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Before washing. It can be seen from the photo that the outer frame of the lens has been coated with hardened black paint GT-7.
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SGC04, 05, and 06 were used to test the removal of the surface hardened black paint GT-7 provided by the customer on the lens frame. Heating it to 80°C for 30 minutes did not remove it effectively.
After washing, the color is lighter, but obviously the ink cannot be removed effectively.
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Tested with hardened ink cleaner ACHM04-B, it was found that cleaning with 50°C, 40KHz, 50W/1L ultrasonic waves can effectively remove hardened black paint.
After washing for 5 minutes.
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Repeat the test 5 times, all can be cleaned within 5 minutes.
