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  2. Twinwall plastic - Wikipedia

    en.wikipedia.org/wiki/Twinwall_plastic

    Twin-wall polycarbonate is able to flex in the demanding conditions of four-season greenhouses and allows for consistent temperature management because of the insulative properties. [ 12 ] Twinwall Polycarbonate sheeting is primarily installed with glazing bars, which secure the sheets down to the frame, whether timber, metal or other framing ...

  3. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    Other applications, including polycarbonate sheets, may have the anti-UV layer added as a special coating or a coextrusion for enhanced weathering resistance. Polycarbonate is also used as a printing substrate for nameplate and other forms of industrial grade under printed products. The polycarbonate provides a barrier to wear, the elements ...

  4. Nuclepore filter - Wikipedia

    en.wikipedia.org/wiki/Nuclepore_filter

    A nuclepore filter (brand name Nuclepore from Whatman, part of GE Healthcare) is a kind of filter in which holes a few micrometres in size have been created in a plastic (e.g. polycarbonate) membrane.

  5. Ultimate tensile strength - Wikipedia

    en.wikipedia.org/wiki/Ultimate_tensile_strength

    The ultimate tensile strength of a material is an intensive property; therefore its value does not depend on the size of the test specimen.However, depending on the material, it may be dependent on other factors, such as the preparation of the specimen, the presence or otherwise of surface defects, and the temperature of the test environment and material.

  6. Aspheric lens - Wikipedia

    en.wikipedia.org/wiki/Aspheric_lens

    The world's first commercial, mass-produced aspheric lens element was manufactured by Elgeet for use in the Golden Navitar 12 mm f /1.2 normal lens for use on 16 mm movie cameras in 1956. [12] This lens received a great deal of industry acclaim during its day. The aspheric elements were created by the use of a membrane polishing technique.

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