ISO 3104 describes two test methods for the determination of the kinematic viscosity of both transparent and opaque petroleum products. Procedure A (manual) and Procedure B (automated). Procedure A is the referee test method (or reference test method) to resolve doubts or disputes.
Many petroleum products and some non-petroleum materials are used as lubricants. The correct operation of equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate measurement of viscosity is essential to many product specifications.
The text of ISO 3104:2023 has been approved in Europe as EN ISO 3104:2023 without any changes.