IP68 Electrical Enclosure and IP68 Metal Enclosure Applications

For some electrical and industrial projects, normal dustproof or splashproof protection is not enough. The enclosure may be exposed to heavy rain, water spray, high humidity, temporary flooding, underground installation, or very wet working conditions. In these applications, buyers may consider an IP68 electrical enclosure or an IP68 metal enclosure to provide a higher level of protection for internal components.

IP68 is one of the highest common IP ratings used for electrical enclosures. It means the enclosure is dust tight and protected against continuous water immersion under specified conditions. However, IP68 should be selected carefully. It is not always necessary for every outdoor project, and it is more complex than IP54, IP55, or IP65 enclosure design. The final performance depends on the complete enclosure structure, including material, gasket, door pressure, cable entry, fasteners, welding, surface finish, and accessories.

For OEM manufacturers, industrial equipment suppliers, outdoor system integrators, and electrical project buyers, understanding IP68 applications can help choose the right enclosure for demanding environments.

What Is an IP68 Electrical Enclosure?

An IP68 electrical enclosure is a protective box or cabinet designed to prevent dust ingress and protect internal electrical components against water immersion. The first digit, 6, means the enclosure is dust tight. The second digit, 8, means the enclosure can resist continuous water immersion under conditions agreed by the manufacturer and customer.

This is different from IP65. IP65 protects against dust and water jets, but it does not mean the enclosure can be submerged in water. IP68 is used when the enclosure may face more serious water exposure, such as underground systems, outdoor electrical equipment in flood-prone areas, wet industrial environments, or special applications where water ingress risk is high.

It is important to confirm the actual test condition for IP68. The water depth, immersion time, cable entry design, and accessories should all be clearly defined. Not every IP68 enclosure is suitable for the same environment.

What Is an IP68 Metal Enclosure?

An IP68 metal enclosure is an IP68-rated enclosure made from metal materials such as stainless steel, aluminum, or properly treated carbon steel. Metal provides strong mechanical protection and is often preferred for industrial, outdoor, and OEM equipment applications.

Compared with plastic enclosures, metal enclosures usually offer better strength, durability, impact resistance, and industrial appearance. They can also be customized with holes, mounting plates, brackets, hinges, locks, grounding points, and surface finishes. However, making a metal enclosure reach IP68 requires careful sealing design.

A metal body alone does not guarantee IP68 protection. Even stainless steel or aluminum can leak if the gasket, door gap, cable gland, screw holes, or welded seams are not designed properly. For a true IP68 metal enclosure, the complete structure must be sealed and tested according to the application requirement.

Common Applications of IP68 Electrical Enclosures

An IP68 electrical enclosure is suitable for applications where dust and water protection are critical. It may be used in outdoor electrical systems, remote monitoring equipment, underground control boxes, marine-related systems, wastewater treatment equipment, irrigation systems, transportation projects, power control units, and industrial equipment exposed to very wet conditions.

In outdoor monitoring systems, IP68 enclosures can protect sensors, control modules, power supplies, and communication devices from rain, dust, and water exposure. In water treatment or pump control systems, they may protect electrical parts installed near water or in humid environments. In transportation and infrastructure projects, they may protect control units installed near roads, tunnels, bridges, or outdoor public equipment.

For telecom and communication equipment, an IP68-rated enclosure may be used when the equipment is installed in harsh outdoor locations where water ingress must be avoided. For energy and utility projects, the enclosure may protect electrical or electronic components used in remote outdoor systems.

When Do You Really Need IP68?

Not every outdoor enclosure needs IP68. Many outdoor electrical cabinets can use IP65 if they only need protection against rain, dust, and water jets. IP68 should be considered when the enclosure may face water immersion, heavy water exposure, or high-risk wet environments.

For example, if an enclosure is installed outdoors but above ground and protected from flooding, IP65 may be enough. If the enclosure is installed in a location where water can collect around it, or if it may be temporarily submerged, IP68 may be a better choice.

Buyers should also consider maintenance and cable entry. If the enclosure needs frequent opening, many cable connections, ventilation holes, fans, or removable panels, achieving IP68 becomes more difficult. A simpler sealed box is easier to make IP68 than a large cabinet with many openings.

The best choice depends on the installation site, water exposure risk, internal components, heat generation, cable layout, and service requirements.

Material Options for IP68 Metal Enclosures

Material selection is important for an IP68 metal enclosure because the enclosure may be used in wet or corrosive environments. The most common materials include stainless steel, aluminum, and coated carbon steel.

Stainless steel is often used for harsh environments because it provides strong corrosion resistance. It is suitable for wet areas, outdoor systems, food equipment, chemical environments, wastewater facilities, marine-related applications, and locations where long-term durability is important. 304 stainless steel is suitable for many general applications, while 316 stainless steel is better for salt, chemical, or highly corrosive environments.

