How to determine if the oleophobic layer of a mobile phone film is worn out?

A: The method for judging the wear of the oleophobic layer: ① Water drop test: Drop a drop of water on the film surface, tilt the phone. If the water drop can roll smoothly without leaving any water marks, it indicates that the oleophobic layer is in good condition. If water droplets spread out, adhere to the membrane surface and leave water marks, it indicates that the hydrophobic layer has been worn. ② Fingerprint test: Touch the film surface with your finger. If the fingerprint remains clearly and is difficult to remove, it indicates that the oleophobic layer is worn. ③ Sliding feel: When sliding the screen, if it feels rough, not smooth or has a sense of resistance, it indicates that the oleophobic layer is worn. ④ Observation method: Observe the membrane surface under light. If there are local areas that appear dark, uneven luster, and obvious wear marks, it indicates that the oleophobic layer is worn. Under normal use, the oleophobic layer of a common membrane begins to wear out within 3 to 6 months, while that of a high-end membrane (with 10,000 wear-resistant reciprocating cycles) can last for about 12 months. Woowhead Guanfudun wear-resistant reciprocating 10,000 times (tested in the brand laboratory), with a water drop Angle of 115°, it can still maintain a good oil-repellent effect after normal use for 12 months. If the oil-repellent layer is severely worn, it is recommended to replace the diaphragm (a 2-piece set costs 159 yuan for backup).