Changsha Kona Fine Chemical Co., Ltd.

How to Choose the Right Polishing Slurry for Eyeglasses

The eyewear industry in Danyang has achieved remarkable success,

 boasting an annual output of over 400 million pairs of lenses. 

This staggering figure represents an impressive 75% of the national total and an astounding 50% of the global total, 

firmly establishing the city's well-deserved reputation as "China's Eyewear Capital." 

The convergence of highly skilled practitioners, cutting-edge technology, and an unwavering commitment to 

uncompromising quality has catapulted Danyang to the forefront of the eyewear manufacturing industry.


In the lens production workshops of Danyang, automated production lines are set up, with rough grinding and polishing equipment arranged in sequence. 

Resin lens blanks move seamlessly along conveyor belts, undergoing a series of processes,

 including feeding, grinding, and polishing. Astonishingly, in just five minutes, a customized lens is transformed from a resin lens blank, 

accompanied by the splashing of water and the hum of machines.


A senior engineer said that in the polishing process of resin lenses, there is a conversion relationship between the motor speed, 

the diameter of the polishing wheel, and the circumferential speed of polishing different materials. 

The key is that polishing equipment needs to have a frequency converter to set the optimal speed as needed.

 When the wheel is relatively new and large, using the recommended speed is correct. 

A motor with low speed has less vibration, is more stable, saves electricity, and ensures better control over the polishing quality. 

In addition, it is more labor-saving and easier to inspect the quality when polishing in small batches, resulting in a higher first-pass yield.


According to data from iiMedia Research, in the preference of lens types for nearsighted glasses 

among Chinese internet users in 2023, 59.72% of consumers would choose resin lenses, 37.27% would choose PC lenses,

 30.79% would choose glass lenses, 25.93% would choose nylon lenses, and 23.38% would choose MR lenses.


In the process of polishing eyeglasses, the selection of polishing slurry is also crucial. 

When selecting a polishing slurry, it is important to choose different abrasives based on the different materials of the lens.

One of the main advantages of using aluminum oxide is its ability to achieve high surface smoothness.

 Alumina can create mirror-like smoothness on various materials, including metal, plastic, and glass. 

This is because aluminum oxide has a uniform particle size, ensuring consistent surface smoothness during polishing.

It is particularly suitable for polishing resin lenses.Our company's KN-103 series alumina polishing slurry is especially suitable for polishing resin lenses.