Processing and working instructions HPL and HPL elements PR ...

PRODUCT INFORMATION
• DUROPAL HPL which is intended for a DUROPAL HPL element should be stacked for at least three days
with the reverse sides facing each other. Joint conditioning together with the core material can then be
dispensed with, provided that this has been stored properly. If the DUROPAL HPL will later be exposed
to consistently low relative air humidity, the conditioning should be carried out accordingly, e.g.
20 hours at 40 °C or 10 hours at 50 °C. The adhesives should be stored at room temperature. Bonding
must be carried out immediately after conditioning.
Please note: This information applies only for processing in normal climatic conditions. For extreme
conditions, please consult us.
7.4 Stress equalisation
When two different materials are bonded together, tension always occurs. Core materials must therefore
be laminated on both sides with materials which are subject to the same dimensional changes under the
effects of heat and moisture. This applies particularly if the finished composite panel is to be self-supporting,
and will not be held by any rigid construction. As the size of the surface increases, more care needs
to be taken in selecting a surface to balance it, as well as the density, symmetry of structure and rigidity of
the core.
The best results will be achieved by selecting the same DUROPAL HPL type in identical thickness for the lamination
on both sides. When using HPL with film (for protection of the surface), care must again be taken
to ensure a symmetrical arrangement. The DUROPAL HPL cut-outs must always have the same direction of
grain. DUROPAL HPL must be bonded to the core material using the same sanding direction on both sides.
It is best to use our HPL balancing material of equal thickness or also best suited for this purpose.
7.5 Working with DUrOPAL real metal laminates
The working of different types of materials into composite elements always leads to stresses between the
different materials. Core materials must therefore be laminated on both sides with materials which are subject
to the same dimensional changes under the effects of heat and moisture. Particular care must be taken
to maintain symmetry of structure if the composite element is to be self-supporting. When working with
DUROPAL real metal laminates, the correct direction of the décor pattern must also be followed. To make
this easier, the protective film is marked with direction arrows to show the direction of the décor.
099 PI Processing and working instructions Page 16 of 34