BK7HT by Schott

Obsolete Unknown Environmentally Dangerous

BK7HT by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.51633 and a Vd of 64.14348. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K), excellent chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.51633
Abbe Number (Vd) 64.14348
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.03826\,\lambda^2}{\lambda^2 - 0.0060007} + \frac{0.231746\,\lambda^2}{\lambda^2 - 0.0200179} + \frac{1.00915\,\lambda^2}{\lambda^2 - 103.561}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 8.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.5
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance 1
Notes

old, High UV Transmission; glass data moved from former "I_LINE" catalog

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-BSL7 Ohara 1.51633 64.142022
BSL7 Ohara 1.51633 64.150145
K-BK7 Sumita 1.51633 64.1
BK7 Sumita 1.51633 64.1
L-BSL7 Ohara 1.51633 64.065129
H-K9LA CDGM 1.5168 64.198695
H-K9LAGT CDGM 1.5168 64.198695
H-K9L* CDGM 1.5168 64.198732
H-K9L CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BK7 Schott 1.5168 64.167336
N-BK7HT Schott 1.5168 64.17
N-BK7HTi Schott 1.5168 64.17
N-BK7 Schott 1.5168 64.17
N-BK7HTSultra Schott 1.5168 64.17
P-BK7 Schott 1.5164 64.06
UBK7 Schott 1.516801 64.289727
BK8 Schott 1.520152 63.685744
BK7G18 Schott 1.51975 63.58
PK2 Schott 1.518211 65.054286
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