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Although single layer polycarbonate sheeting is more flexible than polycarbonate in twinwall configuration, it still retains significant advantages over alternative materials, including glass. A typical 6mm sheet has a density of 0.72 g/cm^2 [6] and a thermal insulation R value of 0.3 m^2°C/W, while allowing 80% of visible light pass through. [7]
Thermally processed material is usually totally amorphous, [7] and as a result is highly transparent to visible light, with better light transmission than many kinds of glass. Polycarbonate has a glass transition temperature of about 147 °C (297 °F), [8] so it softens gradually above this point and flows above about 155 °C (311 °F). [9]
In domestic greenhouses, the glass used is typically 3 mm (1 ⁄ 8 in) "horticultural glass" grade, which is good quality glass that should not contain air bubbles (which can produce scorching on leaves by acting like lenses). [42] Plastics mostly used are polyethylene film and multi-wall sheets of polycarbonate material, or PMMA acrylic glass.
Clocking in at 7.8-feet by 6.7-feet, Costco's spacious wooden shed can store plants of all shapes and sizes, yet it's small enough to fit in a breadth of backyards.
The center now has restaurants, bars, banks, an urgent care facility, hardware store, sporting goods store, video game store, pet supply store, Goodwill, a Giant Eagle Market District, and more. In January 2015, Macy's announced that the company was closing three Ohio stores, including the Kingsdale location, by the end of March. [ 5 ]
Traditionally, PMMA (acrylic) comprises the core (96% of the cross section in a fiber 1mm in diameter), and fluorinated polymers are the cladding material. Since the late 1990s much higher performance graded-index (GI-POF) fiber based on amorphous fluoropolymer (poly(perfluoro-butenylvinyl ether), CYTOP [1]) has begun to appear in the marketplace.
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