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For portable, outdoor and automotive electronics are waterproof testing requirements, internationally, IEC, MIL or ETSI as well as SAE have a corresponding test requirements.
IEC/EN60529 waterproof is divided into 9 grades (level 0 ~ Level 8), waterproof grade (e.g. ipx4-Waterproof class 4):
Level 0: Completely waterproof and unprotected.
Level 1: No harmful effects in vertical direction of drip.
Level 2: Vertical drip should have no harmful effect when the vertical surface of the housing is tilted in the 15° range.
Level 3: No harmful effects when pouring water in the 60° range of each vertical surface.
Level 4: No harmful effects to splash water to the shell parties.
Level 5: Water spray in all directions of the housing without harmful effects.
Level 6: Strong water spray in all directions of the housing without harmful effects.
Level 7: The water in the specified pressure is immersed in a specified amount of time and the inlet water is not harmful..
Level 8: The casing inlet water is not harmful after continuous diving according to the conditions agreed between the manufacturer and the user (should be more severe than levels 7).
In the natural environment, Temperature and humidity are inseparable two natural factors, Different areas due to different geographical location, the resulting temperature, humidity effects are also different. This test is used to confirm the suitability of the product for storage, transportation and use under temperature and humidity climate conditions. The degree of rigor of the test depends on the high/low temperature, humidity and exposure duration.
Test criteria for reference:
GB/T 2423.3，IEC 60068-2-78，GB/T 2423.4，IEC 60068-2-30，EIA 364，MIL-STD-810F etc.
For portable, outdoor and automotive electronics have dust testing requirements, Internationally, IEC, MIL or ETSI as well as SAE have a corresponding test requirements.
IEC/EN60529, GB 4208-2008 dust is divided into 7 levels (level 0 ~ Level 6), Dust Rating (e.g. ip5x-dust level 5).
Level 0: Completely dust-free protection.
Level 1: Protects against foreign objects with a diameter greater than 50 ㎜ into the device.
Level 2: Protects against foreign objects with a diameter greater than 12.5 ㎜ into the device.
Level 3: Protects against foreign objects with a diameter greater than 2.5 ㎜ into the device.
Level 4: Protects against foreign objects with a diameter greater than 1.00 ㎜ into the device.
Level 5: Does not completely prevent dust ingress, but the amount of dust entered shall not affect the normal operation of the equipment, shall not affect the safety.
Level 6: Completely dustproof.
Salt mist test is a kind of environmental test which uses artificial simulated salt fog environment to confirm the corrosion resistance of product or metal material by using salt mist test equipment. The degree of rigor of the test depends on the duration of exposure.
Laboratory simulation of salt fog can be divided into three categories: Neutral Salt spray test, Salt spray test of acetic acid, Copper salt accelerated salt spray test.
(1) Neutral salt fog test (NSS test) is one of the earliest applications in the field of accelerated corrosion test method. It uses 5% sodium chloride saline solution, the solution ph value is adjusted in the neutral range (6.5~7.2) as a spray solution. The test temperature is 35 ℃, which requires the sedimentation rate of salt fog to be 1~2ml/80cm/h.
(2) The Salt spray test of acetic acid (ASS test) was developed on the basis of neutral salt spray test. It is the addition of some glacial acetic acid in 5% sodium chloride solution, The ph value of the solution is reduced to about 3, the solution becomes acidic, The final formation of salt fog is also changed from neutral salt fog to acidity. Its corrosion rate is about 3 times times faster than the NSS test.
(3) Copper salt accelerated salt spray test (CASS test) is a kind of rapid corrosion test in foreign countries, The test temperature is 50 ℃, Salt solution to add a small amount of copper salts-copper chloride, Strongly induces corrosion. Its corrosion rate is about 8 times times that of the NSS test.
Test criteria for reference:GB/T 2423.17，IEC60068-2-11,ISO4628-3, ASTM B117, JIS-Z2371, JIS-G3141, GJB 150.1, MIL-STD-810F, MIL-STD-883E etc.
