KBr (Potassium Bromide) is one of the most useful materials for general spectral windows and applications where humidity sensitivity is not a significant concern. KBr is the most commonly used spectral material in IR spectrophotometers. Potassium bromide is grown using the Kyropoulos technique. KBr is prone to cracking, but it can be polished to higher standards under humidity-controlled conditions.customer needs.
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Technical Parameters
Transmission range | 0.23~25μm |
Refractive index | 1.527μm at 10μm(1) |
Reflection loss | 8.3% at 10μm |
Absorption coefficient | 3×10-6 @ 1064nm;14×10-6cm-1 @ 10.6(7) |
Absorption peak | 77.6μm |
dn / dT: | -40.83×10-6 /℃(1) |
dn /dμ= 0: | 4.2μm |
Density | 2.753g / cc(2) |
Melting point | 730℃ |
Thermal conductivity | 4.816W m-1 K-1 @ 319K(3) |
Thermal expansion | 43×10-6 /°K @ 300K(4) |
Hardness | In <100> orientation, Knoop 7 with 200g indenter |
Specific heat capacity | 435JKg-1 K-1 |
Dielectric constant | 4.9 @ 1MHz(6) |
Young's modulus (E) | 26.8GPa(4) |
Shear modulus (G) | 5.08GPa(4) |
Bulk modulus (K) | 15.03GPa(4) |
Elastic modulus | C11 = 34.5 C12 = 5.4 C44 = 5.08(5) |
Fracture modulus | 3.3MPa(475psi)(4) |
Poisson's ratio | 0.203 |
Solubility | 53.48g / 100g water,273K |
Molecular weight | 119.01 |
Class/Structure | Cubic FCC, NaCl, Fm3m, (100) cleavage |
Assembly reference for Kbr beam splitter
Spectral transmission curve
KBr IR transmission curve
Refractive index: (No = Ordinary Ray)
µm | No | µm | No | µm | No |
0.405 | 1.5898 | 0.436 | 1.5815 | 0.486 | 1.5718 |
0.508 | 1.5684 | 0.546 | 1.5639 | 0.587 | 1.5600 |
0.643 | 1.5559 | 0.707 | 1.5524 | 1.014 | 1.5441 |
2.440 | 1.5373 | 3.419 | 1.5361 | 4.258 | 1.5352 |
6.238 | 1.5329 | 8.662 | 1.5290 | 9.724 | 1.5270 |
11.04 | 1.5240 | 14.29 | 1.5150 | 17.40 | 1.5039 |
19.91 | 1.4929 | 23.86 | 1.4714 | 25.14 | 1.4632 |
28.00 | 1.4423 | 30.00 | 1.4253 |
KBr circular window
Ordering info
PN# | Specs (D×L)(mm) | Thickness(L) | S/D | Material grade |
KBRP13-2 | 13.0mm×2.0mm | ±0.1mm | 60/40 | IR |
KBRP20-2 | 20.0mm×2.0mm | ±0.1mm | 60/40 | IR |
KBRP25-2 | 25.0mm×2.0mm | ±0.1mm | 60/40 | IR |
KBRP25-4 | 25.0mm×4.0mm | ±0.1mm | 60/40 | IR |
KBRP25-5 | 25.0mm×5.0mm | ±0.1mm | 60/40 | IR |
KBRP30-5 | 30.0mm×5.0mm | ±0.1mm | 60/40 | IR |
KBRP40-5 | 40.0mm×5.0mm | ±0.1mm | 60/40 | IR |
KBRP45-5 | 45.0mm×5.0mm | ±0.1mm | 60/40 | IR |
KBRP50-5 | 50.0mm×5.0mm | ±0.1mm | 60/40 | IR |
KBr rectangular window
Ordering info
PN# | Specs(D×L)(mm) | Material grade |
KBRP23-41-5D | 23.0×41.0×5.0mm Punched | IR polished |
KBRP23-41-5 | 23.0×41.0×5.0mm Not punched | IR polished |
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