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.

Optical Properties and Advantages
K9 glass features a uniform refractive index distribution and moderate dispersion, effectively reducing chromatic aberration and enhancing imaging quality. Its high hardness (Mohs hardness 5.5) and chemical stability enable it to resist environmental corrosion, extending component lifespan. Additionally, K9 glass offers low cost and suitability for mass production, making it widely used in optical instruments such as microscopes, telescopes, and camera lenses.

Precision Manufacturing Process
Manufacturing K9 optical components involves precision processes such as cutting, grinding, and polishing. High-precision machining ensures surface roughness at the nanometer level, reducing light scattering and enhancing transmittance. Coating technologies further optimize performance—anti-reflective coatings boost light transmission, while protective coatings improve wear resistance.

Application Scenarios
K9 glass is indispensable in scientific research, medical, and industrial fields. For instance, microscope objectives and eyepieces utilize K9 lenses to ensure high-resolution imaging, while optical components in laser systems rely on its stability. With technological advancements, K9 glass demonstrates potential in infrared optics and radiation-resistant applications, adapting to complex environmental demands.

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