1. Basis weight
Definition: The weight of a unit area of paper and cardboard determined by standard methods.
Unit: g/m² or gsm (Grams per Square Meter)
Example: in the technical specification table
Basis weight 165 ± 4%
2. Thickness (thickness/caliper)
Definition: the distance between two sides of the paper measured by standard methods.
Unit: mm
Example: in the technical specification table
Thickness 218 ± 6
3. Moisture Content
Definition: the amount of water in the material.
Unit: %
Example: in the technical specification table
Moisture Content 5.0 – 6.0
4. Opacity
Definition: the ratio expressed as a percentage of the amount of light reflected from a sheet of paper placed on a black standard object and the amount of light reflected from the same sheet of paper placed on a white standard object under the conditions of the standard test method.
Unit: %
Example: in the technical specification table
Opacity >=96.0
5. Smoothness
Definition: a characteristic property to evaluate the flatness of the paper surface.
Unit: sec/10ml
Example: in the technical specification table
Art paper Enova 100gsm
Smoothness >=900
6. ISO brightness (ISO brightness)
Definition: The light reflectance coefficient of white or nearly white pulp sheets, paper and cardboard according to the reflection of an ideal diffuser at a wavelength of 457nm determined on a standard measuring device specified in the test method
Unit: %
Example: Fo IK paper has a whiteness of 92%-96%