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  2. Arai Helmet - Wikipedia

    en.wikipedia.org/wiki/Arai_Helmet

    And so 22-06 tests incorporate impacts against an anvil with a 45-degree angle. Extra sensors measure the twisting forces transmitted through the helmet to the rider's head. It was expected that under this particular test, rounder, smoother shells would perform better, and the first helmet to pass the new ECE 22.06 test was an Arai: the Quantic ...

  3. Motorcycle helmet - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_helmet

    The Snell Memorial Foundation recently certified a flip-up helmet for the first time. [17] [18] ECE 22.05 allows certification of modular helmets with or without chin bar tests, distinguished by -P (protective lower face cover) and -NP (non-protective) suffixes to the certification number, [19] and additional warning text for non-certified chin ...

  4. Group 12 element - Wikipedia

    en.wikipedia.org/wiki/Group_12_element

    Group 12, by modern IUPAC numbering, [1] is a group of chemical elements in the periodic table. It includes zinc (Zn), cadmium (Cd), mercury (Hg), [ 2 ] [ 3 ] [ 4 ] and copernicium (Cn). [ 5 ] Formerly this group was named IIB (pronounced as "group two B", as the "II" is a Roman numeral ) by CAS and old IUPAC system.