ISO 2813

Measurement Geometry

Three specific angles of incidence allow for the characterisation of various sheen levels. Equipment settings at 20 degrees target high-sheen surfaces, while the 60 degree setting handles the majority of standard packaging boards. For very dull or matte materials, the 85 degree angle provides the resolution needed to detect subtle differences in surface texture.

Calibration Procedure

Routine checks against a certified black glass reference tile maintain the accuracy of the instrument over time. Operators must verify that the light source and the detector remain aligned to the precise physical tolerances described in the document. Dust or scratches on the internal optics will cause the readings to drift and lead to false pass or fail results on the production line.

Regular cleaning of the reference standards ensures that the baseline for every test remains stable across different shifts and operators. Consistent maintenance is required to keep the testing environment within the allowed limits.