4.Versatility of HPL
Equipping HPL with magnetic properties has no impact on the HPL surface. This means that it can be combined with write-on or projection surfaces without any problems.
The combination of marking and projection on the same surface is more difficult, since the two requirements conflict with each other, depending on the writing material used. To this end it is useful if, prior to using a multi- functional surface, it is known what kind of writing material will be used. When using blackboard chalk, a slightly rough, i. e. matt, surface is required in order to achieve good contrast. These conditions are ideal since matt surfaces with gloss levels of less than 10 (60° measurement) are the most appropriate for projection screens, too.
Most other pens – such as whiteboard markers, liquid chalks, wax and oil crayons, felt markers, fluorescent markers, etc. – can also be used on matt (rough) surfaces. But cleaning the surface properly can be extremely laborious. To simplify the cleaning process, smooth or glossy surfaces are more suitable for these pens. These surfaces feature gloss levels of approx. 80 (60° measurement) and more. For projection screens, however, such surfaces have too much reflection.
A good compromise would be surfaces with a gloss level of approx. 10 – 20. These surfaces exhibit minor reflection during projections and can be cleaned with relatively little effort. Since various textures are feasible at these gloss levels, we recommend opting for a certain type of pen, testing the effort that it takes to clean the available surfaces (gloss level < 20) and selecting the combination that involves the least effort
