Gas Permeable Membrane: Temperature Range -40°C to 150°C

Component Specifications

Definition

A specialized membrane engineered to permit controlled diffusion of specific gases (e.g., oxygen, carbon dioxide, nitrogen) while preventing the passage of liquids, particulates, and other gases. It functions as a critical interface in protective housings or probes, enabling gas sensing, pressure equalization, or environmental isolation in industrial systems.

Working Principle

Operates via selective permeability, where gas molecules diffuse through microscopic pores or dissolve into the membrane material based on factors like molecular size, solubility, and partial pressure gradients, while liquid surface tension and larger particles are blocked.

Materials

Typically made from hydrophobic polymers such as polytetrafluoroethylene (PTFE), expanded PTFE (ePTFE), polypropylene (PP), or silicone. May include composite layers with specific pore sizes (e.g., 0.1–10 μm) and coatings for chemical resistance or enhanced selectivity.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pore Size	0.2–5.0 μm
Thickness	50–200 μm
Burst Pressure	>3 bar
Hydrophobicity	Water entry pressure >1 bar
Temperature Range	-40°C to 150°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2942, ISO 4548-12, DIN 24550

Parent Products

This component is used in the following industrial products

Protective Housing/Probe

A protective enclosure and sensing element assembly for oxygen sensors/analyzers.

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Engineering Analysis

Risks & Mitigation

Clogging from particulates
Chemical degradation
Hydrophobicity loss over time
Incorrect pore size leading to gas selectivity issues

FMEA Triads

Trigger: Accumulation of contaminants or moisture
Failure: Reduced gas permeability or complete blockage
Mitigation: Implement regular maintenance, use pre-filters, and select membranes with anti-fouling coatings.

Trigger: Exposure to incompatible chemicals or extreme temperatures
Failure: Material degradation or membrane rupture
Mitigation: Specify chemically resistant materials (e.g., PTFE) and operate within rated temperature and pressure limits.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Pore size tolerance ±10%, thickness tolerance ±5%

Test Method

Bubble point test (ISO 2942), air permeability test, and chemical resistance validation per ASTM F316

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Gas Permeable Membrane

Manufacturer profiles associated with Gas Permeable Membrane.

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Frequently Asked Questions

What is the primary function of a gas permeable membrane in a protective housing?

It allows gases to pass for functions like pressure equalization or sensor exposure while blocking liquids, dust, and contaminants to protect internal components.

How do I select a gas permeable membrane for harsh chemical environments?

Choose materials like PTFE or ePTFE for high chemical resistance, and verify compatibility with specific chemicals, temperature ranges, and pressure requirements.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Gas Permeable Membrane