PROMATECT®-L500 is a lightweight mineral matrix engineered board which is off-white/beige in colour and has a smooth sanded surface on one face with a lightly honeycombed texture on the reverse face.

PROMATECT®-L500 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®-L500 does not encourage mould growth and is resistant to attack by vermin.

PROMATECT®-L500 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


  • Ductwork.
  • Cable protection.
  • Service enclosures.
  • Penetration Seals


  • Single layer systems for E&M and Air Duct Protection Systems up to 120/120/120
  • Horizontal and Vertical Penetration barriers up to -/120/120
  • Resistant to the effects of moisture
  • Circuit Integrity Duct Systems available
  • E&M Protection Systems for up to 240/240/240
  • Non-Combustible to AS1530.1
Thickness (mm) Dimensions (mm) Boards Per Pallet Weight per board (kg)
52 2500 x 1200 16 78
  • 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): 480kg/m³
Approx. Moisture Diffusion Resistance (μ): 3.2
Approx. Thermal Conductivity @ 20 °C (W/m°K): 0.09W/m K
Bending Strength Longitudinal (N/mm²): 3N/mm²
Tensile Strength Longitudinal (N/mm²): 1.2N/mm²
Compressive Strength (N/mm² perpendicularly to the board surface): 5.5N/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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