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2. Polycarbonate - Wikipedia

   en.wikipedia.org/wiki/Polycarbonate

   Na 2 (OC 6 H 4) 2 CMe 2 + COCl 2 → 1/n [OC(OC 6 H 4) 2 CMe 2] n + 2 NaCl. In this way, approximately one billion kilograms of polycarbonate is produced annually. Many other diols have been tested in place of bisphenol A, e.g. 1,1-bis(4-hydroxyphenyl)cyclohexane and dihydroxybenzophenone. The cyclohexane is used as a comonomer to suppress ...

3. Twinwall plastic - Wikipedia

   en.wikipedia.org/wiki/Twinwall_plastic

   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] These attributes, coupled with a service temperature range in excess of 120 °C (-51 °C to 71 °C), makes polycarbonate the ideal material for twinwall application.

4. Tritan copolyester - Wikipedia

   en.wikipedia.org/wiki/Tritan_copolyester

   Tritan, a copolymer offered by the Eastman Chemical Company since 2007, is a transparent plastic intended to replace polycarbonate, because of health concerns about Bisphenol A (BPA). [1] [2] Tritan is a copolymer made from three monomers: dimethyl terephthalate (DMT), cyclohexanedimethanol (CHDM), and 2,2,4,4-Tetramethyl-1,3-cyclobutanediol ...

5. Knoop hardness test - Wikipedia

   en.wikipedia.org/wiki/Knoop_hardness_test

   The geometry of this indenter is an extended pyramid with the length to width ratio being 7:1 and respective face angles are 172 degrees for the long edge and 130 degrees for the short edge. The depth of the indentation can be approximated as 1/30 of the long dimension. [1] The Knoop hardness HK or KHN is then given by the formula:

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7. Carbonate ester - Wikipedia

   en.wikipedia.org/wiki/Carbonate_ester

   The unique O=C bond is short (1.173 Å in the depicted example), while the C-O bonds are more ether-like (the bond distances of 1.326 Å for the example depicted). [ 1 ] Carbonate esters can be divided into three structural classes: acyclic, cyclic, and polymeric.