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Deviation from spherical form for grade "S": less than 1m.
Comparative difference of diameters: 6m max.
Surface roughness: 100A max. (grade "S" or "A")
Range of diameters: 0.3 - 7.0mm
 
Glass Code Refractive index
nD
Abbe Number
vd
Density
(103kg/m3)
Thermal Expansion Coeff.
100 ~300degree (10~7/K)
BK-7 1.517 64 2.51 86
LaSF015 1.804 47 4.67 74
 
 
Grade S A B
Diameter variation ()
1.0
2.0
2.5
Deviation from spherical form ()
1.0
2.0
2.5
Lot diameter variation()
6
10
14
Surface roughness(Rmax)()
100
100
200
Nominal diameter (mm) 0.3 ~ 0.7
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