Material Types and Specification System

Type	Thickness Range (μm)	Width Range (mm)	Production Method	Microstructure	Microstructure
Skived Film	20-1000	50-1000	Compression Sintering + Skiving	Dense, Non-porous	High Density, High Mechanical Strength, Good Electrical Insulation
Oriented Film	10-200	10-1000	Biaxial Stretching	Oriented Microporous	Anisotropic, High Tensile Strength, Controllable Breathability
Expanded Film (ePTFE)	10-500	10-1500	Expanded Stretching	3D Network Porous	Strong & Flexible, Breathable & Waterproof, Composite-ready
Colored Film	30-300	100-1000	Pigment Addition	Dense/Porous	For Identification, Good Color Fastness at High Temperatures
Composite Film	15-1000	50-2000	Lamination with Other Materials	Multilayer Structure	Integrated Functions, Improved Processability
Microporous Filter Film	50-200	100-1000	Special Stretching Process	Controlled Pore Size	Filtration Precision 0.1-10μm

Technical Parameters and Performance Indicators

Physical and Mechanical Properties

Performance Indicator	Skived Film	Oriented Film	Expanded Film (ePTFE)	Test Standard
Density (g/cm³)	2.15-2.20	1.2-2.0	0.2-1.2	GB/T 1033
Tensile Strength (MPa) MD/TD	20-40 / 20-40	30-80 / 10-30	10-50 / 5-25	GB/T 1040
Elongation at Break (%) MD/TD	200-400 / 200-400	50-200 / 200-500	100-400 / 100-400	GB/T 1040
Tear Strength (N/mm)	40-100	20-80	10-60	GB/T 16578
Air Permeability (L/m²·s)	0	10-1000	1-10000	GB/T 5453

 Thermal and Electrical Properties

Surface and Interfacial Properties

Performance Indicator	Value Range	Test Method
Water Contact Angle (°)	105-115	Sessile Drop Method
Surface Tension (dynes/cm)	18.5	Critical Surface Tension Method
Dynamic Friction Coefficient (against steel)	0.04-0.10	Friction Tester
Peel Strength (N/25mm)	0.5-5.0 (after treatment)	GB/T 2792

Typical Application Fields

Application Field	Specific Uses	Recommended Type / Thickness	Key Requirements
Sealing Applications	Flange Gaskets, Valve Seals, Pump Seals	Skived Film / Expanded Film 0.1-1.0mm	Compression Resilience, Creep Resistance, Media Resistance
Filtration Applications	High-Temp Flue Gas Filtration, Chemical Filtration, Air Dust Removal	ePTFE Laminated Filter Media 50-200μm	Filtration Precision, Air Permeability, Temperature Resistance
Electrical Insulation	High-Temp Cable Insulation, Transformer Interlayer Insulation, Capacitor Film	Oriented Film / Skived Film 25-100μm	High Dielectric Strength, Low Loss, Corona Resistance
Non-Stick Applications	Cookware Non-Stick Coating, Mold Release Layers, Roller Covering	Skived Film 0.05-0.5mm	Smooth Surface, High Temp Resistance, Non-Migratory
Medical Applications	Artificial Blood Vessels, Protective Clothing, Medical Breathable Membranes	ePTFE Film 10-100μm	Biocompatibility, Breathable & Bacteria-proof, Sterilizable
Aerospace & Aviation	Spacesuit Materials, Radomes, High-Temp Resistant Cables	Composite Reinforced Film 50-300μm	Extreme Temperature Adaptability, Radiation Resistance, High Reliability
Construction Applications	Waterproof & Breathable Membranes, Membrane Structure Materials, Roof Waterproofing	ePTFE Film 0.1-0.5mm	Weather Resistance, Breathable & Waterproof, Anti-Aging

Processing and Lamination Guidelines

 1. Cutting and Slitting

- Tool Selection: Sharp carbide tools with a blade angle of 15-30°.

- Cutting Methods: Shearing, die-cutting, laser cutting (requires specific parameters).

- Slitting Key Points: Precise tension control to prevent stretching deformation.

- Cleanliness Requirements: Clean cutting environment to avoid contaminating the film surface.

2. Surface Treatment (to Improve Adhesion)

Treatment Method	Principle	Effect Duration	Applicable Film Types
Sodium-Naphthalene Treatment	Chemical Etching of Surface	Permanent	Skived Film, Oriented Film
Plasma Treatment	Surface Activation	Hours to Days	All Types
Radiation Grafting	Introducing Polar Groups onto Surface	Permanent	All Types
Primer Treatment	Coating with Special Primers	Depends on Primer	All Types

3. Lamination Processing

- Hot Press Lamination: Temperature 330-380°C, Pressure 1-10 MPa, Time 30-300s.

- Adhesive Bonding: Requires special adhesives for fluoroplastics (e.g., fluororubber adhesives).

- Melt Lamination: Co-lamination with thermoplastic fluoropolymers (e.g., PFA, FEP).

- Sewing/Welding: Used in special cases, requires specialized equipment.

