The choice of elastomers, rubber parts, in a pump can be very critical to the long-term success of the pump system. Pumptec provides 2 standard choices for their pumps, Buna or Viton.
Buna (NBR, Nitrile) is standard in most pumps and works well in most uses in cleaning and fluid pressurizing applications. This form of synthetic rubber is generally resistant to oil, fuel, and other chemicals (the more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material). Buna o-rings are black.
Viton is a brand of synthetic rubber and fluoropolymer elastomer commonly used in O-rings and other molded extruded goods. It is a trademark of DuPont. Pumptec uses Viton in pumps used in Pest and Lawn spraying because of its resistance to hydrocarbons found in some chemicals. Viton o-rings are brown.
For assistance determining your elastomer needs, check for chemical compatibility at: Cole-Parmer Chemical Compatibility
Not seeing your chemical on the list? Pumptec can offer other elastomers depending on the pump model and purchase quantity. Give Pumptec the opportunity to help you.