HSD P7

HSD P7 is the answer for applications where load requirements exceed the capabilities of class P5. Bending strength is 22 N/mm² (12 and 15 mm) or 20 N/mm² (18 mm), the modulus of elasticity reaches 4150 N/mm², internal bond strength is 0,70–0,75 N/mm², and swelling after 24 hours is only 7 %.

Compared with an OSB/3 board of the same thickness class (13–20 mm), HSD P7 has more than twice the internal bond strength (0,70 versus 0,32 N/mm²), half the swelling (7 % versus 15 %) and a considerably higher modulus of elasticity (4000 versus 3500 N/mm² in the major axis, or 1400 N/mm² in the minor axis). With HSD P7 there is no distinction between a major and a minor axis, so there is no loss of material due to board orientation.

Accredited air permeability testing to EN 12114 (VVÚD Praha, report MVZ-A-2025-003748) measured a value of only 0,044 m³/(m²·h) at a pressure difference of 50 Pa, which makes HSD P7 an exceptionally airtight board for the building envelope. At the same time the board remains vapour-open: to EN ISO 12572 (ITC Praha, report 25/T053) the water vapour diffusion resistance factor is μ = 148,7, or an equivalent air layer thickness of sd = 2,27 m at a thickness of 15 mm.

Formaldehyde emission meets class E1 to EN 312, but also the stricter E1-LE requirements to ChemVerbotsV (≤ 0,05 ppm), EPA TSCA Title VI and IKEA IOS-MAT-0003, so the board is also suitable for interior applications and furniture manufacturing.