3.Machining and processing HPL
Postforming HPL generally have a thickness of 0.5 – 1.2 mm and allow a bending radius of at least 10 times of the sheet thickness. These values apply to convex and concave curves parallel to the HPL sanding direction. These radii have to be at least 20 times of the sheet thickness, at 90 ° to the sanding direction.
It is especially important to store postforming HPL under normal climate conditions (18 – 25 °C and 50 – 65 % relative humidity), as incorrect storage has a negative influence on the bending properties. Excessive drying results in a marked deterioration of the bending properties. In addition, the bending properties of the HPL can deteriorate through material ageing over time.
