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¡¤ Deviation from spherical form for grade "S": less than 1¥ìm.
¡¤ Comparative difference of diameters: 6¥ìm 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)(¡Ê)
100
100
200
Nominal diameter (mm) 0.3 ~ 0.7
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