Material or substance with certain properties that are sufficiently homogeneous and  well defined to allow them to be used for calibration of a device, evaluation of a
measurement method or attribution of values to materials

Material accompanied by a certificate whose properties are certified by a procedure validated with uncertainty at a known level of confidence

Density, Distillation, Flash Point Pensky Martens, Trouble Point, Flow Point, Filter Limit Temperature, Freezing Point, Steam Tension, Viscosity, Benzene, Aromatic, Flash Point Abel, Flash Point TAG, Aniline, Smoke Point, Sulphur, Cetane Number, Octane Number, FAME content.

Certified Reference Materials (CRM) are essential to give analysts the assurance that their measurements are reliable: they form a reliable match with the international system, a recurring requirement in the world of measurement.

The use of the CRM and its certified values can validate or disprove the performance of a measurement system.

Certified Reference Materials (CRM) are used to calibrate the analysis devices used in test laboratories,  comparing the value displayed by the device with the reference value.
The analysis device may eventually be matched to reference values.

But CRM can be used simply to verify that a measuring device meets the specific requirements of the user.

By introducing the CRM into a batch of analysed products and for statistical mastery of the processes.

The CRM is used to verify the proper application and implementation of standard methods for the field of activity.

Comparison to reference values is essential for the validation of a new measurement or analysis process.