Marine life jackets should meet the following characteristics

1. High and low temperature resistance performance. After enduring 10 cycles of high and low temperatures, the life jacket should not have any damage such as wrinkling, cracking, expansion, or decomposition.

2. Loss of buoyancy. After immersion in fresh water for 24 hours, the buoyancy loss of a life jacket should not exceed 5%.

3. Oil resistant. After soaking in 0 # diesel for 24 hours, the life jacket should not have any damage such as wrinkling, cracking, expansion, or decomposition.

4. Flame resistant. Life jackets should not continue to burn or melt after being burned for 2 seconds.

5. Strength.

(1) The body of the life jacket and each loop of the lifting ring should be able to withstand a force of 3200N for 30 minutes without damage.

(2) The shoulder of the life jacket should be able to withstand a force of 900N for 30 minutes without damage.

6. Dress up. Without guidance, 75% of the wearing personnel should be able to correctly put on life jackets within 1 minute.

7. Immersion performance.

(1) Correct it. After wearing a life jacket, the average reversal time of the wearer should not exceed the average reversal time when wearing an adult reference test device (RTD). If there is a situation of 'not flipping', the number of 'not flipping' should not exceed the number of times the RTD is passed.

(2) Static balance After wearing the selected life jacket, the wearing personnel should meet the following requirements: a) Clear height: The average clear height of all wearing personnel should not be less than the average clear height when wearing RTD; b) Trunk height: The average torso angle of all wearing personnel should not be less than the average angle when wearing RTD minus 5 degrees; c) Face plane (head) angle: The average face angle of all wearing personnel should not be less than the average angle when wearing RTD minus 5 °; d) Tilt angle: Considering the constraints of net height, torso angle, and plane angle, the upper hemisphere of the life jacket indicator light should be visible when the life jacket light is actually installed in place.

(3) Drowning and diving. After the wearer falls into the water or dives, the life jacket should meet the following requirements: ① Make the wearer surface and keep their face up, and the net height of all wearers leaving the water surface should not be less than the provisions of 5.11.2; ② Do not move or cause harm to the wearer; ③ There is no damage that affects its water penetration performance or buoyancy; ④ Do not cause damage to its attachments.

(4) After the wearer enters the water, the life jacket should not sway left or right, causing the wearer's face to sink into the water. The number of wearers wearing the selected life jacket and returning to a stable fetal position with their face facing up should be at least the same as the number of wearers in the same state as when wearing RTD.

(5) The number of personnel wearing life jackets who can climb onto a rigid platform with a height of 300mm above the water surface after swimming and swimming 25m out of the water should not be less than 2/3 of the number of personnel wearing life jackets.