The lens material is S-BSM14. According to the information provided by the customer, the material is soft and not resistant to strong alkali. In addition, in order to take into account the ease of subsequent rinsing and less residue, a low-alkalinity surfactant with a short carbon chain was developed. The cleaning agent "PTC-06i". The pH value of the dust cleaning agent PTC-06i is 11.0. Before cleaning, a large amount of centering oil is attached to the surface.

Place in PTC-06i, 45°C, 40KHz ultrasonic, 30W/L, and shake for 3 minutes. It was found that the dirt was completely washed away. And the lens is not damaged; the surface does not have any fine lines.

Observing from different angles, it is found that the cleanliness is good, no matter what angle you use, there is no trace.

Take another lens and repeat the test. Before cleaning, a large amount of centering oil is also attached to the surface.

Continue to place in PTC-06i, 45°C, 40KHz ultrasonic, 30W/L, and shake for 3 minutes. It was found that the dirt was completely washed away. And the lens is not damaged; the surface does not have any fine lines.

Increase the cleaning temperature to 55°C and repeat the test. Take another piece of lens, and before cleaning, there is still a lot of centering oil attached to the surface.

Place in PTC-06i, 55°C, 40KHz ultrasonic, 30W/L, and shake for 3 minutes. It was found that the dirt was completely washed away. And the lens is not damaged; the surface does not have any fine lines.

Repeat the test. Wash at room temperature (about 23°C). Take another piece of lens, and before cleaning, there is still a lot of centering oil attached to the surface.

Place in 100% PTC-06i, room temperature (about 23°C), 40KHz ultrasonic wave, 30W/L, and shake for 3 minutes. It was found that most of the dirt had been washed away.

However, when the light is rotated and observed at different angles, it is found that some traces can be vaguely seen.

Then put it in PTC-06i, room temperature (about 23°C), 40KHz ultrasonic wave, 30W/L, and shake for 3 minutes (6 minutes in total). It was found that the dirt was completely washed away. And the lens is not damaged; the surface does not have any fine lines.

Repeat the test. The cleaning temperature is 45°C, and the cleaning time is extended to 6 minutes. Take another lens. Before cleaning, there is still a large amount of centering oil attached to the surface.

Put it in PTC-06i, the cleaning temperature is 45°C, and the cleaning time is extended for 6 minutes. In 40KHz ultrasonic wave, 30W/L, oscillating cleaning. It was found that the dirt was completely washed away. And the lens is not damaged; the surface does not have any fine lines.

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