Physical properties of optical glass
1: the index of refraction (ND)
The refractive index of optical glass is measured by the characteristic line D=589.3nm of sodium element and expressed by ND.
2: specific gravity (s)
Optical glass is used to measure the specific gravity of glass by hydrostatic weighing.
3: chromaticity values (x, y, Y)
According to the regulations of lighting Conference (CIE) in 1931 and 1964, optical glass was used to determine the chroma value of glass under A and D65 lighting.
4: thermal properties
5:, when the optical glass temperature rises 1 degrees, the relative change rate of its length is. The coefficients listed in this catalog are all within 20 ~ 30 C temperature range.

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Physical properties of optical glass

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Physical properties of optical glass	optical glass	optical glass	optical glass	optical glass
Physical properties of optical glass	optical glass	optical glass	optical glass	optical glass