Aluminum is lightweight and naturally corrosion-resistant. It is suitable for outdoor electronic equipment, telecom devices, monitoring systems, and applications where reducing weight is important. Aluminum enclosures can be powder-coated or anodized for improved surface protection and appearance.

Carbon steel can be used when strength and cost are important, but it needs high-quality surface treatment to resist corrosion. For very wet or submerged applications, carbon steel must be carefully evaluated because coating damage can lead to rust.

Sealing Design for IP68 Protection

The sealing design is the most important part of an IP68 electrical enclosure. The enclosure must prevent water from entering through the door, cover, screws, cable entries, welded seams, and accessory openings.

A good gasket is essential. The gasket material must match the environment and provide stable compression. If the gasket is too soft, too hard, or not installed correctly, water may enter. The door or cover must close evenly so the gasket is compressed along the full sealing surface.

Cable entry is another critical point. Waterproof cable glands or sealed connectors should be selected according to the IP68 requirement. If cables enter through the enclosure without proper sealing, the enclosure cannot maintain IP68 protection.

Fasteners and screw holes also need attention. Some IP68 metal enclosures use sealed screws, compression covers, or special fastening structures to prevent leakage. If the enclosure has hinges, locks, or removable panels, these parts must also support the required sealing performance.

IP68 and Heat Dissipation

One challenge with IP68 enclosure design is heat dissipation. Because the enclosure must be sealed, open ventilation holes are usually not suitable. This can make internal temperature management more difficult.

If the internal components generate heat, the enclosure design should consider thermal performance from the beginning. Possible solutions include using aluminum material, increasing enclosure size, using external heat sinks, reducing internal heat load, or designing a sealed thermal transfer structure.

For high-power control equipment, IP68 may not always be practical unless the heat problem is solved. If the enclosure requires fans or open louvers, it may not be able to maintain IP68 protection without special accessories.

This is why the internal component layout and heat generation should be confirmed before choosing an IP68 electrical enclosure.

Surface Finish and Corrosion Resistance

For IP68 applications, surface finish is important because the enclosure may be exposed to water, humidity, or corrosive environments. A good finish helps protect the metal and maintain long-term durability.

Stainless steel enclosures may use brushed, polished, or natural finishes. For harsh environments, stainless steel material selection is often more important than coating. Aluminum enclosures may be anodized or powder-coated. Carbon steel enclosures usually require strong pretreatment and powder coating to resist corrosion.

For outdoor or wet applications, surface finish should not only look good. It should also resist moisture, scratches, UV exposure, and corrosion. If the coating is damaged during installation or transport, corrosion may begin from exposed areas.

Custom IP68 Metal Enclosure Design

Many IP68 applications require custom design because standard enclosures may not match the required size, cable layout, mounting method, or component structure. A custom IP68 metal enclosure can be designed according to drawings, samples, or specific project requirements.

Custom options may include size, material, thickness, sealing structure, mounting plate, cable gland positions, brackets, internal supports, grounding studs, surface finish, and installation method. The design should reduce unnecessary openings because every opening increases sealing difficulty.

For OEM projects, it is best to confirm the IP68 requirement before production. If the enclosure is designed first and waterproofing is considered later, the structure may need major changes. A good manufacturer should review the drawing and check whether the enclosure can realistically meet the required protection level.

Choosing an IP68 Electrical Enclosure Supplier

When choosing a supplier for an IP68 electrical enclosure, buyers should look beyond appearance and price. The supplier should understand sheet metal fabrication, sealing design, gasket selection, waterproof cable entry, surface treatment, and quality inspection.

Before requesting a quotation, buyers should confirm the enclosure size, material, thickness, application, installation location, water exposure level, immersion depth and time, cable entry method, surface finish, quantity, and drawings. Clear information helps the supplier design a more suitable enclosure.

If the project requires formal testing or certification, this should also be confirmed early. IP68 requirements can vary, so the test condition should be written clearly.

Final Thoughts

An IP68 electrical enclosure is used when electrical or electronic components need high-level protection against dust and water immersion. It is suitable for demanding outdoor, wet, underground, marine-related, wastewater, monitoring, telecom, and industrial applications.

An IP68 metal enclosure provides strong mechanical protection and can be customized for industrial and OEM projects. However, IP68 performance depends on much more than metal material. The gasket, door structure, cable entry, fasteners, welding, surface finish, and assembly quality all matter.

For many outdoor projects, IP65 may already be enough. IP68 should be selected when the application truly requires immersion protection or very high water resistance. With the right design and manufacturing process, IP68 metal enclosures can protect valuable components and support reliable operation in demanding environments. For a complete guide to materials, IP ratings, outdoor protection, and custom cabinet options, visit our main page on industrial electrical enclosures for control panels and equipment.