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Water level	Waterproof performance evaluation
Level 0	No anti-wetting properties
Level 1	No anti-wetting properties
Level 1-2	Poor anti-wetting performance
Level 2	Poor anti-wetting performance

Water level	Waterproof performance evaluation
Level 2-3	Poor anti-wetting performance
Level 3	Anti-wetting properties
Level 3-4	Has good anti-wetting properties
Level 4	Has good anti-wetting properties
Level 4-5	Has excellent anti-wetting properties
Level 5	Has excellent anti-wetting properties

Anti-hydrostatic pressure rating	Hydrostatic pressure value P/kPa	Waterproof performance evaluation
Level 0	P<4	Poor resistance to hydrostatic pressure
Level 1	4≤P＜13	Anti-hydrostatic properties
Level 2	13≤P＜20	Anti-hydrostatic properties
Level 3	20≤P＜35	Has good resistance to hydrostatic pressure
Level 4	35≤P＜50	Has excellent resistance to hydrostatic pressure
Level 5	50≤P	Has excellent resistance to hydrostatic pressure
Note: The hydrostatic pressure values measured at different water pressure rise rates are different. The waterproof performance evaluation in the table is based on the water pressure rise rate of 6.0kPa/min.