Hermetic Feedthrough Testing Methods You Should Know

Hermetic feedthroughs are critical components in electronics, aerospace, medical devices, and industrial systems. They allow electrical, optical, or fluid connections to pass through a sealed barrier while maintaining airtight or vacuum integrity. To ensure reliability and performance, hermetic feedthroughs must undergo rigorous testing. Leading brands like PAVE Technology follow precise testing methods to guarantee that their feedthroughs meet the highest standards.

Why Testing Hermetic Feedthroughs is Important

Hermetic feedthroughs operate in environments where leaks, electrical failure, or mechanical stress can compromise system performance. Proper testing ensures:

• Leak-tight performance: Prevents moisture, dust, or gases from entering sealed systems
  
• Electrical integrity: Maintains signal transmission and prevents shorts or high resistance
  
• Mechanical durability: Confirms resistance to vibration, thermal cycling, and pressure changes
  

PAVE Technology incorporates testing into every step of manufacturing, ensuring feedthroughs perform reliably in even the harshest conditions.

Common Hermetic Feedthrough Testing Methods

1. Helium Leak Testing

Helium leak testing is one of the most widely used methods to verify hermeticity. Helium gas, due to its small atomic size, can detect minute leaks in the seal.

Procedure:

• The feedthrough is placed in a vacuum chamber.
  
• Helium gas is applied externally or internally.
  
• A mass spectrometer detects any helium escaping from the seal.
  

Advantages: Highly sensitive and accurate for detecting micro-leaks.

PAVE Technology performs helium leak testing to ensure each feedthrough meets stringent vacuum and sealing standards.

2. Bubble or Immersion Testing

Bubble testing involves immersing the feedthrough in a liquid and applying pressure to check for escaping air bubbles, indicating leaks.

Advantages:

• Simple and cost-effective
  
• Useful for preliminary testing
  

Limitations: Less sensitive than helium leak testing; best used for low-pressure applications.

3. Electrical Testing

Electrical tests verify the insulation, continuity, and resistance of a hermetic feedthrough:

• Insulation resistance testing: Ensures no electrical leakage between pins or to the housing
  
• Continuity testing: Confirms that electrical paths are complete
  
• High-voltage testing: Checks feedthrough performance under rated voltage
  

PAVE Technology combines electrical and hermetic testing to ensure feedthroughs perform reliably in critical applications.

4. Pressure and Vacuum Testing

Feedthroughs are subjected to pressure differentials to confirm mechanical and seal integrity:

• Vacuum testing: Simulates operating conditions in vacuum chambers or aerospace applications
  
• Pressure testing: Ensures feedthroughs withstand high-pressure environments without deformation or leakage
  

PAVE Technology uses precise pressure testing equipment to validate performance in extreme conditions.

5. Thermal Cycling and Mechanical Stress Testing

Thermal cycling and vibration tests simulate real-world operational stresses to ensure long-term reliability.

Procedures include:

• Exposing feedthroughs to alternating high and low temperatures
  
• Applying mechanical vibrations or shocks
  
• Monitoring for leaks, seal degradation, or electrical failure
  

Feedthroughs from PAVE Technology are designed to withstand rigorous thermal and mechanical testing, ensuring durability in harsh environments.

Best Practices for Hermetic Feedthrough Testing

1. Use certified testing equipment for leak and electrical testing.
   
2. Combine multiple methods to verify both hermetic and electrical integrity.
   
3. Perform regular inspections during production and after installation.
   
4. Document results for quality control and compliance purposes.
   
5. Work with trusted brands like PAVE Technology that follow rigorous testing protocols.
   

Conclusion

Proper testing is essential to guarantee the reliability, performance, and longevity of hermetic feedthroughs. Methods such as helium leak testing, electrical testing, pressure and vacuum tests, and thermal cycling help engineers identify and prevent potential failures.

For high-quality, rigorously tested hermetic feedthroughs, PAVE Technology provides precision-engineered solutions trusted across electronics, aerospace, medical, and industrial applications. Their commitment to thorough testing ensures dependable performance in the most demanding environments.