Bubble & Inclusion
It is most desirable to manufacture bubble-free optical glass, but the existence of bubbles to some extent is inevitable. Bubbles in optical glass vary in size and number from one glass to another due to the many different compositions and production methods. Glass types which tend to contain relatively more bubbles than usual glass types are marked " B ". Inclusions such as small stones or crystals are treated as bubbles.
Coloring can be determined by measuring spectral transmission, including reflection losses with test pieces of 10 mm
in thickness. The wavelengths corresponding to 80% transmission and 5% transmission are indicated as 405/355 in
units of 5nm, after rounding off 2 and rounding up 3 or more and rounding off 7 and rounding up 8 or more.
Specific Gravity* (d)
Specific gravity is the density value of well-annealed glass referenced against pure water at 4 °C , with the value shown to the second decimal place.
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