Auto Gas LPG

rar-enLPG fuel for automobiles is often a mixture of liquid hydrocarbons with high volatility that would normally be stored under pressure. This product is regulated by the European standard EN 589: 2008 + A1: 2012 which has been approved by CEN (Comité Européen de Normalisation) on 29 June 2008 and includes Amendment 1 approved by CEN on 16 January 2012. CEN members are obliged to respect the Regulation CEN / CENELEC which stipulates the conditions under which this European standard receives the status of a national standard without any changes.

CEN members are the national authorities for standardization from the following countries: Austria, Belgium, Bulgaria, Cyprus, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Ireland, Iceland, Italy, Latvia, Lithuania, Luxembourg, Malta, Great Britain, Norway, Netherlands, Poland, Portugal, Czech Republic, Romania, Slovakia, Slovenia, Spain, Sweden, Turkey and Hungary. This standard defines the requirements that must meet the LPG product used as fuel for cars in Romania and European Union countries.

The basic components of automotive LPG for cars are propane (C3H8) and butane (C4H10), their proportion varies according to season and temperature. For the cold season is generally used a composition with about 60% Propane + 40% Butane or 80% Propane + 20% Butane and for the warm and hot season the composition should be 30/70, 40/60 and 50/50. Below we present the characteristics of the LPG product used as fuel for cars, with minimum or maximum limits:

Characteristic Measure Unit Limits Test Method
Minimum Maximum
Motor octane number, COM 89,00   EN 589-12 (Annex B)
Total content of dienes %mol 0,50 EN 27941
Hydrogen sulfide negative EN ISO 8819
Total sulfur content mg/kg 50,00 ASTM D 6667, ASTM D 3246
Corrosion on copper blade (1h at 40℃) evaluation class 1 EN ISO 6251
Evaporation residue mg/kg 60,00 EN 15470, EN 15471
Vapor pressure, relative, at 40 ℃ kPa 1550,00 EN ISO 4256, EN ISO 8973 and Annex C
Vapour pressure, relative, minimum 150kPa, at temperature:

  • for type A
  • for type B
  • for type C
  • for type D
  • for type E






  • – 10
  • – 5
  • 0
  • + 10
  • + 20
EN ISO 8973 and annex C
Water content   Passes EN 15469
Smell unpleasant and specific at 20% L II EN 589-12 (Annex A)

The winter period in Romania is considered starting from October 1 to April 30 and the summer period starting from May 1 to September 30.