Would you please fax this to Richard or give me Richard"s e-mail please 
Properties of Soda-Lime-Silica Float Glass/Pilkington ATS-129
 
 
 
Technical Information 
                                                                                                        
ATS-129 
 October 4, 2000
PROPERTIES OF SODA-LIME-SILICA FLOAT GLASS
 
 
Modulus of Rupture (M.O.R.) in Flexure for 60-Second Load Duration: 
        Mean M.O.R.                                6,000 psi      (41 MPa)    Annealed 
        (Probability of breakage 50%)                12,000 psi    (82 Mpa)    Heat Strengthened 
                                                24,000 psi    (165 Mpa)  Tempered 
        Typical Design M.O.R.                        2,800 psi      (19 Mpa)    Annealed 
        (Probability of breakage 0.8%)                5,600 psi      (39 Mpa)    Heat Strengthened 
                                                11,200 psi    (77 Mpa)    Tempered 
Modulus of Elasticity (Young’s)                        10.4 x 10^6psi   (7.2 x 1010Pa) 
Modulus of Rigidity (Shear)                        4.3 x 10^6psi     (3.0 x 1010Pa) 
Bulk Modulus                                        6.2 x 10^6psi     (4.3 x 1010Pa) 
Poisson’s Ratio                                        0.23 
Density                                                158 lb/ft³    (2.53 g/cm³) 
Coefficient of Thermal Stress                        50 psi/°F    (0.62 MPa/°C) 
Thermal Conductivity at 75°F                        6.5 Btuin/hr°Fft²    (0.937 Wm/m²°C) 
Specific Heat at 75° F                                0.21 Btu/lbmF    (0.88 kJ/kgC) 
Coefficient of Linear Expansion (75-575F)        4.6 x 10-6in/in°F    (8.3 x  10-6mm/mm°C) 
Hardness (Moh’s Scale)                                5-6 
Softening Point (ASTM C338)                        1319°F    (715°C) 
Annealing Point (ASTM C336)                        1018°F    (548°C) 
Strain Point (ASTM C336)                        952°F      (511°C) 
Index of Refraction: 
        (0.5893 m, Sodium D Line)                1.523 
        (1 m)                                        1.511 
        (2 m)                                        1.499 
Emissivity (Hemisperical) at 75°F                0.84 
Stress-Optical Coefficient                        Stress (psi) = 2.18 x Retardation (m) / thickness (in) 
The information contained in this bulletin is offered for assistance in the application of Pilkington North 
America, Inc. flat glass products and like products manufactured and sold under the Pilkington Libbey-
Owens-Ford Co. name, but IT DOES NOT CONSTITUTE A WARRANTY OF MERCHANTABILITY 
OR FITNESS FOR ANY PARTICULAR PURPOSE. Actual performance may vary in particular 
applications. 
Ed Edwards 
Oldcastle BuildingEnvelope 
1101 Fountain Pkwy. 
Grand Prairie, TX. 75050 
Ph: (800) 442-1628 
Fax: (800) 899-4839 
eedwards@oldcastlebe.com  
 
 
 
 
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