ackground-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Conclusion

For outdoor rain with no submersion, choose IP65. For a marine deck with occasional immersion, choose IP67. For continuous underwater applications like bilge pumps, choose IP68 but always check the specified depth. For high-pressure hot washdowns in food processing, choose IP69K.

For marine applications specifically, ABILKEEN recommends the 19mm Push Button Marine series with IP68 (2 meters for 24 hours), 316L stainless steel housing, and gold-plated contacts. This combination delivers long-term reliability in saltwater environments.

Need IP test reports or a sample kit? Contact ABILKEEN.

Introduction

When you choose a waterproof switch for a marine panel or outdoor kiosk, you see labels like IP65, IP67, and IP68. But what do these numbers actually mean? And does a higher number always mean better?

No. The right IP rating depends entirely on your environment. This guide explains each rating step by step, shows you how testing works, and helps you make the right choice for products like a 19mm anti-vandal metal push button.

Part 1: What Do the Two Digits Mean?

The IP code (Ingress Protection) is defined by IEC 60529. Two digits tell the full story.

First Digit – Solids Protection (Dust)

A first digit of 5 means dust-protected – limited ingress is allowed but no harmful deposits. A first digit of 6 means dust-tight – complete sealing. For any serious outdoor or industrial waterproof switch, you need IP6x. The "6" means dust-tight.

Second Digit – Liquids Protection (Water)

A second digit of 5 means protected against water jets from a 12.5mm nozzle at 3 meters distance. A digit of 6 means powerful water jets from a 12.5mm nozzle at higher pressure. A digit of 7 means protected against temporary immersion in 1 meter of water for 30 minutes. A digit of 8 means protected against continuous immersion, with depth and time specified by the manufacturer.

Putting It Together

IP65 means dust-tight plus protection against water jets. IP67 means dust-tight plus protection against temporary immersion (1 meter for 30 minutes). IP68 means dust-tight plus protection against continuous immersion (for example, 2 meters for 24 hours).

Important: IP68 is not a single standard. One manufacturer's IP68 switch might be rated for 2 meters for 24 hours. Another might be rated for 10 meters for 7 days. Always check the specification sheet.

Part 2: How Testing Works – Step by Step

Understanding the test procedure helps you trust the rating.

Step 1: IP6X (Dust-Tight) Test

The switch is placed in a chamber with talcum powder. A vacuum pump creates negative pressure inside the enclosure. The test runs for 8 hours. To pass, no dust may enter the enclosure.

Step 2: IPX7 (Temporary Immersion) Test

The switch is submerged in 1 meter of water. The test lasts 30 minutes. To pass, no water ingress that affects function is allowed.

Step 3: IPX8 (Continuous Immersion) Test

The depth and duration are agreed between the manufacturer and the customer. For example, ABILKEEN tests its marine switches at 2 meters for 24 hours. To pass, no continuous water ingress is allowed.

Step 4: IPX5 and IPX6 (Water Jet) Tests

A nozzle sprays water from all angles. For IPX6, the test uses 100 liters per minute at 100 kPa pressure. To pass, no harmful water ingress is allowed.

Part 3: Which IP Rating Do You Need?

For indoor, dry environments: IP54 is sufficient.

For outdoor rain with no submersion: IP65 is the right choice. This covers EV chargers, public kiosks, and ticket machines that face rain and directed jets from cleaning crews.

For marine decks and boat control panels: You need IP67 or IP68. Constant spray, saltwater, and occasional submersion require a higher level of protection. For a 19mm Push Button Marine switch, ABILKEEN recommends IP68 with a 2-meter, 24-hour rating.

For continuous underwater use like bilge pumps: IP68 is required, but you must check the specified depth and duration. Not all IP68 switches are rated for permanent submersion.

For high-pressure washdowns: IP66 or IP69K is needed. IP69K is a separate standard (ISO 20653) for high-pressure, high-temperature washdowns.

Part 4: How to Verify an IP68 Waterproof Switch

Before installing a claimed IP68 waterproof switch, follow these steps.

Step 1: Read the Fine Print

Look for the exact depth and duration on the specification sheet. If it only says "IP68" without numbers, request the test report from the manufacturer.

Step 2: Inspect the Seals

Check for three critical sealing points. First, a silicone O-ring on the front panel bushing. Second, a double-lip silicone gasket inside the plunger actuator. Third, epoxy potting or molded rubber at the wire exit.

Step 3: Check the Panel Hole

Use exactly a 19.0mm punch with a tolerance of plus 0.1 and minus 0.0 millimeters. Deburr the hole completely – sharp edges will cut the O-ring and destroy the seal.

Step 4: Tighten Correctly

Apply torque of 3 to 5 newton-meters. This is about finger-tight plus a quarter turn with a tool. Too loose allows water to enter through the panel gap. Too tight causes the O-ring to extrude out of its groove, creating a leak path.

Part 5: FAQ – Three Common Questions

Question 1: Can I use an IP67 switch continuously underwater?

No. IP67 is rated for temporary immersion only (1 meter for 30 minutes). Continuous submersion will force water past the seals over time due to pressure cycling. For continuous underwater use, choose IP68 with a specified depth rating.

Question 2: Does IP68 make the switch harder to press?

Slightly, but not much. IP68 switches require tighter seals. On a 19mm metal push button, you may feel a firmer actuation force – for example, 450 grams compared to 350 grams for an IP65 version. ABILKEEN designs its IP68 switches to maintain clear tactile feedback while achieving a complete seal.

Question 3: What IP rating do I need for high-pressure hot water washdown?

You need IP69K. This is a separate standard defined by ISO 20653 for high-pressure, high-temperature washdowns. The test uses 80°C water at 100 bar pressure. Standard IP68 does not cover hot, high-pressure jets. This rating is common in food processing and pharmaceutical plants.

Part 6: Safety Warnings & Professional Tips

Warning 1: IP68 Does Not Mean "Submersible Forever"

Temperature changes cause the seal to breathe. Over months, moisture can accumulate inside the enclosure. For permanent underwater applications, use a breather valve or a potted (epoxy-filled) switch.

Warning 2: Cable Glands Matter

An IP68 switch with an unsealed cable gland is not IP68. The rating applies to the entire system. You must use matching IP68 cable glands and sealant on every wire entry.

Warning 3: Do Not Mix IP Ratings on One Panel

If you install one IP65 switch on a marine panel, it will leak water into the enclosure. That water can then damage other IP68 switches from the inside.

Professional Tip: Gold Plating for Low Voltages

If your waterproof switch carries low-voltage signals such as 5V DC at 10mA, request gold-plated contacts. Standard silver contacts oxidize over time in humid sealed environments. This oxidation causes intermittent failure even when the physical seal remains intact.