Selection Decision Matrix

Application Scenario	Primary Performance Requirement	Recommended Film Type	Thickness Suggestion	Processing Key Points
High Temp & High Pressure Sealing	Creep Resistance, Media Resistance, Resilience	Filled Expanded PTFE Film	0.5-3.0mm	High cutting precision, flat surface
High-Efficiency Filtration	Filtration Precision, Air Permeability, Dust Release	ePTFE Laminated Filter Media	50-200μm	Strong lamination to substrate, uniform pore size.
High-Frequency Circuit Substrate	Low Dielectric Constant, Low Loss, Dimensional Stability	Oriented PTFE Film	25-100μm	Clean copper foil lamination, no contamination.
Medical Devices	Biocompatibility, Breathability, Sterilizability	ePTFE Film	10-100μm	Cleanroom processing, pyrogen-free.
Building Waterproofing	Weather Resistance, Breathable & Waterproof, Anti-Aging	ePTFE Construction Membrane	0.2-0.5mm	High welding strength, proper joint treatment.
Release Applications	Non-Stick Property, Temperature Resistance, Smooth Surface	Skived PTFE Film	0.05-0.3mm	Scratch-free surface, tight adhesion.
Corrosion Lining	Comprehensive Corrosion Resistance, Impermeability, Ease of Installation	Composite Reinforced PTFE Film	0.5-2.0mm	Proper seam treatment, no pinholes.

Industry Customized Solutions

 1. Environmental Protection & Dust Removal Industry

- Requirements: High-temperature flue gas filtration, efficient dust release, long service life.

- Solution: ePTFE laminated filter bags with pore sizes of 0.3-3μm.

- Applications: Waste incineration, cement kilns, steel sintering flue gas dust removal.

 2. 5G Communication Industry

- Requirements: High-frequency low loss, dimensional stability, weather resistance.

- Solution: Ceramic-filled PTFE composite film with controllable dielectric constant.

- Applications: Base station antennas, high-frequency circuit boards, microwave devices.

 3. New Energy Battery Industry

- Requirements: Electrolyte resistance, insulation, breathable & explosion-proof.

- Solution: Multi-layer composite PTFE film combining barrier and breathability functions.

- Applications: Lithium battery separators, fuel cell proton exchange membrane substrates.

 4. Semiconductor Manufacturing

- Requirements: Ultra-high purity, low extractables, resistance to high-purity chemicals.

- Solution: Electronic grade PTFE film with metal ion content <1 ppb.

- Applications: Wet process tank linings, high-purity chemical delivery pipelines.

5. Biomedical Industry

- Requirements: Sterilizability, cytocompatibility, controlled permeability.

- Solution: ePTFE films with graded pore sizes, surface bio-modified.

- Applications: Tissue engineering scaffolds, drug-controlled release membranes, blood filtration.

 Storage and Maintenance

 Storage Conditions

- Environment: Store indoors away from light, heat sources, and chemicals.

- Temperature: Room temperature is ideal; avoid prolonged storage above 40°C.

- Stacking: Store flat or rolled, avoid heavy pressure and sharp folding.

- Shelf Life: Theoretically indefinite, but use within 5 years is recommended.

Usage and Maintenance

- Cleaning Methods: Wipe with solvents like alcohol or acetone; avoid mechanical scratching.

- Performance Inspection: Periodically check thickness, strength, and surface condition.

- Repair Possibility: Small area damage can be patched by welding or bonding; large areas need replacement.

- Life Assessment: Under normal operating conditions, service life can reach 10-30 years.

Development Trends

 Technical Development Directions

1. High Performance: Development of nano-enhanced PTFE films, increasing strength by 2-3 times.

2. Functional Composites :Multi-functional PTFE composite films with conductivity/thermal conductivity/antibacterial properties.

3. Controlled Microstructure: Gradient films with precisely controlled pore size and porosity.

4. Green Processing: Reducing processing aids, developing water-based treatment processes.

Market Application Expansion

1. Hydrogen Energy Industry: Fuel cell proton exchange membranes, hydrogen purification membranes.

2. Marine Engineering: Seawater desalination membranes, marine anti-corrosion membranes.

3. Wearable Devices: Flexible electronic substrates, waterproof and breathable fabrics.

4. Internet of Things (IoT): 5G/6G high-frequency materials, sensor protection films.

As the thin-film form of the "Plastic King," PTFE film plays an irreplaceable role in demanding environments such as high-end sealing, efficient filtration, electrical insulation, medical implants, and aerospace applications, thanks to its ultimate chemical stability, ultra-wide temperature range, unique non-stick characteristics, and excellent electrical insulation properties. With advancements in materials science and the development of high-end manufacturing, PTFE film is evolving towards higher performance, finer structures, and more integrated functionalities. Correct type selection and matching, professional processing, and standardized maintenance are key to ensuring optimal performance of PTFE film. In the future, PTFE film is destined to open up broader application prospects in strategic emerging industries such as new energy, electronic information, and biomedicine.