SCHOTT D263T

D263T with its specific properties and the large range of thickness with tight tolerances is exceptionally well suited for a number of applications in passive matrix liquid crystal displays, touch control panels and solar technologies. Due to a special down draw production process the glass sheets are marked by fire-polished surfaces. D263T is a borosilicate glass that is produced by melting very pure raw materials. As such it is very resistant to chemical attack.

The features are that it is easy to cut, high luminous transmittance, low mobility of alkali ions, high chemical resistance and excellent flatness. The subsequent properties are based primarily upon the measuring results of the very latest standards and measuring methods. Schott Displayglas retains the right to change the data in keeping with the latest technical standards. Non-tolerance numerical values are reference values of an average production quality.

Density ρ in g/cm3 (annealed at 40°C/h)

2.51

Stress Optical Coefficient C in 1.02 . 10-12 m2/N

3.4

Young´s Modulus E in kN/mm2

72.9

Torsion Modulus G in kN/mm2

30.1

Knoop Hardness HK100

590

Viscosity and Corresponding Temperature
Designation	Viscosity log η [dPas]	Temperature θ [°C]
Strain Point	14.5	529
Annealing Point	13.0	557
Softening Point	7.6	736
Coefficient of thermal expansion a
Coefficient of Mean Linear Thermal Expansion α(20-300°C) in 10-6 K-1 (Static Measurement)		7.2

Hydrolytic resistance acc. To DIN ISO 719
Hydrolytic class	HGB 1
Equivalent of Alkali (Na2O) per gram of glass grains in ug/g	20
Acid resistance acc. To DIN 12116
Acid Class	2
Half Surface Weight Loss after 6 hours in mg/dm2	1.4
Alkali Resistance acc. To DIN ISO 695
Class	A 2
Surface Weight Loss after 3 hours in mg/dm2	88

Dielectric Constant (Permittivity) e at 1 MHz	6.7
Dissipation Factor tan d at 1 MHz	61 . 10-4
Electric Volume Resistively pD in Ω - cm for alternating Current 50 HZ at the Specified Temperatures
θ = 250 °C	1.6 . 108
θ = 350 °C	3.5 . 106

Refractive Indices
Pre treatment of Samples	ng	1.5354
Condition as supplied [´as drawn´]	nF'	1.5305
	nF	1.5300
	ne	1.5255 +/- 0.0015
	nd	1.5231
	nD	1.5230
	nC'	1.5209
	nC	1.5204
Abbé Value	Ve	55
Transmittance Data Tλ - Individual Values in % (t = 1.1 mm)
	λ[nm]	Tλ[%]
	380	89.8
	632.8	91.8
	1064	92.0
Edge Wavelength λC (T = 0.46) in nm	329
Luminous Transmittance Tsub>vD65 in % (t=1.1 mm)	912
t = 1.1 mm	91.7 ± 0.3

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