What does Waterproof Mean?

waterproof   /ˈwɔːtəpruːf/   adjective   impervious to water  
The IPX Scale
Some brands have tried to invent their own definitions of waterproofing. But actually an international standard already exists – so at Aquapac we use that. The international standard is called IEC 60529 – Degrees of Protection Provided by Enclosures and it was developed by a technical committee of the International Electrotechnical Commission. In the USA it has been adopted by the National Electrical Manufacturers Association (NEMA) as an American National Standard. The whole thing is dozens of pages long, this is a summary:
IP Code:Protected against:at Aquapac we call this:
 IPX1Vertically falling water dropsRainproof
 IPX2Vertically falling water drops – enclosure tilted up to 15º from normal positionRainproof
 waterproof to IPX3Water falling as a spray falling at any angle up to 60º from verticalSprayproof
 waterproof to IPX4Water splashing from any directionSplashproof
 waterproof to IPX5Water jets – water projected at all angles through a 6.3mm nozzleStormproof
 IPX6 waterproofing levelPowerful water jets –  water projected at all angles through a 12.5mm nozzleStormproof
 ipx7Protected against immersion for 30 minutes to a depth of less than 3ft/1mSubmersible
IPX8 waterproofness iconProtected against continuous immersion to a depth of 30ft/10m (see Independent Testing below).Submersible
Independent Testing When we patented the Aquaclip® sealing system it was submitted for independent testing. IPX8 testing was for 30 minutes at the equivalent of a depth of 30ft/10m. Some of the Aquaclips proved waterproof at very much greater depths. Our Keymaster™ case  for example is 100% waterproof to 165ft/50m. In-House Testing During manufacture we batch-test the IPX8 Submersible cases in our pressure chamber. We also subject them to a simple manual squeeze-in-a-basin test (sometimes it’s the real-life tests that really count!)