1. EN ISO 6619, 1988. Petroleum products and lubricants–Neutralization number—Potentiometric titration method.
2. EN ISO 22719, 1993. Petroleum products and lubricants—Determination of flash point—Pensky-Martens closed cup method.
3. EN ISO 3104, 1996. Petroleum products—Transparent and opaque liquids—Determination of kinematic viscosity and calculation of dynamic viscosity.
4. EN ISO 3675, 1998. Crude petroleum and liquid petroleum products—Laboratory determination of density—Hydrometer method.
5. EN ISO 3733, 1999. Petroleum products and bituminous materials—Determination of water—Distillation method.