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Glass Ceramics
Optical Filters
Optical Glasses
Optical Materials
Technical Glasses
AR Coated Glass
Corning
Flashed White Opal
ITO Glass
Leadglass Xray Protection
Pilkington
Schott
Borosilicate Schott Borofloat
Schott AF 45 Alkali-Free Glass
Schott B270 Superwite
Schott Desag D263T
Sodalime floatglass
SCHOTT AF45
Optical Properties
Refractive Indices
Pretreatment of Samples
n
g
1.5359
Condition as supplied [´as drawn´]
n
F´
1.5318
n
F
1.5313
n
e
1.5275
n
d
1.5255
n
D
1.5254
n
C´
1.5233
n
C
1.5229
Mechanical Properties
Density ρ in g/cm
3
(annealed at 40°C/h)
2.72
Stress Optical Coefficient C in 1.02 · 10-12 m
2
/N
3.2
Young´s Modulus E in kN/mm
2
66.0
Poisson´s Ratio µ
0.235
Torsion Modulus G in kN/mm
2
26.7
Knoop Hardness HK
100
555
Density ρ in g/cm
3
(annealed at 40°C/h)
2.72
Chemical Properties
Hydrolytic Resistance acc. to DIN ISO 719
Hydrolytic Class
HGB 1
Equivalent of Alkali (Na
2
O) 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) ε
r
at 1 MHz
6.2
Dissipation Factor tan d at 1 MHz
9
.
10
-4
Electric Volume Resistivity ρ
D
in Ω
.
cm at the Specified Temperatures ρ
D
for Direct Current
θ = 250°C
6.0
.
10
13
θ = 350°C
3.2
.
10
11
θ = 500°C
1.6
.
10
9
Temperature t
k100
in °C for a Specific Electric
Volume Resistivity of 10
8
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 T
g
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.