What is it, and how do you read it for phones?

IP rating

You probably know that IP ratings have something to do with protection from water and dust, but if you are reading this, it’s quite possible that’s as far as your understanding goes.

An IP rating tells you the level of protection a device offers against solids and liquids. The International Electrotechnical Commission sets them. The “IP” stands for Ingress Protection (or International Protection) and is followed by two numbers. The first number indicates the level of protection against solid particles (dust, dirt…) and ranges from one to six. The second number tells you how much water a device can handle without suffering damage and ranges from one to eight — the higher the number, the better the protection. Check out the chart below for detailed info on what each number means:

LevelSolids (first number)Liquids (second number)

Level:

1

Solids (first number):

Protected against solid objects over 50mm (example: hands)

Liquids (second number):

Protected against vertically falling drops of water

Level:

2

Solids (first number):

Protected against solid objects over 12mm (example: fingers)

Liquids (second number):

Protected against direct sprays of water up to 15 degrees from the vertical

Level:

3

Solids (first number):

Protected against solid objects over 2.5mm (example: tools and wires)

Liquids (second number):

Protected against direct sprays of water up to 60 degrees from the vertical

Level:

4

Solids (first number):

Protected against solid objects over 1mm (example: small wires)

Liquids (second number):

Protected against water sprayed from all directions

Level:

5

Solids (first number):

Dust protected — limited ingress of dust permitted

Liquids (second number):

Protected against jets of water from all directions

Level:

6

Solids (first number):

Dust-tight — no ingress of dust permitted

Liquids (second number):

Protected against powerful jets of water from all directions

Level:

7

Solids (first number):

/

Liquids (second number):

Protected against the effects of immersion in water — between 15 cm (5.9 inches) and 1 meter (3.3 feet) for up to 30 minutes

Level:

8

Solids (first number):

/

Liquids (second number):

Protected against the effects of long periods of immersion in water under pressure

As you can tell by the chart above, a handset with an IP67 rating is completely dust-tight and will survive in up to one meter of water (3.3 feet) for no more than 30 minutes. An IP68 rated device is also completely dust-tight and is protected against the effects of long periods of immersion in water, which usually means it will survive in up to 1.5 meters (4.9 feet) of water for a maximum of 30 minutes.

Water-resistant, but not totally waterproof

E Waste smartphone on beach1

Edgar Cervantes / Android Authority

Even if a smartphone has a high IP rating, it may not be completely waterproof. You might drop a phone with an IP68 rating in a freshwater pond, or a tub, and it should be fine. However, if that same phone is dropped in a chlorinated pool, or in the ocean, which has saltwater, that could cause problems. The rubber seals that usually protect a high IP rated phone from water damage could be weakened over time. That could decrease the device’s overall water resistance. Those same seals could also be eroded if a smartphone encounters spills from coffee, soft drinks, or champagne.

Keep in mind that an IP rating for a phone is made under closed lab conditions, and not from real-world situations. In other words, try to keep your phone dry, even if it might have a high IP rating.


ATM Rating

Unihertz Atom XL waterproof

Chase Bernath / Android Authority

There’s another rating to consider for devices, especially for smartwatches; the ATM (Atmospheres) rating system is supposed to indicate how much static atmospheric pressure a device can deal with while in water. It’s actually an older rating system than the IP certification. A rating of 1 ATM means that you are at sea level, outside of water. If a device has a 1 ATM level listed, don’t put it in water under any circumstances.

Here’s a look at the ATM rating system.

RatingPressureDevice Meaning

Rating:

1 ATM

Pressure:

0

Device Meaning:

Do not put in water

Rating:

3 ATM

Pressure:

Under 100 feet

Device Meaning:

Device can be used in the rain, and protected against splashes.

Rating:

5 ATM

Pressure:

Under 165 feet

Device Meaning:

Device can last for short amounts of time submerged in water, like swimming in a pool.

Rating:

10 ATM

Pressure:

Under 330 feet

Device Meaning:

Device can last for much longer amounts of time submerged in water, such as for snorkeling in the ocean.

Rating:

20 ATM

Pressure:

Under 660 feet

Device Meaning:

Device can handle being used for high impact water sports like surfing and jet skiing.


Looking after your devices

Phone with disinfectant wipes 4 IP rating

Edgar Cervantes / Android Authority

An IP or ATM rating gives you peace of mind if you pick up your device with wet hands, accidentally drop it in the pool, or get caught in the rain. Without it, your device could get damaged when it gets in contact with water or even stop working altogether.

However, that does not mean your smartphone is invincible if it does have a high IP rating. Here are some quick tips to ensure you will get the most out of your smartphone:


Consider getting a waterproof pouch

CaliCase waterproof pouch IP rating

Edgar Cervantes / Android Authority

If you must take your phone underwater, we recommend investing in a second layer of protection. Waterproof pouches are a great way to keep your expensive electronics safe when submerged in liquids.

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