The
density of rigid polyurethane foam used for thermal insulation
in buildings ranges between 30 kg/m³ and 100 kg/m³ depending
on the application.
For special applications
that are subject to extreme mechanical loads, the density
of the PUR/PIR rigid foam can be increased to 700 kg/m³.
Even at low densities,
polyurethane keeps excellent mechanical properties such
as compressive stress, compressive strength and
creep. These properties are essential in load
bearing applications, such as floorings. |
Long-term pressure curves
of rigid polyurethane foam (PUR/PIR rigid foam insulation
board, 33 kg/m³ with aluminium foil facing, long-term
load 40 kPa, measured values after 2 and 5-year load
period and extrapolation to 20 and 50 years) |
