Definition of polysulphide in English:


(also polysulfide)


  • 1Chemistry
    A compound containing two or more sulphur atoms bonded together as an anion or group.

    ‘Thiokol Chemical Corporation produced a synthetic rubber from ethylene dichloride and sodium polysulfide.’
    ‘Approximately 3 lb of calcium carbonate are needed to neutralize the effect of 1 lb of sulfur applied as elemental sulfur or ammonium polysulfide.’
    1. 1.1A synthetic rubber or other polymer in which the units are linked through such groups.
      • ‘The polysulfide degrades, cracks and causes the window to fail and ‘fog up’.’
      • ‘These coatings exhibit the toughness and adhesion of epoxy, with the elasticity and chemical resistance of a polysulfide.’
      • ‘There are three common types: polysulfides, polyurethanes, and silicones.’