Some materials never trend — they simply persist. Wood wool cement board, invented in the 1920s and refined ever since, belongs to that category. Strands of natural wood, bonded with Portland cement into rigid gray-green panels, it remains in production across Europe and Asia and keeps finding its way into projects where modern alternatives struggle. Understanding where it wins — and where it does not — rounds out any buyer’s material knowledge.
How it works acoustically
Wood wool board is not a dense absorber like PET felt; it is an open-textured, porous panel whose rough fibrous surface and interconnected pores dissipate mid-to-high frequency sound. Its raw absorption is moderate — typically equivalent to Class C–D — which is why it is frequently finished with a sprayed acoustic coating or used in thick formats to reach higher performance. In practice it is often paired with cavity mounting, which lifts its low-frequency contribution substantially.
Where it genuinely outperforms
- Fire. The cement matrix makes panels non-combustible in the A2 class territory — a rating PET products approach but never reach. Plants, tunnels, parking structures and escape routes specify wood wool for this reason.
- Moisture and decay. Cement-bound wood does not rot, swell like MDF or feed mold; pool halls, spas and semi-exterior canopies are classic applications.
- Impact and abuse. Gymnasiums, sports halls, school corridors and industrial spaces — panels survive balls, trolleys and decades of rough service.
- Thermal mass and stiffness. Boards span roof structures and add thermal capacity, doing two jobs in one product.
The honest limitations
Wood wool is heavy, its raw look is industrial rather than refined, and cutting it on site is dusty work. Aesthetically it depends on paint or sprayed finishes to enter design-driven interiors, and its absorption per millimeter of thickness is lower than PET felt’s. In office and hospitality fit-outs, wood slat panels on PET backing deliver more performance per kilogram — at the cost of wood wool’s ruggedness.
A portfolio view for buyers
No single acoustic material serves every room. A professional assortment covers the spectrum: PET panels for offices and schools, wood slat systems for design-led commercial interiors, and rugged products like wood wool for the hard-use, fire-critical and humid spaces between. MST Acoustics focuses on the PET and wood-slat families — and specifies openly when a project’s demands belong to another material. Knowing the whole toolbox is part of the specification service your projects expect.
