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| NEWS |
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OUR PARTICAPATING IN OPTICAL FAIRS ::
SPECIALITY
PRODUCTS ::
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| Photochromic
Blanks |
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Photochromic
Blanks |
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Grey |
Grey
Extra |
Brown |
Brown
Extra |
| Refraction
Index (Nd) |
1.508 |
1.523 |
1.508 |
1.523 |
| Double
Refraction Index (nm/cm) |
<
100 |
<
100 |
<
100 |
<
100 |
| Density
(g/cm3) |
2.35 |
2.39
|
2.35 |
2.39 |
| Abbe Value
(Vd) |
64 |
58.5 |
64 |
58.5 |
| Initial
Transmittance (T0) |
90% |
90% |
86% |
90% |
| Darkening
Transmittance After 5 Minutes (TD5') |
15-50% |
15-50% |
15-50% |
15-50% |
| Half-waxing
Time (minutes) |
<
2 |
<
2 |
<
2 |
<
2 |
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