◆K9 glass is a glass product made of K9 material, which is used in optical coating and other fields.  ◆K9 material belongs to optical glass. Because it is crystal clear, it has given rise to a lot of factories that process K9 material as the object, and the processed products are called crystal glass products. The composition of K9 is as follows: SiO2=69.13%, B2O3=10.75%, BaO=3.07%, Na2O=10.40%, K2O=6.29%, As2O3=0.36% ◆ The optical constants of K9 are as follows: Refractive index=1.51630, Dispersion=0.00806, Abbe number=64.06 ◆ The national standard of optical glass is classified according to Abbe number. The glass with Abbe number ≥50 is coronal glass, which is expressed by "K"; the glass with Abbe number <50 is flint glass, which is expressed by "F". Under these two categories, light "Q", heavy "Z", special "T" and chemical element symbols plus prefixes, numbers plus suffixes for subdivision, divided into 18 categories, 141 grades. For example: QF8 (light flint), BaK11 (barium corona), K9 (corona). ◆ Generally, the corona brand belongs to the alkali silicate system, and the vast majority of flint glass belongs to the lead silicate system.

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