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The shell of a hockey helmet is generally made of a substance called vinyl nitrile that disperses force from the point of contact, while the liner may be made of either vinyl nitrile foam, expanded polypropylene foam, or other material to absorb the energy, to reduce the chances of concussion. [1]
Hockey helmets come in various sizes, and many of the older designs can also be adjusted by loosening or fastening screws at the side or at the back. Ice hockey helmets are made of a rigid but flexible thermoplastic outer shell, usually nylon or ABS, with firm vinyl nitrile foam padding inside to reduce shocks.
Its molecular structure consists of a vinyl group (−CH=CH 2) linked to a nitrile (−C≡N). It is an important monomer for the manufacture of useful plastics such as polyacrylonitrile. It is reactive and toxic at low doses. [5] Acrylonitrile is one of the components of ABS plastic (acrylonitrile butadiene styrene). [6]
Jofa is a Swedish brand of ice hockey equipment owned by Birch Hill Equity Partners through its portfolio company Sport Maska Inc. The brand originated in the company Jonssons Fabriker AB, later renamed Jofa AB, which was founded in Malung, Sweden in 1926 by Niss Oskar Jonsson (1909–2002).
Polyacrylonitrile (PAN) is a synthetic, semicrystalline organic polymer resin, with the linear formula (CH 2 CHCN) n. [2] Almost all PAN resins are copolymers with acrylonitrile as the main monomer.
Koho is a Finnish brand of ice hockey equipment owned by Birch Hill Equity Partners through its portfolio company Sport Maska Inc. Koho equipment was made originally by the company Koho-tuote Oy, which was founded in 1964 in Forssa, Finland by Kari Aro (1935–2003).
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