       Refractive Index  1.47 
           Power Factor  0.37 
    Dielectric Constant  4.6 
          Loss Factor %  1.70 



             Glass Code  8340
             Glass Type  Borosilicate Type 1A 
            Primary Use  Low Exp Laboratory Glass
           Manufacturer  Schott Glass Tech Inc.
  Expansion Coefficient  32.5
Contraction Coefficient  NA
           Strain Point  510
        Annealing Point  560
                     Tg  NA
        Softening Point  821
          Working Point  1252
                Density  2.23
       Refractive Index  1.474
           Power Factor  NA 
    Dielectric Constant  NA 
          Loss Factor %  NA 



             Glass Type  Soda Lime/Flint 
            Primary Use  Compression seals
           Manufacturer  Schott, Mains Ger
  Expansion Coefficient  91 
Contraction Coefficient  NA 
           Strain Point  NA 
        Annealing Point  530 
                     Tg  NA 
        Softening Point  715 
          Working Point  1040 
                Density  2.50 
       Refractive Index  NA 
           Power Factor  NA 
    Dielectric Constant  NA 
          Loss Factor %  NA
Last Update March 24, 2002