International standards are used in lubricant documentation to define viscosity classifications, test frameworks, and terminology. This page explains common ISO and DIN references and how they are used in technical literature.
Standards describe measured properties and classification structures rather than application suitability.
ISO viscosity grades
ISO viscosity grades classify industrial lubricants by kinematic viscosity at 40°C. Each ISO VG number represents a nominal viscosity range with defined tolerances.
ISO VG references commonly appear in hydraulic oil, circulating oil, and industrial lubricant documentation.
DIN classifications
DIN standards define lubricant terminology, performance categories, and associated test references used in European documentation.
DIN classifications often appear alongside ISO viscosity grades and ASTM test method references.
How standards references are used
- To define viscosity classification
- To reference test procedures
- To provide consistent terminology across documents