The thickness of the sheet is varied by the core. The standard thickness for coating substrates is 0.6 mm.
Sheets with thickness of up to several centimetres can be produced, also with decor on both sides
RESOPAL-HPL are sheets consisting of layers of cellulose fibrous material (normally paper) impregnated with thermosetting resins and bonded together in a high pressure process. The process, defined as a simultaneous application of heat (> 120 °C) and high specific pressure (> 5 Mpa), provides flowing and subsequent curing of the thermosetting resins to obtain a homogenous non-porous material (> 1,4 g/cm³) with the required surface finish.
Basically more than 60 % of the RESOPAL-HPL consist of paper and the remaining 30 to 40 % consist of cured phenol-formaldehyde resin for core layers and melamine-formaldehyde resin for the surface layer.
Both resins belonging to the group of thermosetting resins are irreversibly interreacted through cross linked chemical bonds formed during the curing process producing a non-reactive, stable material with characteristics which are totally different from those of its component parts.
RESOPAL-HPL are supplied in sheet form in a variety of sizes, thicknesses and surface finishes. Where improved fire retardance is required, the laminate core may be treated with an additive which does not contain halogens.
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