Physical properties of materials
Tensile strength
Roughness (surface)
Performance
Stationery
Paper
Reflectance factor
Dimensional tolerances
Test specimens
Temperature
Marking
Water content determination
Opacity
Packaging
Joints
Stiffness
Dimensions
Rigidity
Humidity
Optical properties of materials
Linear density
Commercial
Density
Continuous stationery
Moisture
Printing paper
Link: PD CEN/TS 17217:2018 Postal services. Reverse envelope. Design and printing requirements
Source: BSI Standards
