SARA is an analysis method that devides bitumen components according to their polarizability and polarity.


SARA, weight in %

  • saraAsphaltenes
  • saraResins
  • saraAromatics
  • saraSaturates


or in other words saturated hydrocarbons or alkanes or paraffins are present with 5–15 weight-%. Examples: Ethane, Butane, Propane


or aromatic hydrocarbons (PAH) are present with up to 30–45 %. Example: Benzene and multipe combinations hereof


or hydrocarbon resins as they are used in varnishes and adhesives are present with 30–45 % and function as stabiliser for the asphaltenes. Examples: Polyurethane und other resins


Asphaltenes again are a very complex moleculare structure by itself of Carbon, hydrogen, nitrogen, oxygen, sulphur, vanadium and nickel. Through their structural network they serve as a kind of reinforcement  and strongly influence the viscosity.  They are present with 5–20 %.

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