PTFE coated glass or polytetrafluoroethylene, is a Teflon®-coated woven fiberglass membrane that is extremely durable and weather resistant.
The material excels with high transparency and can reflect up to 60% of the sunlight which falls on it and the membranes are water and UV resistant and chemically inactive.
PTFE fabric can be installed in climates ranging from the frigid arctic to the scorching desert heat with a project life in some cases exceeding 30 years. The fiberglass coating is chemically inert, capable of withstanding temperatures from -73°C to +232°C
The low-surface free energy of the material creates a surface which is readily cleaned by rainwater. It is also completely immune to UV radiation.
During scientific tests of its solar properties, it was discovered that PTFE fiberglass membranes reflect as much as 73% of the sun’s energy while holding just seven percent on its exterior surface. Certain grades of PTFE fiberglass can absorb 14% of the sun’s energy while allowing 13% of natural daylight and 7% percent of re-radiated energy (solar heat) to transmit through.
The woven fiberglass gives the PTFE fiberglass membrane its mechanical strength. These filaments, known as beta glass, are the smallest diameter available and provide the membrane with maximum flexibility.
The fibres are drawn from hot melt glass through platinum dies into continuous filament and are then twisted and plied into yarn bundles. The yarns are woven into a wide structural fabric, which is then coated with PTFE fiberglass to complete the process. Under normal conditions, the fabric behaves elastically and does not undergo significant stress relaxation or creep.
PTFE is highly reflective, making it ideal for shade structures, as it can withstand high temperatures (-73°C – 232°C) without transferring much heat. This is the defining feature of PTFE that differentiates it from conventional glazing. Testing has indicated that up to 80% of solar energy is reflected, with an 8% rate of absorption by the fabric itself. Some grades of PTFE however, can absorb up to 14% of solar energy, allowing a 12% rate of transmission through the fabric.
The principal element that differentiates PTFE fiberglass membrane from conventional glazing is its advantageous shading coefficient.
PTFE fabric has the ability to evenly disperse light, reducing the need for additional/artificial lighting throughout the day, and creating a more natural environment.
Given the air permeability and flexibility of PTFE, the sound absorption properties are exceptional. External noise can be isolated to meet the noise criterion of various buildings, while reverberation is directly relative to the internal size of the structure. Acoustics are clearly enhanced for smaller rooms and can be treated to accommodate larger scale environments such as stadiums and aquatic centres.
PTFE fabric offers a low maintenance option, in addition to offering quality, strength and a longevity. With time UV light bleaches the fabric, creating a clean and crisp visual. The self-cleaning properties allow the fabric to resist moisture and decrease cleaning requirements.
Contact us today to discuss your project requirements. We are award winning shade structure specialists, with extensive project experience across most industries.