UQG Optics

SCHOTT AF45


Optical Properties
Refractive Indices    
Pretreatment of Samples ng 1.5359
Condition as supplied [´as drawn´] n 1.5318
  nF 1.5313
  ne 1.5275
  nd 1.5255
  nD 1.5254
  n 1.5233
  nC 1.5229
Mechanical Properties
Density ρ in g/cm3 (annealed at 40°C/h) 2.72
Stress Optical Coefficient C in 1.02 · 10-12 m2/N 3.2
Young´s Modulus E in kN/mm2 66.0
Poisson´s Ratio µ 0.235
Torsion Modulus G in kN/mm2 26.7
Knoop Hardness HK100 555
Density ρ in g/cm3 (annealed at 40°C/h) 2.72
Chemical Properties
Hydrolytic Resistance acc. to DIN ISO 719  
Hydrolytic Class HGB 1
Equivalent of Alkali (Na2O) per gram of glass grains in μg/g 6.8
Acid Resistance acc. to DIN 12116  
Acid Class 4
alf Surface Weight Loss after 6 hours in mg/dm2 > 250
Electrical Properties
Dielectric Constant (Permittivity) εr at 1 MHz 6.2
Dissipation Factor tan d at 1 MHz 9 . 10-4
Electric Volume Resistivity ρD in Ω . cm at the Specified Temperatures ρD for Direct Current
θ = 250°C 6.0 . 1013
θ = 350°C 3.2 . 1011
θ = 500°C 1.6 . 109
Temperature tk100 in °C for a Specific Electric
Volume Resistivity of 108 Ω . cm 610
Thermal Properties
Viscosity and Corresponding Temperature    
Designation Viscosity
log η [dPas]
Temperature θ [°C]
Strain Point 14.5 627
Annealing Point 13.0 663
Softening Point 7.6 883
Transformation Temperature Tg in °C 662  
Coefficient of Termal Expansion α    
Coefficient of Mean Linear Thermal Expansion α(20-300°C) in 10 -6 K -1 (Static Measurement) 4.5  


WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.