IP68 Waterproof Rating: What It Really Means

What Does IP68 Waterproof Rating Mean?

IP68 is an Ingress Protection rating. It tells you how well a product resists solid particles and water ingress. You can also review the official Indices de protection IP IEC explanation to understand how IP codes are used for electrical and electronic equipment.

The first number, 6, means the product is dust-tight. The second number, 8, means it can resist continuous immersion in water under conditions stated by the manufacturer.

For an IP68 electrical enclosure, this rating helps protect internal wiring, terminals, relays, sensors, or control parts from dust and water damage. But the rating only matters when the product is used within its tested limits.

Breaking Down the IP68 Code

IP68 is a strong protection level, but it is still a tested condition. It is not an unlimited waterproof promise.

Does IP68 Mean Fully Waterproof?

IP68 is often described as waterproof, but “fully waterproof” can be misleading. The rating does not mean the product can handle every water condition.

An IP68-rated product may pass a clean water immersion test. But saltwater, pool water, chemicals, high pressure, impact damage, poor cable glands, or gasket aging can reduce real protection.

IP68 also does not automatically mean pressure-washer safe. If the product will face high-pressure cleaning, you may need a rating such as IP69K or another washdown-tested design.

In short, IP68 gives strong water ingress protection, but only under the conditions the product was designed and tested for.

IP68 Depth and Time: What You Must Check

Different IP68 products can have different immersion limits. One product may be tested at 1.5 meters, while another may be tested at 3 meters or more.

The same is true for time. Some products are tested for short immersion periods. Others are designed for longer underwater use. If your project needs third-party testing support, IP testing per IEC 60529 can help explain how ingress protection tests are evaluated.

Before choosing an IP68-rated enclosure or device, check the test depth, test duration, water type, temperature, and whether the rating applies to the complete assembled product.

This is especially important for custom enclosures. If holes, windows, switches, vents, or cable entries are added later, the final IP68 protection may change.

IP68 vs IP67 vs IP69K

IP68 is often compared with IP67 and IP69K. These ratings are related, but they are not the same. For a closer comparison between outdoor and immersion protection, see this guide on IP65 vs IP68 enclosures.

For most outdoor electrical enclosure projects, IP67 may be enough for rain and short contact with water. IP68 is better when the enclosure may face flooding, underground water, or longer immersion.

If the enclosure will be cleaned with high-pressure water jets, IP68 alone may not be enough. In that case, check whether IP69K protection is required. You can also compare IPX9 and IP69K testing for washdown conditions.

For projects that need both IP and NEMA references, it is better to compare standards carefully instead of treating them as the same system. This Indices de protection NEMA et IP guide and the official Types de boîtiers NEMA document can help with that decision.

Where IP68-Rated Enclosures Are Used

IP68-rated enclosures are common in wet, dusty, and demanding environments. They are often used where water exposure is likely and failure would cause downtime or safety risks.

Common applications include outdoor electrical enclosures, underground junction boxes, marine equipment, water treatment systems, industrial sensors, flood-prone control systems, and outdoor telecom equipment.

For example, an outdoor power box near irrigation equipment may need stronger sealing than a cabinet installed under a roof. A waterproof junction box in an underground pit may need IP68 protection plus reliable cable entry sealing.

What Can Reduce IP68 Protection?

A product may be rated IP68 in testing, but real field conditions can weaken protection over time. The enclosure body is only one part of the full sealing system.

• Poor cable gland or connector installation
• Low-quality or aging gasket material
• Drilled holes, cutouts, vents, or added switches
• Loose screws or uneven door pressure
• Saltwater, chemicals, UV exposure, vibration, or impact damage
• Condensation caused by fast temperature changes

Cable entries are one of the most common failure points. Even if the box is IP68, water can still enter through poorly sealed glands, connectors, or custom openings. For more detail, see this guide to Presse-étoupes classés IP.

Sealing quality also depends on gasket pressure, hole design, cover structure, and installation control. If your project involves field assembly or custom cutouts, this guide on comment sceller un boîtier électrique can help reduce water ingress risk.

For long-term outdoor use, material choice also matters. Stainless steel, coated steel, aluminum, and plastic enclosures perform differently in saltwater, chemicals, sunlight, and high humidity.

How to Choose an IP68 Enclosure Before Ordering

Do not choose an IP68 enclosure by the label alone. Match the rating to the real working environment, installation method, and risk level.

1. Confirm the IEC 60529 test basis.
2. Ask for the exact immersion depth and test time.
3. Check whether the rating applies to the complete assembly.
4. Make sure cable glands, connectors, and vents are also sealed.
5. Match the enclosure material to water, UV, chemicals, or salt exposure.
6. Ask whether cutouts, windows, locks, or switches affect the rating.
7. Request a datasheet or test report before bulk ordering.

This checklist helps you avoid two common mistakes: paying for a higher rating than your project needs, or choosing an enclosure that cannot survive the real site conditions.

For custom IP68 enclosures, ask whether the supplier can review the full design before production. The final protection should include the box, gasket, door, lock, hinge, cable entries, and all accessories.

If your project needs an IP-rated enclosure for outdoor, wet, or custom electrical applications, you can review Eabel’s IP-rated enclosure options to compare protection levels, materials, sizes, and customization choices before ordering.

FAQ sur l'indice d'étanchéité IP68