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BaK1 is very similar in transmission to BK7, but has somewhat better response in the near ultraviolet. Alkali and phosphate resistance is superior to BK7.

Index of Refraction (@ 587.6 nm): 1.57250
Abb Factor (vd): 57.55
Density (gm/cm3): 3.19
-30 to +70 (per C): 7.6 10-6
+20 to +300 (per C): 8.6 10-6
Transformation Temperature (C): 592
Young's Modulus (dynes/mm2): 7.30 109
Climate Resistance: 2
Stain Resistance: 1
Acid Resistance: 3.3
Alkali Resistance: 1.2
Phosphate Resistance: 2.0
Knoop Hardness: 530
Poisson's Ratio: 0.252

Changchun Hengrun Optoelectronics Tech. Co., Ltd. 

HR Optics is a precision optics manufacturer offering short lead times,
Excellent products, and competitive prices.
286th Torch Road, High-new Technology Development Zone,
Changchun, Jilin province,China.130012
Tel: ++86- 431-88601057++86- 431-88601067 Fax:++86-431-88601082

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2006 contact HR Optics for quality optics including beam splitters, filters,
Prismss, windows, mirrors, cylindrical Lenses, Lenses, aspheric Lenses, achromatic Lenses, retardation plates, gratings.