Sealing and waterproof LED point light source and the contact interface between the cover and the base often retain pores. On the surface, it seems that the surface is close to each other. The existence of pores can be clearly found under the microscope, and the connected pores form a gap, especially when the processing is rough, the flatness is poor, the matching between the cover and the base is poor, and the hardness of the waterproof silicone rubber is too large.
Such a point light source will leak through the contact interface gap between the cover and the base. At this time, the blocked fluid will mass transfer through the macro or micro gap under the effect of pressure difference, concentration difference or temperature difference on both sides of the seal; Or under the effect of pressure difference, concentration difference or temperature difference on both sides of the seal, the blocked fluid can carry out one-way molecular leakage mass transfer through the capillary at the contact interface between the cover and the bottom seat.