Potassium Bromide (KBr) Optical Windows

Potassium Bromide (KBr) Optical Windows / Infrared KBr Crystal Windows

Product Overview
Potassium Bromide (KBr) is a highly transparent infrared optical crystal widely used in FTIR spectroscopy and infrared optical systems. It offers excellent transmission over a broad infrared wavelength range and is ideal for IR windows, beam splitters, and spectroscopy sample windows.

KBr is hygroscopic and must be handled and stored in dry environments.

Optical Transmission
Transmission Range: 0.2 – 25 μm
Typical Transmission: >92% (within 0.2 – 25 μm range)

Physical Properties
Refractive Index (nD): 1.559
Refractive Index at 10 μm: 1.525
Density: 2.75 g/cm³
Melting Point: 730 °C
Mohs Hardness: 2
Cleavage Plane: [100]
Solubility in Water: 53.5 g / 100 g H₂O
Thermal Expansion Coefficient: 3.76 × 10⁻⁵ / °C
Thermal Conductivity: 0.0115 cal / (cm·s·°C)

Key Features
Wide infrared transmission range
High optical transparency
Suitable for FTIR applications
Low absorption in IR region
Easily machinable and polishable

Important Handling Notes
KBr is highly hygroscopic.
Store in dry, moisture-free conditions.
Avoid exposure to humidity.
Handle with gloves to prevent surface damage.
Not recommended for humid environments without protective measures.

Typical Applications
FTIR spectroscopy
Infrared optical windows
IR beam splitters
Spectroscopy sample holders
Infrared optical instruments

Customization
Custom sizes and thickness available
Single-side or double-side polished
Custom shapes available upon request
OEM processing supported

Packaging
Moisture-proof packaging
Vacuum sealed protection
Individual protective box