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  2. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    PMMA transmits up to 92% of visible light (3 mm (0.12 in) thickness), [18] and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm). [3] It filters ultraviolet (UV) light at wavelengths below about 300 nm (similar to ordinary window glass).

  3. Plastic optical fiber - Wikipedia

    en.wikipedia.org/wiki/Plastic_optical_fiber

    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.

  4. Coppergate Helmet - Wikipedia

    en.wikipedia.org/wiki/Coppergate_Helmet

    Seven or eight slots, each between 1.1 mm (0.043 in) and 1.7 mm (0.067 in) wide, were cut for every 25 mm (0.98 in) of the strip. [22] One ring of mail was placed into each slot, and a piece of iron wire 2.5 mm (0.098 in) in diameter was slotted through to hold them in place. [ 23 ]

  5. Preferred metric sizes - Wikipedia

    en.wikipedia.org/wiki/Preferred_metric_sizes

    A standard metric (concrete) block is 190 mm wide, 390 mm long, and 190 mm high, which allows for 10 mm mortar joints in between bricks, giving a standard unit size of 200 mm square by 400 mm long. [3] A standard metric brick is 90 by 57 by 190 mm; with 10 mm of mortar, that produces a standard unit of 100 mm x 200 mm. [3]

  6. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    extrusion with cylinders into sheets (0.5–20 mm (0.020–0.787 in)) and films (below 1 mm (0.039 in)), which can be used directly or manufactured into other shapes using thermoforming or secondary fabrication techniques, such as bending, drilling, or routing. Due to its chemical properties it is not conducive to laser-cutting.

  7. Hillman 14 - Wikipedia

    en.wikipedia.org/wiki/Hillman_14

    Mid-size / Large family car : Body style: ... Holes had been cut in the Minx's body and replaced by Perspex panels. ... [15] it was bored out 6 mm to 2,267 cc for ...

  8. Hoda Kotb Talks Possible Future Wedding Almost 3 Years After ...

    www.aol.com/hoda-kotb-talks-possible-future...

    Hoda Kotb is looking ahead towards a possible wedding in her future.. On the Dec. 11 episode of Today with Hoda and Jenna, Kotb and co-host Jenna Bush Hager discussed the "micro-wedding" trend ...

  9. List of soft contact lens materials - Wikipedia

    en.wikipedia.org/wiki/List_of_soft_contact_lens...

    The first contact lenses were made of glass, in 1888. Initially the glass was blown but soon lenses were made by being ground to shape. For the first fifty years, glass was the only material used. The lenses were thin, yet reports of injury were rare. In 1938 perspex (polymethylmethacrylate, or PMMA) began to replace glass in contact lens ...

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