SiO2 Base Glasses: S73a

About Property Data Summaries.

Reference: NBS Technical Note 1212

Other materials: Silicate Glasses

Material Summary:

Molar composition: 73.9% SiO2 + 10.0% B2O3 + 0.226% CaO + 4.71% K2O + 10.2% Na2O + 0.828 BaO
Specific Material: UBK-7
Manufacturer: Schott

Property Summary:

Property                           Value  Environment  Notes
---------------------------------  -----  -----------  --------------------------------------
Crack Growth Exponent []   .......: 
Elastic Modulus [GPa]   ..........: 
Fracture Energy [J/m2]  ..........:  
Fracture Toughness [MPa m1/2].....:  0.89  Vacuum       Double cantilever beam
                                    0.90  Vacuum       Notched beam


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Date created: 08 February 2001
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