3.Machining and processing HPL
If two HPL-Compact sheets are connected with tongue and groove, groove width (a) and groove side thickness (b) have to be at least 3 mm. Where the design allows, the groove side thickness (b) should be larger than the groove width (a). The groove depth should be kept as low as possible (max. 10 mm). As for the rest, the following guide values apply:
a Tongue width | b Tongue side width | c Groove width | d Sheet thickness
| Tongue width a | 3 mm |
| Tongue side width b | ≥ 3 mm |
| Groove width c | < 10 mm |
| Sheet thickness d | ≥ 10 mm |
Due to the possible dimensional changes, the HPL-Compact sheets have to be mounted with sufficient play between tongue and groove. HPL-Compact sheets with less than 10 mm thickness should not be connected with tongue and groove. A connection with a “false tongue” is also beneficial because it allows the full plate format to be used and simplifies processing. Adhesive bonding has to be carried out in such a way that the dimensional changes of the HPL-Compact are not impeded. It also has to be ensured that the sheets are only bonded in the same running direction because the dimensional changes differ in length and width, which may cause tensions.
Corner joints should only be executed with squares or angle rails depending on the expected load.
