In outdoor equipment, smart home devices, industrial control systems, and many other fields, waterproof switches are almost standard. 

However, during the selection process, many engineers and procurement professionals face a common dilemma: What exactly is the difference between IP67 and IP68? 

The price difference is significant, but is the protective performance really that different? Today, from a manufacturer's perspective, we will clarify these two ratings once and for all.

1. Understanding IP Ratings First

The IP (Ingress Protection) rating consists of two digits:

· First digit: Dust protection capability (0-6)

· Second digit: Water protection capability (0-8)

IP6X: 6 represents the highest dust protection level -- complete protection against dust ingress

IPX7 and IPX8: Represent two different water protection test conditions

 2. IP67: Short-Term Immersion Is Acceptable

Definition of IP67:

· Dust protection: Complete dust protection (Level 6)

· Water protection: Withstands immersion in 1 meter of water for 30 minutes without ingress (Level 7)

Key Points:

· Duration: 30 minutes

· Depth: 1 meter

· Condition: Static water, no water flow impact 

· Switch is in non-operating state during testing

Suitable Scenarios:

· Outdoor control cabinets (occasional rain exposure)

· Handheld devices (accidental drop into water)

· Bathroom appliances (splash-proof, not continuously submerged)

· Marine equipment (above deck, not continuously immersed)

3. IP68: Continuous Submersion Withstood

Definition of IP68:

· Dust protection: Complete dust protection (Level 6)

· Water protection: Continuous immersion under conditions specified by the manufacturer without ingress (Level 8)

Key Points:

· No unified standard: Water depth and duration are defined by the manufacturer

· Common specifications: 1.5m/2 hours, 3m/24 hours, or even 10m/continuous

· Switch may be in operating or non-operating state during testing (must be specified)

Suitable Scenarios:

· Underwater lighting fixtures

· Swimming pool equipment

· Diving flashlights

· Marine bilge equipment

· Long-term outdoor exposure (where water can accumulate)

4. Core Differences: At-a-Glance Comparison

Comparison Item                     IP67                                                       IP68

Water                                         Depth 1 meter                                 Manufacturer-specified (typically >1m)

Immersion Time                   30 minutes                                       Manufacturer-specified (typically >30min)

Test Conditions                     Static water                                      May include dynamic water pressure

Continuous Immersion      Short-term only                             Can be continuously submerged

Unified Standard                   Yes (IEC 60529)                               No (Manufacturer-defined)

Cost                                             Lower                                                 Higher (more complex structure)

Sealing Structure               Basic sealing gasket                        Multiple seals + potting compound

5. Why Is IP68 More Expensive?

The cost of IP68 switches is typically 30%-100% higher than IP67, due to:

1. More Complex Structural Design

· IP67: Single-layer sealing gasket + housing snap-fit

· IP68: Double-layer sealing gasket + ultrasonic welding + potting compound treatment

2. Higher Material Requirements

· Sealing gasket material: IP67 uses standard silicone; IP68 uses fluororubber (aging resistant, corrosion resistant)

· Housing material: Must pass long-term immersion testing; plastics require hydrolysis resistance

3. Higher Testing Costs

· IP67: 30-minute test, sampling acceptable

· IP68: May require 24-hour or even 7-day continuous testing, with higher inspection rates

4. Lower Yield Rates

· IP68 requires extremely high assembly environment standards (cleanroom)

· Tiny burrs or dust particles can cause leakage

6. Selection Guide: Which One Should You Choose?

Choose IP67 If:

✅ Equipment only encounters occasional water exposure (rain, splashes)

✅ Can be retrieved promptly if accidentally dropped in water

✅ Cost-sensitive, no need for continuous submersion

✅ Installation location prevents water accumulation (vertical installation, drainage holes)

Choose IP68 If:

✅ Equipment may be continuously submerged (underwater lights, pumps)

✅ Installed in water-accumulating environments (buried lights, ship bilges)

✅ Higher reliability required (industrial control, medical equipment)

✅ Waterproofing is a key selling point (premium outdoor products)

7. Manufacturer Recommendations: Don't Be Misled by Numbers

1. Check Specifications, Not Just Ratings

IP68 is not a unified standard. Manufacturer A's IP68 might be 1.5m/2 hours, while Manufacturer B's could be 10m/7 days. Always review the detailed specifications.

2. Pay Attention to "Dynamic Water Protection"

Some IP67 switches perform well in static water but fail under high-pressure water jet cleaning. If your equipment will be cleaned with pressure washers, additional consideration is needed.

3. Sealing Structure Matters More Than Ratings

Among switches all rated IP68, some use sealing gaskets, some use potting compound, and others use ultrasonic welding. Potting compound + double-layer sealing is the most reliable combination.

4. Consider Long-Term Aging

Silicone sealing gaskets may age and fail after 3-5 years. Fluororubber has longer service life but higher cost. For long-term outdoor equipment, fluororubber is recommended.

5. Testing Validation Is Essential

No matter how good the specifications, nothing beats actual testing. Recommendations:

· Order small batch samples

· Simulate actual usage environment for testing

· Conduct accelerated aging tests if conditions permit