Crystallographic
Syngony	Cubic
Symmetry Class	m3m
Lattice Constants	a = 5.462 Å c = a
Cleavability	(111), perfect

Optical
Refractive Index at ne	1.4349
Refractive Index at nF' - nC'	0.0043
Refractive Index at n10.6	1.2996
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	(-0.95) ... (-1.17) x 10-5
Transmission Range, microns	0.15 - 9.0

Thermal
Thermal Linear Expansion, °C-1 for ±60 °C	(16.5 ... 19.4) x 10-6
Thermal Conductivity, W/(m * °C) at 36 °C	9.71
Specific Heat Capacity, J/(kg * °C)	0.8876 x 103
Thermal Stability, °C	20 ±2
Melting Point, °C	1418

Mechanical
Density, g/cm3 at 20 °C	3.18
Mohs Hardness	4
Vickers Microhardness, Pa	165 x 107
Constants of Elastic Compliance, Pa-1	S11 = 6.83 x 10-12 S12 = -1.53 x 10-12 S44 = 29.58 x 10-12
Young Modulus (E), Pa
in <100> direction	14.61 x 1010
in <111> direction	8.99 x 1010
Shear Modulus (G), Pa
in <100> direction	4.76 x 1010
in <111> direction	3.38 x 1010
Poisson Ratio	0.216

Chemical
Molecular Weight	78.08
Solubility
in water, gram/100 cm3	0.0016

Ref. Index vs. Wavelength l
Wavelength, Microns	Refractive Index
0.2	1.4951
0.5	1.4365
1.0	1.4289
2.0	1.4239
3.0	1.4179
4.0	1.4096
5.0	1.3990
6.0	1.3856
7.0	1.3693
8.0	1.3498
9.0	1.3268
10.0	1.3002
11.0	1.2676
12.0	1.2299

Internal Transmittance t i (l) vs. Wavelength l
Wavelength, Microns	Internal Transmittance
0.2	0.87
0.5	0.97
1.0	0.99
3.0	0.99
5.0	0.99
6.0	0.98
7.0	0.97
8.0	0.88
9.0	0.59
10.0	0.19

Custom sizes and specifications are available on request.