UQG Optics

SCHOTT B270 SUPERWITE ®
B 270 Superwite® is a clear, high transmission crown glass produced by melting high purity raw materials. B 270 Superwite® is marked by a high transmission in the range of the visible radiation and in the UV and IR ranges. Colour neutrality and outstanding transmission properties are two features of B270 Superwite® that have opened up a wide range of possible applications. Wherever light has to be transferred without undergoing any adverse change, clearly and without obstruction, B270 Superwite® is an important element in solving a problem.
Optical Properties
Refractive indices
(condition annealed 40°C/h)
ne
nd
1.5251 ± 0.001 (±0.0003 upon request)
1.5230
Abbe value Ve
Vd
58.3 ± 0.6
58.5
Luminous
transmittance tv
dependent on glass
thickness and CIE
standard luminant
Thickness
[mm]

2.0
4.0
15.0
Standard
D65
[%]
91.7
91.6
91.0
Illuminant
A
[%]
91.7
91.6
91.0
Thermal Properties
Viscosities and corresponding temperatures

Strain point
Annealing point
Softening point
Viscosity
log n [dPas]
14.5
13.0
7.6
Temperature
v [°C]
511
541
724
Transformation temperature Tg in °C   533
Coefficient of mean linear
thermal expansion in the
temperature range of
20 - 300 °C
(statistic measurement)
α(20-300°C) (9.4±0.1)10-6k-1
Mechanical Properties
Density p in g/cm3 2.55
Young's modulus E in kN/mm2 71.5
Poissonn's ratio µ 0.219
Torsion Modulus E in kN/mm2 29.3
Knoop Hardness HK100 542
Chemical Properties
Hydrolytic resistance as per DIN ISO 719
hydrolytic class
Basic equivalent Na2O per each
gram glass grit (µg/g)

HGB 3

170
Resistance to acids as per DIN 12 116
Alkaline class
Surface weight loss
after 6 hours in mg/dmsup>2

2

14
Resistance to Alkalis as per DIN ISO 695
Alkaline class
Surface weight loss
after 3 hours in mg/dmsup>2

2

140


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