PROMATECT®-L is a lightweight mineral matrix engineered board which is white in colour and has a smooth sanded surface on one face with a lightly honeycombed texture on the reverse face.

PROMATECT®-L is resistant to the effects of moisture and will not physically deteriorate when used in damp or humid conditions. Performance characteristics are not degraded by age or moisture. Untreated surfaces will absorb water which can cause some loss of strength but strength is regained after drying. PROMATECT®-L does not encourage mould growth and is resistant to attack by vermin.

PROMATECT®-L is chemically inert and is resistant to diluted acids and alkalis. Boards should be protected where high chemical concentrations are likely to occur.

Further Information


  • Structural Steel Protection
  • Cable Ducts


  • Lightweight
  • Steel Protection up to 240/-/-
  • Circuit Integrity for Cables up to 120/120/120
Thickness (mm) Dimensions (mm) Boards Per Pallet Weight per board (kg)
25 2500x1200 35 34
30 2500x1200 30 40
  • Other thicknesses and sizes available as special order

Reaction to fire: A1, non-combustible
Use Category: z1, z2
Approx. Alkalinity (pH): 9pH
Approx. Dry Density (kg/m³): 450kg/m³
Approx. Moisture Diffusion Resistance (μ): 3.2
Approx. Thermal Conductivity @ 20 °C (W/m°K): 0.083W/m K
Bending Strength Longitudinal (N/mm²): 3.1N/mm²
Tensile Strength Longitudinal (N/mm²): 1.3N/mm²
Compressive Strength (N/mm² perpendicularly to the board surface): 2.4N/mm²

Please note
All physical and mechanical values are averages based on standard production and tested according to internal procedures. The typical values are given for guidance. The figures can change dependent on the test methods used. If a particular value is of prime importance for a specification, please consult Promat Technical Department.


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