The differences between PTFE and PVC tensioned membranes

Application Differences Between PTFE and PVC Tension Membranes in Architecture
The application of PTFE (polytetrafluoroethylene) and PVC (polyvinyl chloride) tension membranes in architecture exhibits significant distinctions, primarily in material properties. The following analysis elaborates on these differences:

I. Material Property Variations

1. Durability and Self-Cleaning

• PTFE Membranes:

  • Composed of a glass fiber substrate coated with PTFE resin, PTFE membranes demonstrate exceptional weather resistance and chemical stability, with a service life of 20–30 years.
  • Their smooth, hydrophobic surface repels dust and contaminants, allowing rainwater to restore cleanliness. They maintain light transmittance and aesthetic appeal over extended use.

• PVC Membranes:

  • Constructed from a polyester fiber substrate with PVC coating, PVC membranes exhibit lower durability, typically lasting 7–15 years (enhanced variants: 15–30 years).
  • Prone to dust accumulation, they require regular cleaning to prevent reduced light transmission and visual degradation.

2. Light Transmittance and Optical Effects

• PTFE Membranes:

  • Transmittance ranges from 5% to 15%, producing soft, diffused light without glare, ideal for spaces requiring uniform illumination (e.g., stadiums, exhibition halls).

• PVC Membranes:

  • Transmittance can reach 8%–25%, but additives or coatings may reduce clarity. Light transmission may create direct glare, necessitating design adjustments to mitigate visual discomfort.

3. Fire Resistance and Safety

• PTFE Membranes:

  • Meet or exceed international fire safety standards (e.g., China’s GB8624 B1, US NFPA701), featuring no dripping and low smoke emission during combustion.

• PVC Membranes:

  • Require flame-retardant additives or coatings to improve fire resistance. High temperatures may release hazardous gases, demanding strict compliance with safety protocols.

4. UV Resistance and Aging Performance

• PTFE Membranes:

  • Reflect over 95% of UV radiation, ensuring minimal aging during prolonged outdoor exposure.

• PVC Membranes:

  • Depend on PVDF (polyvinylidene fluoride) coatings for UV protection. Long-term UV exposure may still cause coating delamination or substrate embrittlement.

5. Flexibility and Construction Adaptability

• PTFE Membranes:

  • Rigid glass fiber substrate provides high tensile strength but limited flexibility, requiring precise cutting and pretension design. Installation complexity is higher.

• PVC Membranes:

  • Soft polyester fiber substrate allows easy stretching and folding, accommodating complex curvatures and temporary structures with simplified installation.