Ingress Ratings Sold as Marketing against a Real Test Report
Verify ingress claims using ISO IEC 17025 accredited test reports detailing pre and post electrical insulation checks rather than marketing datasheets.
Membrane Breathers
Permeable Cap
Enclosure accessories balance pressure differentials while preventing liquid and particulate contamination. Installed membrane breathers allow air and water vapor to flow through a microporous material while blocking liquid water. This passive venting prevents the buildup of internal pressure or vacuum that can damage housing seals.
The component is limited by its maximum airflow rate and liquid entry pressure.
Pressure Balancing
Rapid temperature changes in outdoor environments create significant pressure differences between the inside and outside of an enclosure. Utilizing membrane breathers relieves this stress by allowing air to move freely across the enclosure boundary. This action prevents the “breathing” effect that draws moisture through standard gaskets when the enclosure cools.
It prolongs the lifetime of the primary seals.
Material Composition
The active element is typically made of expanded polytetrafluoroethylene, which has a highly hydrophobic structure. This means membrane breathers repel liquid water and oil droplets, keeping the venting pores clear of blockages. The membrane is supported by a durable plastic or metallic housing that protects it from physical impact.
This construction ensures long-term performance in harsh environments.
Verification Protocol
Air permeability and water resistance are verified during manufacturing through standardized flow and pressure tests. This ensures quality.