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Histology Supplies Overview
Glass Microscope Slides
Coverslips

Schott D263M Glass Coverslips Technical data

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 Ԑr at 1 MHz 6.7
Dielectrical loss factor tan δ at 1 MHz 61·10-4
Electrical volume resistance pD in Ω · cm at defined temperatures pD 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
ne (λ = 546.1nm): 1.5255 ±0.0015
nD (λ = 589.3nm): 1.5230
Above value ve: 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%