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Waterproof tech: Everything you need to know about IP and ATM ratings

How protected is your phone? Find out now.
Features
By
November 27, 2021

Waterproof tech has become a big trend in recent years. But how do you know how protected your device is? Most devices use either IP or ATM ratings. Let’s start by talking about IP ratings. Most high-end smartphones these days either have an IP67 or IP68 rating. These include the Samsung Galaxy S21, OnePlus 9 Pro, and Google Pixel 6 series. But what does that even mean? Let’s dig into it.

Read more: The best waterproof smartphones


What is an IP rating?

IP rating

You probably know that IP ratings have something to do with protection from water and dust, but if you are reading this, that may be 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 entirely 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 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 can drop a phone with an IP68 rating in a freshwater pond, or a tub, and it should be fine. However, if that 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 can erode if a smartphone encounters spills from coffee, soft drinks, or champagne.

Related: To solve the smartphone e-waste problem we first need fewer disposable devices

Remember 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 indicates 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.

Military ready standards

Doogee S90 Review Drop Test

You may be wondering if there are any tougher handsets out there. There are military certifications that guarantee “combat-ready” smartphones that can handle all kinds of damage. MIL-STD-810G-certified smartphones go through a series of 29 tests. These include exposure to shock, vibration, heat, cold, gunfire shock, humidity, and more. You can learn more about these in the link below.

Here: What does MIL-STD-810G mean? Combat ready phones, explained


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 use it 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:

  • If you decide to take your phone in the water, make sure to cover all the ports. Those posts may include SIM and microSD card slots. Your USB power port may also have a cover.
  • If you take your phone into a chlorinated pool, wash it off just with fresh water when you take it out. Don’t use soap or chemicals.
  • Your phone should stay away from saltwater, like the water found in the ocean.
  • Try to avoid using your phone in extreme locations, including places with high heat, like a sauna, or rough environments.
  • If your phone does go into the water, dry it off thoroughly before plugging other accessories into their ports, That includes your USB phone charger or headphones if the phone has a headphone jack. Also, don’t use a hairdryer to dry off your phone; use a good dry cloth.
  • Remove any dirt, hair, or other small objects that you might see inside your phone’s covers and ports. Even small amounts of dirk could damage your microSD card slot, USB power ports, or headphone jacks.

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.