Airflow Performance & Testing Standards
Precise airflow is critical for pressure equalization. Ventrase utilizes industry-standard testing protocols to ensure our ePTFE membranes provide consistent, reliable performance under diverse environmental conditions.
Understanding Airflow Metrics
To ensure optimal venting, we measure airflow performance using two globally recognized standards. Understanding these metrics helps in selecting the right membrane for your specific application:
Gurley Airflow Test
Measures the time (in seconds) required for a specific volume of air to pass through a defined area of the membrane. Lower Gurley numbers indicate higher airflow.
Frazier Airflow Test
Measures the volume of air (usually in cfm/ft² or L/min/cm²) passing through the membrane at a constant pressure differential. Higher Frazier numbers indicate higher airflow.
Typical Performance Characteristics
| Membrane Grade | Gurley (s/100cc) | Frazier (cfm/ft²) |
|---|---|---|
| High-Flow Industrial | 5 – 15 | 10 – 25 |
| Standard Protective | 20 – 50 | 3 – 8 |
| High-Efficiency Barrier | 80+ | < 1 |
Need Performance Verification?
Our lab provides detailed airflow and pressure testing reports for your specific application requirements.
Request Test DataAirflow Performance FAQ
Why is the difference between Gurley and Frazier values important?
Gurley and Frazier tests measure airflow from different perspectives (time vs. rate). Understanding both allows us to select a membrane that balances rapid pressure relief with necessary particle/liquid barrier protection for your specific application environment.
How does membrane thickness affect airflow?
Generally, increasing the thickness of an ePTFE membrane increases the airflow resistance. Our engineers balance thickness to maintain high airflow rates while ensuring the mechanical strength required for your industrial packaging.
Can environmental factors affect airflow performance?
Yes. Factors such as temperature, humidity, and the presence of oils or chemicals can influence membrane permeability. We recommend testing your chosen membrane under simulated operational conditions to ensure consistent performance.
Do you provide customized airflow testing?
Yes. We can perform application-specific airflow testing, including tests with your actual product fluids, to confirm that the selected vent membrane meets your real-world performance requirements.