Differences between PTFE and ETFE membrane materials

PTFE and ETFE membrane materials differ significantly in terms of mechanical properties, processing characteristics, light transmission, weather resistance, cost, and application scenarios. The specific differences are as follows:

1. Mechanical Properties
PTFE membrane: Uses a fiberglass base coated with PTFE; it offers high strength and rigidity but has limited flexibility, requiring care to avoid excessive bending during installation. Its tensile strength approaches that of steel, making it suitable for structures subject to sustained loads.
ETFE membrane: Formed directly from an ethylene-tetrafluoroethylene copolymer without a base substrate; it is tougher than PTFE and offers superior impact and tear resistance, though its tensile and tear strengths are slightly lower than those of PTFE.
2. Processing Characteristics
PTFE membrane: Difficult to process, requiring specialized tools and techniques; seams are typically joined via heat welding or mechanical stitching, resulting in higher construction costs.
ETFE membrane: Excellent formability; it can be processed using thermoplastic methods (such as extrusion or injection molding) and easily shaped into complex forms. Seams are usually joined via high-frequency welding, allowing for greater construction efficiency.
3. Light Transmission
PTFE membrane: Lower light transmission (10%–50%) and high reflectivity (70%–80%); it diffuses natural light evenly, preventing glare and harsh shadows.
ETFE membrane: Extremely high light transmission (up to 95%); often called "soft glass," it maximizes natural light usage and reduces energy consumption for artificial lighting. Light transmission can be adjusted to 50% through surface printing.
4. Weather Resistance
PTFE membrane: Excellent weather resistance; it resists degradation from long-term exposure to UV radiation, atmospheric pollution, and extreme temperature fluctuations, with a service life exceeding 25 years.
ETFE membrane: Good weather resistance; it withstands UV radiation, chemical corrosion, and extreme temperature changes, with a service life of at least 25 years.
5. Price and Cost
PTFE membrane: High material and processing costs result in a significant initial investment, but low maintenance costs make it suitable for permanent structures intended for long-term use. ETFE membrane material: Material costs are relatively low, but the operating and maintenance expenses for inflation equipment are high, as is the initial investment; it is suitable for projects requiring high light transmission.
6. Suitable Applications
PTFE membrane material: Suitable for permanent structures such as large stadiums, airport terminals, and high-speed railway stations—settings that specifically require high strength and durability.
ETFE membrane material: Suitable for pneumatic membrane structures, building facades, and projects requiring high light transmission, such as agricultural greenhouses and curved roofs for art galleries. Its lightweight nature also makes it an ideal material for retractable roof structures.