1. Why IP rating matters for connector selection

Waterproof connectors are commonly used in outdoor electronics, industrial equipment, sensors, lighting systems, monitoring devices, and harsh environment applications.

The IP rating helps define the protection level against dust and water. However, choosing a waterproof connector should not rely only on the IP number. The installation method, mating condition, cable sealing, and real operating environment are equally important.

2. What IP67 means

IP67 generally means the connector provides dust-tight protection and can withstand temporary immersion under defined conditions.

IP67 connectors are commonly used for:

  • Outdoor electronic devices
  • Industrial sensors
  • Equipment exposed to rain or splashing water
  • Temporary wet environments
  • Panel-mounted equipment
  • General waterproof cable connections

IP67 is often suitable when the connector may be exposed to moisture, water spray, or short-term immersion, but not continuous underwater operation.

3. What IP68 means

IP68 generally indicates a higher water protection level than IP67, but the exact test condition may vary depending on the manufacturer and product design.

IP68 connectors are often selected for:

  • Harsh outdoor environments
  • Long-term wet conditions
  • Equipment exposed to stronger water pressure
  • Applications requiring higher sealing reliability
  • Waterproof cable assemblies
  • Outdoor monitoring and sensor systems

Before choosing IP68, engineers should confirm the actual test depth, test duration, and whether the rating applies to the mated connector, unmated connector, or complete cable assembly.

4. IP67 vs IP68: what should engineers compare?

The difference is not only the number.

Engineers should compare:

  • Water exposure type
  • Immersion depth
  • Immersion duration
  • Operating temperature
  • Cable sealing method
  • Panel sealing structure
  • Mated or unmated waterproof status
  • Dust cap requirement
  • Long-term aging of sealing parts
  • Installation torque or locking method

A connector marked IP68 may still fail if the cable end, panel seal, or mating condition is not properly controlled.

5. Mated condition vs unmated condition

This is a critical point.

Many waterproof connectors are rated when properly mated. If the connector is disconnected in the field, the exposed interface may not remain waterproof unless a protective cap is used.

Engineers should confirm:

  • Is waterproofing required only when mated?
  • Is the connector exposed when unmated?
  • Is a dust cap or sealing cap required?
  • Is the device cleaned with water spray?
  • Will the connector be operated outdoors?

For outdoor applications, protective caps and sealing accessories should be considered during design.

6. Cable-side sealing is just as important

A waterproof connector is only one part of the sealing system. The cable side must also be properly designed.

Important points:

  • Cable outer diameter match
  • Sealing gland compatibility
  • Overmolded cable option
  • Cable jacket material
  • Strain relief
  • Cable bending after installation
  • Long-term compression of sealing parts

If the cable diameter does not match the sealing structure, the connector may not reach the expected waterproof performance.

7. Locking structure and installation environment

Waterproof connectors commonly use threaded locking, push-pull locking, or other secure locking structures.

Selection points:

  • Is frequent mating required?
  • Is the connector installed in a narrow space?
  • Is vibration present?
  • Is installation torque controlled?
  • Is tool-free operation required?
  • Is panel mounting required?

Threaded waterproof connectors are often suitable for stable outdoor or industrial installation. Push-pull waterproof connectors can be suitable when faster operation is required.

8. When to choose IP67

IP67 may be suitable when:

  • The equipment is used outdoors but not underwater
  • The connector is exposed to rain, moisture, or short-term splashing
  • The installation environment is controlled
  • Cost and size need to be balanced
  • The connector remains properly mated during operation

9. When to choose IP68

IP68 may be suitable when:

  • The environment is harsher
  • The connector may face longer water exposure
  • Higher sealing reliability is required
  • The equipment is used in outdoor monitoring, sensors, or industrial field systems
  • A complete waterproof cable assembly is required

Choosing between IP67 and IP68 should be based on the actual application, not only the rating number. Engineers should review water exposure, mated condition, cable sealing, panel installation, locking method, and long-term reliability before making a decision.

GLOBIX provides waterproof connectors and waterproof cable assembly support for industrial, sensor, outdoor electronic, and harsh environment applications.

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