Water-Resistant Actuator IP68 What It Means and Why It Matters

Water-Resistant Actuator IP68 What It Means and Why It Matters

When it comes to automation in harsh environments — whether on a boat deck, in a wastewater plant, or on offshore equipment — one question keeps coming up:

Is your actuator truly water-resistant?

Many actuators claim to be “waterproof” or “sealed,” but those terms can be misleading. The real answer lies in the IP rating — specifically, IP68.

An IP68-rated actuator isn’t just splash-proof. It’s engineered to survive prolonged submersion, constant moisture exposure, and even direct pressure washing. Let’s break down what that means — and why it matters for industrial, marine, and outdoor applications.

What Does IP68 Mean?

IP stands for Ingress Protection, a standardized rating system (defined by IEC 60529) that measures how well an electrical enclosure resists dust and water.

The two digits in an IP rating have specific meanings:

So when we say an actuator is IP68, it means:

• No dust can get inside.
• It can be submerged in water beyond 1 meter (often up to 5 meters) for extended periods — typically 24 hours or more, depending on the design.

This is far more rigorous than common ratings like IP65 or IP66, which only protect against water jets or heavy rain.

How Is IP68 Achieved? Engineering Behind the Seal

Achieving true IP68 performance isn't about slapping on a rubber gasket. It requires a complete system-level approach to sealing and material selection.

1. Multi-Layer Sealing System

A high-quality IP68 actuator uses multiple barriers:

• Double-sealed bearings: Prevents water from entering along the moving rod.
• Multi-lip wiper seals: Remove debris and moisture before they reach internal components.
• Precision O-rings: Made from UV- and saltwater-resistant materials like Viton® or EPDM.
• Sealed cable glands: Often with molded boots to prevent capillary action (where water wicks along wires).

These layers work together so that even if one fails, others remain intact.

2. Potted Electronics

Unlike industrial actuators with exposed circuit boards, IP68 units use epoxy potting compound to encapsulate the entire PCB.

This does three things:

• Blocks moisture migration
• Protects against condensation
• Adds vibration resistance

It turns the electronics into a solid block — immune to humidity, splashes, and short-term flooding.

3. Corrosion-Resistant Materials

Saltwater is brutal. A true IP68 marine-grade actuator uses:

• AISI 316 stainless steel housing and shaft
• Epoxy-coated lead screws
• Sacrificial zinc anodes to prevent galvanic corrosion

These aren’t optional upgrades — they’re essential for long-term survival at sea.

Where Are IP68 Water-Resistant Actuators Used?

Because of their extreme durability, IP68-rated electric linear actuators are used wherever water exposure is guaranteed.

Common Applications:

• Marine & Boating: Hatch covers, trim tabs, bilge dampers, deployable sensors
• Wastewater Treatment: Valve control in wet wells, gate operation
• Food & Beverage Processing: Washdown areas requiring high-pressure cleaning
• Outdoor Industrial Equipment: Solar tracking systems, irrigation controls, remote valves
• Offshore Platforms: Subsea control pods, safety shut-offs

In all these cases, failure due to water ingress could mean costly downtime, environmental risks, or safety hazards.

IP68 vs. Other Ratings: Know the Difference

Don’t confuse IP68 with lower-tier protection levels.

Only IP68 gives you peace of mind when full submersion is possible.

Why This Matters in Real-World Systems

Think back to pneumatic systems, where reliability also depends on proper air pressure. As explained in Valen Tech Co., Ltd.'s article:

Most pneumatic actuators operate between 60–100 psi — the “sweet spot” for force and efficiency.

Similarly, IP68 is the sweet spot for water resistance. Just as low air pressure causes weak motion in pneumatics, poor sealing leads to silent, creeping failures in electric actuators.

And while older systems used 3–15 psi pneumatic signals for control, modern digital systems rely on smart electric actuators that must stay online — no matter the weather.

If your actuator fails because water got inside, it doesn’t matter how strong the motor was. What matters is survivability.

Final Thoughts

A water-resistant actuator with an IP68 rating is not just a convenience — it’s a necessity in demanding environments.

It combines:

• Full dust and water exclusion
• Advanced sealing technology
• Corrosion-resistant construction
• Potted electronics

…into a single rugged package built to perform when failure is not an option.

Whether you're automating a hatch on a yacht, controlling a valve in a treatment plant, or deploying equipment offshore, always ask:

Is this actuator rated IP68 — or just hoping to survive the rain?

Because in the real world, the difference shows up — eventually.

Looking for reliable, high-performance IP68-rated electric actuators?