What is the waterproof rating IP68/IP69? Don't be fooled by numbers!

Have you ever accidentally dropped your phone into stagnant water on a rainy day and felt scared when you picked it up? Or while playing in the water at the beach, watching others put their phones directly under the water to take photos, one can only carefully carry their phones in their pockets? Nowadays, waterproofing has become a standard feature of flagship phones, but many people do not truly understand the meaning of the waterproof rating of a phone. Can those phones claiming IP68 or IP69 really be safely soaked in water? To answer this question, it is necessary to first clarify what these numbers represent behind them.

IP stands for Ingress Protection, which is the protection level standard established by the International Electrotechnical Commission. The common format is IPXY. The first digit X represents the dustproof level, usually ranging from 0 to 6. The higher the digit, the stronger the dustproof ability. Level 6 indicates complete dustproof and can block all dust from entering. The second digit Y represents the waterproof level, usually ranging from 0 to 9. The higher the digit, the stronger the waterproof ability. But the key is that the testing conditions for different levels vary greatly, and it is not simply 'the larger the number, the better it can handle all scenarios'.

Many people think that IP69 is the highest waterproof rating, so it must be stronger than IP68, but this is not the case. IP68 is currently the mainstream high waterproof level in consumer grade smartphones, with the standard meaning of complete dust prevention and continuous water immersion protection. However, the specific testing depth, time, and water temperature are often defined by the manufacturer themselves. Some brands may soak in 1.5 meters of water for 30 minutes, while others can soak in 6 meters of water for 30 minutes. The actual waterproof ability may differ several times. IP68 is mainly designed for static water environments, such as emergency situations where a phone accidentally falls into a basin or into shallow water areas of a swimming pool.

IP69 is designed for high-temperature and high-pressure water flow testing, capable of withstanding close range spraying at 80 ℃ and pressures ranging from 8 to 10MPa. It is more suitable for construction sites, car washing, hot springs, and other scenarios, but this does not mean that it can be immersed in deep water. In other words, there is no absolute distinction between IP68 and IP69, only differences in scene adaptability. A phone labeled IP69 may be able to withstand high-pressure hot water flushing, but when facing deep water immersion, it is not as reliable as a phone labeled IP68 at the same time.

Many people think they have won the "waterproof and death free gold medal" after buying IP68 or IP69 waterproof phones, but regret it when their phones are damaged by water. A common misconception is that waterproof phones can be permanently waterproof. In fact, the sealing gasket and waterproof adhesive of mobile phones will age over time, and dropping, bumping, and frequent plugging and unplugging of charging ports will accelerate the deterioration of waterproof performance. Generally speaking, after one year of use, the waterproof performance of a mobile phone may decrease by about 30%, and water damage is usually not covered by the warranty.

Another easily overlooked issue is seawater and pool water. The premise for IP68 and IP69 testing is usually static clean water at room temperature. However, salt in seawater and disinfectants in pool water can severely corrode the internal components of mobile phones, leading to oxidation of the charging port and damage to the speaker. According to data released by Apple, soaking in seawater for 10 minutes is equivalent to 2 hours of freshwater corrosion. Therefore, after playing in the sea, it is best to rinse the surface of the phone with clean water and dry it.

Using a mobile phone while taking a shower also carries risks. The steam during showering can penetrate into the gaps of the phone, and soapy water can corrode the sealant, accelerating the deterioration of waterproof performance. Ordinary IP68 phones may fail after soaking in hot water above 40 ℃ for 10 minutes. IP69K models are more suitable for high temperature and high humidity scenarios such as hot springs and saunas. As for high-pressure water guns, it is not recommended to rinse the phone casually. The pressure of 120 bar in a household car wash machine may exceed the IP69K protection, causing a short circuit in the microphone. Even with IP69 waterproof rating, it can only withstand pressures of about 80 to 100 bar, which is often exceeded by household high-pressure water guns.

When choosing a waterproof phone, the most important thing is to choose according to your needs, rather than blindly pursuing high grades. For ordinary daily use, IPX5 or IPX6 is sufficient to deal with situations such as splashing on rainy days or spilling water on mobile phones. The price is usually several hundred yuan cheaper than IP68 models, making it more cost-effective. Outdoor enthusiasts or professionals who frequently come into contact with water can prioritize choosing IP68 and IP69 dual certified models, which can withstand both deep water immersion and high-pressure water flushing. Hot spring and sauna enthusiasts should consider IP69K models, as ordinary IP68 phones are prone to failure in high temperature and high humidity environments. Besides, don't just look at the level, you also need to consider the testing standards. Both are IP68, some brands have a 1.5-meter-30 minute rating, while others have a 6-meter 30 minute rating, with vastly different actual waterproof capabilities. Before purchasing, be sure to check the specific testing conditions announced by the manufacturer, rather than just seeing the letters "IP68" and feeling at ease.

In daily use, maintenance habits can also directly affect the waterproof life. Frequent plugging and unplugging of charging ports should be avoided to reduce the wear of sealing gaskets; Check the airtightness at the official repair shop once a year; Avoid using in high-temperature environments such as saunas or high-pressure environments such as diving; Even if the appearance of the phone is not damaged after falling, it is recommended to test its waterproof performance. Waterproof is a 'protective shield', not a 'diving certificate'. Only by correctly understanding the testing boundaries of IP68 and IP69, and developing good usage habits, can mobile phones truly play a protective role in critical moments.