PROMATECT®-L500 is a non combustible low density calcium silicate board, used for the construction of fire resistant ducts, and to provide fire rated cable and service enclosures.

PROMATECT®-L500 is off white 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, and while untreated surfaces will absorb water which can cause some loss of strength full strength is regained after drying. It will not encourage mould growth and is resistant to attack by insect or vermin.

PROMATECT®-L500 is chemically inert and is resistant to dilute acids and alkalis.

Further Information


  • Ductwork
  • Cable protection
  • Service enclosures


  • 30-240 minutes fire resistance
  • Fire Reaction Class: A1 Non Combustible EN13501-1
  • Large spans tested for self supporting ducts
  • Used in damp or humid conditions
  • Excellent fire insulation properties
Reaction to fire: A1, non-combustible
Use Category: Z1, Z2
Approx. Alkalinity (pH): 9 pH
Approx. Dry Density (kg/m³): 480 kg/m³
Approx. Moisture Diffusion Resistance (μ): 3.2
Approx. Thermal Conductivity @ 20 °C (W/m°K): 0.09 W/m K
Bending Strength Longitudinal (N/mm²): 3 N/mm²
Tensile Strength Longitudinal (N/mm²): 1.2 N/mm²
Compressive Strength (N/mm² perpendicularly to the board surface): 5.5 N/mm²
Storage Conditions: Store in a dry and well-ventilated space, under cover, on a flat surface.

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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