Coverslips - Schott Glass Technical Data

Created by Ben Peterson, Modified on Fri, 24 Jul 2020 at 12:19 PM by Karen Darley

Description

Schott D263M is a colorless borosilicate glass with a very low iron content. It meets requirements laid down in ISO 8255-1. It has high spectral transmission, excellent flatness and a refractive index finely adapted to microscopes. Very good resistance to chemical attack. Fire polished.

Applications

The characteristics of this special composition substrate glass makes it suitable for a variety of applications, including:

Microscope cover glass
Thin film substrate
Touch control panels
Solar cells
Sensors

Mechanical Properties

Density p in g/cm³	2.51
Stress optical coefficient C in 1.02 · 10^-12 m²/N	3.4
Young's Modulus E in kN/mm²	72.9
Poisson number µ	0.208
Modulus of torsional shear G in kN/mm²	30.1
Knoop hardness HK₁₀₀	590

Electrical Properties

Dielectric constant Ԑ_r at 1 MHz	6.7
Dielectrical loss factor tan δ at 1 MHz	61·10^-4
Electrical volume resistance p_D in Ω · cm at defined temperatures p_D for alternating current 50 Hz
	θ = 250°C	1.6 · 10⁸
	θ = 350°C	3.5 · 10⁶

Thermal Characteristics

Viscosity and Temperature
Description	Viscosity log Ƞ [dPas]	Temperature θ [°C]
Strain point	14.5	529
Annealing point	13.0	557
Softening point	7.6	736

Transformation temperature in °C		557

Expansion factor α
Coefficient of thermal expansion α _(20-300°C) in 10^-6 K^-1 (static measurement)	7.2

Spectral Transmittance (d=0.15mm)

spectral transmittance

Optical Properties of Schott D263M

Refractive indicies
n_e (λ = 546.1nm): 1.5255 ±0.0015
n_D (λ = 589.3nm): 1.5230
Above value v_e: 55

The light transmittance for a thickness of 0.15 mm is TVD65 in %
(d=0.15mm) = 91.7 ± 0.3%. In the visible range of the spectrum D26 M is
without absorption. The excellent UV absorption properties make D263M
an ideal material for use in fluorescence microscopy.

Thickness* Dimension of Schott D263M

No. 0 = (0.08 - 0.12mm)
No. 1 = (0.13 -0.16mm)
No. 1.5 = (0.16 - 0.19mm)
No. 2 = (0.19 - 0.23mm)

*Not all thicknesses available in all sizes

Chemical Properties of Schott D263M

Hydrolytic resistance: (DIN ISO 719)
Hydrolytic class: HGB 1
Equivalient of alkali (Na₂O) per gram of glass grains in µg/g: 20
Acid resistance (DIN 12 116)
Acid class: S 2
Half surface weight loss after 6 hours mg/dm²: 1.4
Alkali resistance: (DIN ISO 695)
Class: A 2
Surface weight loss after 3 hours mg/dm²: 88

Chemical Composition of Schott D263M

SiO₂ = 64.1%
B₂O₃ = 8.4%
Al₂O₃= 4.2%
Na₂O = 6.4%
K₂O = 6.9%
MgO -
CaO -
BaO -
ZnO = 5.9%
TiO₂ = 4.0%
As₂O₃ -
Sb₂O₃ = 0.1%