Expo Canopy Made With Flexible Beta Yarn

The World Expo Center's entrance pavilion includes a large structural membrane canopy made with AGY's Beta yarn, which provides flexibility and strength for large-scale architecture. The Beta yarn consists of very fine glass filaments (4um) that are twisted and plied into yarn bundles. 'We supply the raw, non-combustible Beta yarn to Saint-Gobain Performance Plastics, who weaves it into a wide-width [120in] structural fabric and then coats it with a proprietary PTFE formula,' said John Mancinelli, North East sales manager at AGY.

'The finished membrane product, called Sheerfill Architectural Membrane, enables the construction of buildings with stunning architectural profiles,' he added. Saint-Gobain chose AGY's Beta yarn because it retains strength both during and after rigorous processing, and because it retains the flexibility to be bent or folded without losing strength. 'The secret is our very fine Beta glass filaments - they are the smallest diameter available and provide the membrane with maximum flexibility,' added Mancinelli. AGY's glass chemistry allows Saint-Gobain to coat the fabric in such a way that larger micron size filaments or different glass chemistry would reduce the fabric's effectiveness.

The finished PTFE-coated fibreglass fabric is considered a permanent architectural membrane material with a life of more than 25 years. Its translucent nature creates gently diffused glare-free natural lighting, allowing light to pass through the material. During daylight the membrane appears bright white, but is able to block UV light It will not degrade over time and, with the combination of PTFE, it reduces UV radiation within the facility while allowing light to enter. Using the membrane for structural elements also helps reduce overall costs, as architectural membranes weigh less than conventional roofing systems, resulting in reduced structural steel components. The Beta yarn is used for different grades of the Sheerfill architectural membrane.

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