PTFE film is an ultra-thin material produced from suspension polymerized polytetrafluoroethylene resin through processes such as molding, sintering, and skiving. With a thickness range of 0.01mm to 1mm, it combines the chemical inertness of PTFE with the flexibility of thin-film materials, making it a core functional material in high-end sealing, insulation, and filtration applications.

Core Characteristics

Characteristic	Technical Parameter	Performance Advantage
Thickness Range	0.01-1mm (±0.005mm precision)	Adapts to different packaging needs
Temperature Resistance	-200℃ ~ +260℃ (short-term 300℃)	Wide temperature range stability
Dielectric Strength	100-200kV/mm (at 0.1mm thickness)	Preferred for ultra-high voltage insulation
Air Permeability	0.1-10L/m²·day (expanded film)	Selective permeability
Coefficient of Friction	0.04-0.08	Significant self-lubricating properties

Product Classification

Type	Process Characteristics	Typical Applications
Skived Film	Pure PTFE sintered and skived, thickness ≥0.1mm	Gaskets, Valve discs
Oriented Film	Biaxially stretched, thickness 0.01-0.2mm	Capacitor dielectric, High-frequency CCL
Expanded Film (ePTFE)	Microporous structure, porosity 30-90%	Breathable membranes, Air filtration
Composite Film	Laminated with aluminum foil/non-woven fabric, etc.	Corrosion lining, Electromagnetic shielding

Key Performance Parameters

Parameter	Test Standard	Typical Value
Tensile Strength	ASTM D882	Machine Direction 30-50MPa, Transverse 20-40MPa
Thermal Shrinkage	IPC-TM-650	<1% (260℃/30min)
Pore Size Distribution	ASTM F316	0.1-10μm (expanded film)
Surface Resistance	ASTM D257	>10¹⁶ Ω (Insulation grade)

Application Fields

1. Electronics & Electrical

· High-frequency Substrates: CCL for 5G antennas (Dielectric constant 2.1)

· Insulation Barrier: High-voltage cable wrapping film (Withstand voltage >100kV)

· Case Study: Use of 0.05mm film in an UHV project reduced volume by 40% compared to traditional materials.

2. Medical Protection

Product Type	Performance Requirement	Solution
Surgical Protective Film	Air Permeability >5L/m²·s	25μm ePTFE film + water-repellent treatment
Artificial Blood Vessel	Porosity 60±5%	Gradient pore size ePTFE film

3. Industrial Sealing

· Flange Sealing: 0.1-0.5mm skived film (replacing asbestos gaskets)

· Dynamic Sealing: Graphite-filled film (PV value up to 0.5MPa·m/s)

Processing Guide

1. Cutting Technology

· Laser Cutting: Precision ±0.01mm (suitable for precision electronic components)

· Ultrasonic Cutting: Burr-free (specialized for medical products)

· Maximum Width: 1500mm (can be spliced)

2. Composite Process & Material Comparison

Comparison Item	PTFE Film	PE Film	PI Film
Temperature Resistance	-200~260℃	-60~80℃	-269~400℃
Dielectric Loss	0.0002 (1MHz)	0.001	0.002
Cost	★★★☆☆ (Medium)	★★★★★ (Low)	★★☆☆☆ (High)
Service Life	10-15 years	2-3 years	8-10 years

Quick Selection Guide

Working Condition	Recommended Type	Technical Basis
High-frequency circuit substrate	12μm Oriented Film	Dk=2.1, Df=0.0002
Strong corrosion sealing	0.5mm Skived Film + Graphite filled	Resists 98% H₂SO₄, PV=0.3MPa·m/s
Medical breathable packaging	50μm Expanded Film	Air Permeability 10L/m²·day, Bacterial Filtration Efficiency 100%
Electromagnetic Shielding	Al foil composite film (0.1+0.02mm)	Shielding Effectiveness >60dB (1GHz)

Innovative Applications

1. Smart Films

· Embedded nanowire sensors (monitoring stress/temperature)

· Parameter Range:

  · Pressure Sensing: 0-10MPa

  · Temperature Sensing: -50~300℃

2. Eco-friendly Types

· Recyclable and reprocessable (Recycling rate >85%)

· Biodegradable modified type (Controllable outdoor use cycle)

Certification Standards

Standard	Applicable Type	Key Indicator
UL 94	Electronics & Electrical	V-0 Flame Rating
ISO 10993	Medical Grade	Cytotoxicity ≤ Grade 1
GB/T 13519	Packaging Grade	Moisture Vapor Transmission Rate <5g/m²·24h