MASTERBOARD® is a calcium silicate board reinforced with selected fibres and fillers. It is formulated without inorganic fibres and does not contain formaldehyde.

MASTERBOARD® is off-white in colour and has a smooth finish on one face with a sanded reverse face. It can be left undecorated or can be easily decorated with paints, wallpapers or tiles.

MASTERBOARD® is resistant to the effects of moisture, will not physically deteriorate when used in damp or humid conditions and can withstand temperatures up to 80°C and frequent temperature changes

Further Information


  • Partitions.
  • Wall and roof linings.
  • Soffit, porch or canopy linings.
  • Integral garage ceilings.
  • Swimming pool ceilings.
  • BBA Agrément Certificate No. 18/5593.


  • Up to 30 minutes fire resistance.
  • Suitable for areas of high humidity
  • Multi-purpose internal and semi-exposed applications
  • Fire Reaction Class: A1 Non Combustible EN13501-1
  • BBA Certified
Approx. Dry Density (kg/m³): 975 kg/m³
Moisture Content Min (%): 6 %
Approx. Thermal Conductivity @ 20 °C (W/m°K): 0.22 W/m K
Bending Strength Longitudinal (N/mm²): 4.5 N/mm²
Tensile Strength Longitudinal (N/mm²): 0.99 N/mm²
Compressive Strength (N/mm² perpendicularly to the board surface): 9.3 N/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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