Not every USB-C cable is designed to withstand water. To identify one with meaningful protection, check its Ingress Protection, or IP, rating. The IEC 60529 standard uses the first digit to describe resistance to solids such as dust and the second to indicate water protection.
Waterproof USB-C cables should carry an IP67 or IP68 rating. An IP67 cable is dust-tight and can withstand immersion in up to one metre of water for as long as 30 minutes. IP68 also indicates dust-tight protection and is intended for continuous immersion, typically beyond one metre, although the exact conditions vary by manufacturer.
These cables are commonly used in demanding settings such as manufacturing, construction, maritime applications and electric-vehicle charging systems. They may be available with male, female or angled connectors, and often use seals to protect the connection.
The USB-C standard itself does not define water resistance. Ordinary cables may survive a splash, but exposure to water can still create risks. A USB-C connector contains 24 contacts that may carry data or power, and water entering the connector can cause short circuits, equipment damage, corrosion or overheating. A wet cable should never be connected to a device, even if it is marketed as waterproof.
Protection is usually provided by a silicone-rubber seal, gasket or locking collar around the connector. Some designs use threaded bayonet couplings that compress a rubber seal as they are tightened. Cables intended for prolonged exposure may use neoprene, while fluoroelastomer, or FKM, can be used when resistance to chemicals or solvents is needed.
A cable that has become wet may generally be reused after it has dried, provided its contacts show no corrosion. Unplug it, shake water from both connector ends and leave it to dry for 24 to 48 hours. A hair dryer can damage the cable, while rice may introduce grit or dust into the connector. If the cable becomes hot after drying, it should be replaced.
Waterproof cable options from brands including Atlavox, Yale and L-Com are available through DIY and technology retailers and Amazon. Prices range from about ten dollars for basic waterproof cables to roughly ten times more for ultra-rugged models. Regardless of price, the official IP rating is the key detail to check before buying.
Sources: Engadget.