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MATERIALS 43
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overall durability performance of wood based panels. In this context, this study investigates the dimensional
Natural weathering provides the most realistic assessment stability and mechanical performance of three industrial panels
of durability by exposing panels to environmental stresses, designed for outdoor use by measuring changes in MOR,
including precipitation, temperature changes, ultraviolet radiation, MOE, and IB strength under accelerated aging conditions.
freeze thaw cycles, and biological attack. This work makes a novel contribution by comparing
Outdoor tests provide valuable data on real world commercially available exterior grade particleboard and MDF

performance, forming the basis for service life estimates and products under standardised aging conditions. Additionally, it
lab correlations. However, natural weathering has limitations: it examines how specimen orientation (parallel vs. perpendicular
takes at least five years to obtain reliable data, regional climate to mat formation) affects both dimensional stability and
variability complicates standardisation, weather conditions are mechanical performance.
unpredictable, and outdoor testing is resource intensive.
These issues have led to the development of accelerated Materials
aging methods that apply intensified stresses, reducing In this study, three industrial panels manufactured by an
degradation from years to days or weeks while replicating industrial partner were evaluated. The panels included two
natural damage mechanisms. Laboratory methods enable quick types of particleboard, each measuring 1210 mm × 1210 mm

comparisons of designs under controlled moisture, temperature, (length × width), and one MDF measuring 1210 mm × 2420
and drying cycles. mm (length × width).
Typical aging conditions include water immersion (20°C The length corresponds to the mat formation direction,
to boiling), exposure to steam at 93 deg C, vacuum soaking, while the width corresponds to the direction perpendicular
freezing at –12 deg C, and oven drying at 60–107 deg C, to the mat formation. All samples were unfinished products,
with varying sequences and cycles to maximise degradation. without any surface coatings.
The ASTM D1037 12 (2020) six cycle method is one of the The first particleboard (PB1) had a nominal thickness of

harshest; others, such as European V313, APA D 1, and 9.7 mm (3/8″) and consisted of a three layer structure, with
Japanese standards, differ in severity and duration, and are fine particles on the surface layers and coarse particles in
used in industrial quality assurance and research for MDF the core layer.
and particleboard. The second particleboard (PB2) had a nominal thickness
Despite extensive research on the durability of wood based
panels, significant gaps remain in understanding the long term
Dirk Stoop
performance of particleboard and MDF panels specifically
manufactured for exterior applications under accelerated aging
conditions.

While individual studies have examined specific panel types,
comprehensive comparative assessments evaluating multiple
products simultaneously remain limited.
Furthermore, the influence of potential particle/fibre orientation
on thickness swelling and bending properties across different
panel types has not been systematically investigated under
identical aging conditions.