Porous Plastic Components

Porous Plastic Components

Porous PE, UHMWPE and PTFE Components for Filtration, Venting, Diffusion and Flow Control

CMI manufactures a wide range of sintered porous plastic components for applications in medical devices, laboratory instruments, consumer products, industrial filtration, and gas–liquid management systems.

These components are produced from UHMWPE, PE, and PTFE using controlled sintering and molding processes, resulting in uniform pore structures, excellent chemical resistance, and high design flexibility.

CMI porous plastics are widely used as frits, breathers, filters, diffusers, wicks, silencers, restrictors, humidifier elements, and custom-molded parts, serving as cost-effective and high-performance alternatives to POREX® porous plastic components.

Custom manufacturing based on drawings or functional requirements is fully supported.

Key Features & Advantages

• Uniform pore structure with consistent permeability
• Lightweight and corrosion-resistant
• Excellent chemical stability and inertness
• Suitable for medical and food-contact applications
• High breathability and gas diffusion efficiency
• Long service life with stable performance
• Capable of complex shapes through molding
• Tight dimensional tolerances achievable
• Hydrophobic or hydrophilic surface options available

Available Materials

UHMWPE (Ultra-High Molecular Weight Polyethylene)

• Excellent chemical resistance and durability
• Widely used in medical, laboratory, and industrial applications
• FDA-compliant grades available

PE (Polyethylene)

• Cost-effective and versatile material
• Suitable for consumer products, venting, and diffusion applications

PTFE (Polytetrafluoroethylene)

• Superior chemical resistance and thermal stability
• Hydrophobic by nature
• Suitable for aggressive chemical environments

Typical Forms & Capabilities

Porous Plastic Discs / Frits

• Used in chromatography systems, analytical instruments, and filtration devices
• Precise pore-size control and high purity
• Hydrophobic or hydrophilic options available
• Thickness: 0.5 – 10 mm

Porous Plastic Tubes / Rods

• Used for venting, diffusion, humidification, and fluid transport
• Uniform pore distribution and stable airflow
• Length up to 1000 mm (depending on process)

Breathable Vents & Protective Components

• Used in batteries, sensors, electronics, and packaging
• Hydrophobic designs for moisture protection
• Available in caps, plugs, discs, rings, and sheets

Wicks & Fluid Management Components

• Used in humidifiers, aroma diffusers, and medical devices
• Controlled capillary action and consistent liquid transport
• Custom geometries available

Custom-Molded Components

• Manufactured based on drawings, 3D models, or functional requirements
• Complex shapes and assemblies available
• Multi-layer and graded pore structures supported

Typical Applications

Medical & Healthcare

• IV filters and vent components
• Hydrophobic caps and protective elements
• Nebulizer and aerosol components
• Diagnostic and medical devices

Analytical & Laboratory

• Chromatography frits
• Sample preparation systems
• Gas and solvent filtration

Consumer Products

• Aroma diffusers and humidifier wicks
• Cosmetic applicators
• Water and air purification devices

Industrial & Chemical

• Battery vents and breather plugs
• Fuel tank venting systems
• Chemical container venting

Electronics & Sensors

• MEMS sensor protection
• Pressure equalization vents

Customization & OEM Capabilities

• Custom pore size distribution (5 – 200 μm)
• Custom shapes via sintering or molding
• Hydrophobic / hydrophilic surface treatment
• Tight tolerance machining
• Custom colors, branding, and packaging
• Reverse engineering for POREX® equivalents

Why Choose CMI

• Expertise in both porous metal and porous plastic technologies
• OEM-focused manufacturing with consistent quality
• Advanced molding and sintering capabilities
• Proven alternative to POREX® porous plastic components
• Fast prototyping and reliable production