One-sentence answer: A wet-and-dry shaver supports whole-unit washing, and the main water ingress paths are the detachable mating surface between the shaving head and the body, the body buttons, the Type-C charging port rubber plug, and the bottom cover. Using the CTS Sentinel C28WE (C28) leak detector to perform a vacuum decay whole-unit air tightness test aligns the washable claim with actual sealing capability.
The shaving head assembly is separable from the body, and sealing is provided by the seal ring on the body side. The whole-unit seal must be evaluated with the head installed, and the body itself must be evaluated without the head, so the test solution needs to distinguish between the two states.
The Type-C port is sealed by a rubber plug, and the plug body loses elasticity after long-term opening and closing and exposure to grease. Managing sealing margin is more important than the factory criterion itself.
Users typically rinse under running water and tilt the body. Some paths that do not leak in a static test only appear under dynamic water flow and a tilted posture, so the judgment limit needs margin based on the scenario.
Sealing locations: the seal ring between the shaving head and the body, the mating surface between the body buttons and the housing, the Type-C charging port rubber plug or sealing cover, the bottom cover O-ring, and the body seam and indicator light openings.Consequences of leakage: moisture and shaving foam enter the body, the motor and circuit board corrode, and unstable speed, abnormal noise, or failure to power on occurs; the battery is exposed to moisture with a swelling risk; after the rubber plug fails, the charging port oxidizes and charging becomes impossible.
Handle it differently according to the test purpose. When evaluating the whole-unit seal, use a custom-formed part to simulate the head-installed state and plug the shaving head interface; when evaluating the body itself, directly plug the body-side interface. The two states should use their own programs and criteria, and the same limit must not be mixed.
It depends on the plug material and proper-seating state, and it is a seal that decays over the use cycle. It is recommended to add seating confirmation at the assembly workstation and to evaluate the compression amount and life of the rubber plug in process validation; the judgment limit should reserve margin for this.
Vacuum decay is more suitable. The whole unit does not allow internal pressurization, and the sealing surface between the shaving head and the body may be pushed open under internal pressure; vacuum decay establishes the pressure difference from the outside, which is closer to the direction of external water pressure.
Testing the two states separately makes it accurate. The head-installed state evaluates the whole-unit seal, and the without-head state evaluates the body itself; the criteria must not be mixed. Using only one state means the seal ring compression with the head installed masks body defects, or the assembly error of the shaving head interface is attributed to the body, ultimately misjudging a process problem as a structural problem.
The key to electric shaver air tightness is distinguishing the with-head and without-head states, controlling the decay of elastic seals, and leaving sufficient waterproofing margin. The CTS C28WE uses vacuum decay, ambient drift correction, and 32 programs to suit multi-model on-line testing, forming the factory verification basis for the wet-and-dry claim.
WeChat for technical support
PLUS Douyin
