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ETFE is effectively the high-strength version of the other three in this group. ETFE film is self-cleaning (due to its nonstick properties) and recyclable. [2] As a film for roofing it can be stretched and still be taut if some variation in size, such as that caused by thermal expansion, were to occur.
In 1938, polytetrafluoroethylene (DuPont brand name Teflon) was discovered by accident by a recently hired DuPont Ph.D., Roy J. Plunkett.While working with tetrafluoroethylene gas to develop refrigerants, he noticed that a previously pressurized cylinder had no pressure remaining.
Vector Foiltec is a business using transparent plastic cushions filled with air as an architectural cladding technology. This solution can be better than glass panels in applications such as roofs over aggressive environments where chemicals would attack a metal window frame, or where the transparent panels have to accommodate deformation due to changing thermal conditions.
The earliest form of eyewear for which any archaeological record exists comes from the middle of the 15th century. It is a primitive pince-nez whose frames were made from two pieces of either metacarpal bone from the forelimb of a bull or large pieces of antler. The pieces were paddle-shaped, and joined by an iron rivet which provided the ...
As a protective film using an adequate adhesive; ECTFE powder is most commonly used in electrostatic powder coating. [11] Such coatings have a typical thickness of 0.8 mm but can be applied up to 2 mm with a special grade for high build up. [12] [full citation needed] [13] [failed verification]
Specialized glasses may be used for viewing specific visual information, for example, 3D glasses for 3D films (stereoscopy). Sometimes glasses are worn purely for fashion or aesthetic purposes. Even with glasses used for vision correction, a wide range of fashions are available, using plastic, metal, wire, and other materials for frames. Most ...
The city’s hated new congestion toll could dangerously delay FDNY response times — meaning the “difference between life and death,” unions repping thousands of Bravest warned Sunday. The ...
Low emissivity (low e or low thermal emissivity) refers to a surface condition that emits low levels of radiant thermal (heat) energy. All materials absorb, reflect, and emit radiant energy according to Planck's law but here, the primary concern is a special wavelength interval of radiant energy, namely thermal radiation of materials.