Highly Saturated Nitrile or HSN is a hydrogenated nitrile, which is an organic cyanide from which ammonia is eliminated to produce acid that is then infused with hydrodgen. HSN is a synthetic compound that provides excellent resistence to motor oil, oxidized fuels and lubricating oils and performs well at high temperatures.

One of the most common HSN products on the market is the humble O-ring. This web site is under construction, but if you would like to buy some HSN O-rings, please visit Lee Seals, The O-ring Store or Rivnut.