Do you know Glass Code
Publisher:webmaster Release time:2018-04-09 Browsing volume:4234
A glass code is a method of classifying glasses for optical use, such as the manufacture of lenses and prisms.
There are many different types of glass with different compositions and optical properties, and a glass code is used to distinguish between them.
The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index "nd" and its Abbe number "Vd".
For example, BK7 glass code is 517642
The first 3 number means its Refractive index=1.517 (1.xxx)
The last 3 number means its Abbe number=64.2 (xx.x)
The glass properties can vary slightly between different manufacturer types, the following table shows it.
Find more information at LPO Resources "Material data" page.
http://www.lpoptics.com/resources.aspx?colid=22
References
1. https://en.wikipedia.org/wiki/Glass_code
2. http://www.cdgmgd.com/208/
