After the official announcement of Samsung GN2 image sensor, super fast-charging silicon-oxygen anode battery, and full phase change heat dissipation technology, Xiaomi 11 Ultra has added another world premiere-a high permeability pressure relief valve.
According to Xiaomi’s official release, Xiaomi Mi 11 Ultra will be Xiaomi’s first mobile phone that supports IP68 water resistance (the highest level of dust and water resistance for electrical equipment). It can be immersed in a water depth of 1.5 meters for 30 minutes without any problems.
Xiaomi Mi 11 Ultra first released a high permeability pressure relief valve, which is inspired by professional diving watches. It is only breathable and impervious, and the unit air permeability is twice as much as that of current waterproof mobile phones.
IP68 is familiar to everyone already thinking. The so-called “6” is the highest dustproof level of electrical equipment, which can completely prevent foreign objects and dust from entering the fuselage; “8” is the highest waterproof level of electrical equipment, which can be immersed in water for a long time under a certain pressure without being damaged.
It is reported that this time the Xiaomi Mi 11 Ultra has obtained the IP68 certification from Rheinland and can be immersed in a depth of 1.5 meters for 30 minutes without any problems.
Everyone knows that as the water depth increases, the water pressure will also increase, resulting in a pressure difference between the inside and outside of the mobile phone, which brings huge pressure and challenges to air tightness.
Therefore, some high-end professional diving watches are equipped with a pressure relief valve, which can allow air to circulate without water leakage, and achieve a pressure balance between the inside and outside of the phone.
The high permeability pressure relief valve of the Mi 11 Ultra is based on the same principle. It is only ventilated, not water-permeable, and has a unit air permeability of 25000ml/min under a pressure of 7kPa, which is twice as much as that of current waterproof mobile phones.
In addition, the high permeability pressure relief valve can not only reduce the probability of deep water damage to a certain extent, but also help when taking off and landing on an aircraft, entering and exiting extremely hot and cold environments, or when the mobile phone is squeezed.
Of course, having IP68 is not foolproof. Any IP68 equipment is not permanently effective. With daily use, such as wear and drop, it will cause the airtight performance to decrease and cause the risk of water ingress.
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John Shen 
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