KBr (Potassium Bromide) circular window/crystal 30.0mm x 5.0mm, 0.23-25μm

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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Part Number

KBRP30-5

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General Parameters

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Dimensional Drawing

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

4.11.jpg

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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