| Reference materials (RM) |
Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process |
| Certified reference materials (CRM) |
RM characterized by a metrologically valid procedure for one or more specified properties, accompanied by a certificate that states the value of the specified property, its associated uncertainty, and a statement of metrological traceability |
| Characterization of RM |
Determination of the property values or attributes of RM, as part of the production process |
| Value assignment |
Process by which RM property values or attributes obtained by characterization are combined and expressed in accompanying RM documentation |
| Property value of RM |
Value corresponding to a quantity representing a physical, chemical or biological property of [certified] RM |
| Nominal property value of RM |
Value corresponding to a qualitative attribute representing a physical, chemical or biological property of [certified] RM |
