2. Technical data on fuels for testing spark ignition engines 2.1. Type: Petrol (E10) Parameter Unit Limits1 Test method2 Minimum Maximum Research octane number, RON 91.0 98.0 EN ISO Motor octane number, MON 83.0 89.0 EN ISO 5163:20053 Density at 15 °C kg/m3 743 756 EN ISO 3675 EN ISO 12185 Vapour pressure kPa 45.0 60.0 EN ISO 13016-1 (DVPE) Water content Max 0.05 per cent v/v Appearance at -7°C: clear and bright EN 12937 Distillation: - evaporated at 70 °C per cent v/v 18.0 46.0 EN-ISO 3405 - evaporated at 100 °C per cent v/v 46.0 62.0 EN-ISO 3405 - evaporated at 150 °C per cent v/v 75.0 94.0 EN-ISO 3405 - final boiling point °C 170 210 EN-ISO 3405 Residue per cent v/v — 2.0 EN-ISO 3405 Hydrocarbon analysis: - olefins per cent v/v 3.0 18.0 EN EN 15553 - aromatics per cent v/v 19.5 35.0 EN 14517 EN 15553 - benzene per cent v/v — 1.0 EN 12177 EN 238, EN 14517 - saturates per cent v/v Report EN EN 15553 Carbon/hydrogen Report Carbon/oxygen ratio Report Induction period4 minutes 480 EN-ISO 7536 Oxygen content5 per cent m/m 3.38 3.7 EN 1601
Vapour pressure kPa 40.0 60.0 EN ISO (DVPE) Sulphur content2 mg/kg — 10 EN 15485 or EN 15486 Oxidation stability Minutes 360 EN ISO 7536 Existent gum content (solvent washed) mg/100ml — 5 EN-ISO 6246 Appearance This shall be determined at ambient temperature or 15°C whichever is higher Clear and bright, visibly free of suspended or precipitated contaminants Visual inspection Ethanol and higher alcohols3 per cent v/v 83 85 EN 1601 EN 13132 EN E DIN Higher alcohols (C3-C8) per cent v/v — 2.0 E DIN 51627-3 Methanol per cent v/v 1.00 E DIN 51627-3 Petrol4 per cent v/v Balance EN 228 Phosphous mg/l 0.205 EN 15487 Water content per cent v/v 0.300 EN 15489 or EN 15692 Inorganic chloride content mg/l 1 EN 15492 pHe 6.5 9.0 EN Copper strip corrosion (3h at 50°C) Rating Class 1 EN ISO 2160 Acidity, (as acetic acid CH3COOH) per cent m/m (mg/l) — 0.0050 (40) EN Electric Conductivity µS/cm 1.5 DIN 51627-4 or prEN 15938 Carbon/hydrogen ratio Report Carbon/oxygen ration Report
2 This method may not accurately determine the presence of corrosive materials if the sample contains corrosion inhibitors or other chemicals which diminish the corrosivity of the sample to the copper strip. Therefore, the addition of such compounds for the sole purpose of biasing the test method is prohibited. 3 At the request of the engine manufacturer, a higher MON be used to perform the type approval tests. 3.2. Type: Natural Gas/ Biomethane 3.2.1. Specification for reference fuels supplied with fixed properties (eg from a sealed container) As an alternative to the reference fuels set out in this paragraph, the equivalent fuels in paragraph 3.2.2. of this Annex may be used Units Basis Limits Test method minimum maximum Reference fuel GR Composition: Methane 87 84 89 Ethane 13 11 15 Balance1 per cent mole — — 1 ISO 6974 Sulphur content mg/m3 2 — 10 ISO 6326-5 Notes: 1 Inerts + C2+ 2 Value to be determined at standard conditions 293.2 K (20 °C) and 101.3 kPa. Reference fuel G23 Composition: Methane 92.5 91.5 93.5 Balance1 per cent mole — — 1 ISO 6974 N2 per cent mole 7.5 6.5 8.5 Sulphur content mg/m3 2 — — 10 ISO 6326-5 Notes: 1 Inerts (different from N2) + C2+ C2+ 2 Value to be determined at 293.2 K (20 °C) and 101.3 kPa. Reference fuel G25 Composition: Methane per cent mole 86 84 88 Balance1 per cent mole — — 1 ISO 6974