IPX RATING SYSTEM 防水等级

The IPX Rating System 
	is used to evaluate how resistant products are to environmental conditions. 

Many cycling and camera products often come with an IPX rating 
	letting the consumer know how well an item will hold up under certain environmental conditions.

The IP (Ingress Protection) numbers are written as IPXX, 
	where “X”s are placeholders for numbers. 
	The first “X” represents solid (dust/particle) resistance 
	the second “X” represents liquid resistance (water).

The list below is how the IPX system is usually represented.
	IPX0 – No protection
	IPX1 – Protects from dripping water
	IPX2 – Protects from vertically dripping water
	IPX3 – Protects from sprays up to 60°
	IPX4 – Protects from splashing water, no matter the direction
	IPX5 – Protects from water jets in any direction
	IPX6 – Protects from powerful water jets
	IPX7 – Protects in water up to 3 feet (1 meter)
	IPX8 – Protects when immersed in water over 3 feet

When looking for cycling equipment or photography equipment, 
	those products that have a higher IPX rating 
		will be able to withstand the elements for longer periods of time without failure.

For those who commute by bike, 
	an IPX4 or greater will help keep your gear dry.