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Is The IP67 Protection Level Higher Than IP66?

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Baoding Lead Fluid Technology Co., Ltd
Developed high protection series peristaltic pump products
Approved by CNAS
Authoritative laboratory testing
Passed both water spray and short-term continuous immersion tests simultaneously
Complies with IP66/IP67 dual marking requirements!

The product protection level is IP67 higher than IP66
So IP67 can replace IP66
Most people think so
Is it really like this?!
Let’s explore it

  1. What is IP?
    IP stands for Ingress Protection, which means preventing external substances from entering the interior of the device.
  1. What is IP grade?
    The protection level refers to the degree of protection provided by the shell to prevent people from approaching hazardous components, solid foreign objects from entering, or water from entering, according to the inspection methods specified in the standard.

The two numbers in IPXX represent the level requirements for dustproof and waterproof electrical appliances:
The first digit represents the level of dust prevention and prevention of foreign object intrusion (referring to objects such as tools and human fingers that cannot come into contact with live parts inside the electrical appliance to avoid electric shock), which is divided into levels 0-6:

0 is not protected
1 Prevent large solid intrusion
2 Prevent intrusion of medium sized solids
3 Prevent small solids from entering and invading
4 Prevent solid objects larger than 1mm from entering
5 Prevent harmful dust accumulation
6 Completely prevent dust from entering

The second number represents the degree of sealing of electrical appliances against moisture and water immersion, which is divided into levels 0-8:

0 is not protected
1 water droplet dripping into the shell has no effect
When the casing is tilted to 15 degrees, water droplets do not affect the casing
3 Water or rainwater from a 60 degree corner to the outer shell has no impact
4 The liquid splashed onto the shell from any direction does not cause any harm or impact
5 Rinse with water without any harm
6 Can be used for the environment inside the cabin
7 Can withstand immersion in water for a short period of time (1m)
8 Immerse in water for a long time under a certain pressure
It can be seen that the higher the number, the higher the level of protection for dust and water prevention. So, it’s not surprising that the waterproof ability of IPX7 is often mistaken for being higher than IPX6!

But is this the truth?
The fact is not so!
The test conditions for IPX6 and IPX7 are not the same:
*IPX6 is a strong water spray
*IPX7 is a 30 minute brief immersion in water

Due to the inconsistency between the experimental purpose and conditions, it cannot be simply assumed that the protection level of IP67 is higher than that of IP66.

In response to this, GB4208-2008- Degrees of Protection for Enclosures states: “Enclosures marked with a second characteristic number of 7 or 8 are only suitable for short-term or continuous immersion and are not suitable for water spraying (marked with a second characteristic number of 5 or 6), so they do not need to meet the requirements of a number of 5 or 6.”. It clearly indicates that IPX6 can replace levels below IPX6, IPX8 can replace IPX7, and IPX7 cannot replace levels below IPX6.

Products that have passed IP67 testing
Used in IP66 spray environment
Is that still a “white jumping in the waves”?
Everyone still needs to choose carefully!