KBr IR Windows for FTIR Liquid Cells – Multiple Sizes

Product Description
Potassium bromide (KBr) crystal provides high infrared transmission
and a broad transmission wavelength range. It is widely used in
Fourier transform infrared spectroscopy (FTIR), spectrophotometers
and infrared optical systems.
KBr is commonly used for spectroscopic prisms, transmission windows
and lenses. These polished KBr windows are suitable for FTIR liquid
cells, demountable liquid cells and other laboratory infrared
spectroscopy applications.
Available Sizes
| Diameter | Thickness |
|---|---|
| Φ10 mm | 2 mm |
| Φ13 mm | 2 mm |
| Φ15 mm | 2 mm |
| Φ20 mm | 3 mm |
| Φ25 mm | 4 mm |
| Φ30 mm | 3 mm |
| Φ30 mm | 5 mm |
| Φ32 mm | 3 mm |
| Φ34 mm | 3 mm |
| Φ37.4 mm | 4 mm |
| Φ38 mm | 6 mm |
| Φ40 mm | 5 mm |
| Φ45 mm | 3 mm |
| Φ50 mm | 3 mm |
Optical & Physical Properties
| Material | Potassium Bromide (KBr) |
| Refractive Index | nd = 1.559; n(10 μm) = 1.525 |
| Transmission Range | 0.2–25 μm |
| Melting Point | 730°C |
| Density | 2.75 g/cm³ |
| Mohs Hardness | 2 |
| Cleavage Plane | [100] |
| Solubility | 53.5 g / 100 g H₂O |
| Thermal Expansion Coefficient | 3.76 × 10⁻⁵ /°C |
| Thermal Conductivity | 0.0115 c/(g·°C·cm·s) |
Product Features
- Broad infrared transmission range from 0.2 to 25 μm
- High infrared transmission performance
- Multiple diameters and thicknesses available
- Suitable for FTIR liquid sample measurements
- Suitable for spectroscopic windows, prisms and lenses
- Custom dimensions available on request
Applications
- FTIR liquid cells
- Demountable liquid cells
- Liquid sample infrared spectroscopy
- Fourier transform infrared spectrometers
- Spectrophotometers
- Infrared transmission windows
- Infrared prisms and lenses
Handling & Storage
KBr is highly soluble in water and sensitive to moisture. To maintain
optical performance, the windows should be handled in a dry environment
and stored in a sealed, moisture-protected container when not in use.
Customization
Other diameters, thicknesses and special dimensions can be customized
according to customer requirements. Please contact us for detailed
specifications and custom size options.














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