KCl
Potassium Cloride
Optical Transmission
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Spectral Range: 0.21 to 20 µm
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Wave Number Range: 47,600 to 500 cm^-1
Solubility & Handling
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Solubility: 28.1 g / 100g water at 0°C; soluble in glycerine; slightly soluble in alcohol and liquid ammonia.
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Resistivity: Similar to NaCl, it is insoluble in most organic solvents but highly sensitive to humidity.
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Proper Care: KCl is hygroscopic. Exposure to ambient moisture will cause "fogging." Always handle with gloves and store in a desiccator or a temperature-controlled environment.
Thermal & Mechanical Properties
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Melting Point: 776°C
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Thermal Shock: Like most alkali halides, KCl is sensitive to rapid temperature gradients. It must be slowly acclimated to prevent cracking, especially when used in high-power laser environments.
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Knoop Hardness:
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* 7.2 (Indenter in <110> direction)
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9.3 (Indenter in <100> direction)
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Expert Insight: KCl is significantly softer than NaCl. This makes professional anhydrous polishing even more critical to avoid surface "plowing" or scratches during the finishing process.
Is your KCl window showing signs of surface degradation?
Potassium Chloride is particularly prone to moisture-induced pits. Koch Crystal can restore these delicate surfaces to laser-grade specifications and return them in our custom packaging to ensure they stay clear and protected.