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给你全部的资料
BK7 Glass
BK7 is a borosilicate crown glass that is used extensively for lenses, windows, and mirror substrates. It is relatively hard, does not scratch easily, and performs well in chemical tests. It also has excellent transmittance--as low as 350 nm.
Index of Refraction (@587.6 nm): 1.51680
Abbé Factor (vd): 64.17
Density (gm/cm3) 2.51
Coefficient of Linear Expansion
(-30o to +70o): 7.1 x 10-6/oC
Coefficient of Linear Expansion
(+20o to +300o): 8.3 x 10-6/oC
Transformation Temperature (oC): 557
Young’s Modulus (dynes/mm2): 8.20 x 109
Climate Resistance: 2
Stain Resistance: 0
Acid Resistance: 1.0
Alkali Resistance: 2.0
Phosphate Resistance: 2.3
Knoop Hardness: 610
Poisson’s Ratio: 0.206 |
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