PROMATECT® 250 comprises autoclaved calcium silicate spheres (PROMAXON® is a synthetic hydrated calcium silicate in spherical form) bound in a mineral matrix. PromaX® technology provides excellent fire performance in most applications.

PROMATECT® 250 is off-white in colour. One face is smooth and ready to form a finished surface, able to receive almost any form of architectural/finish treatment. The reverse face is sanded.

PROMATECT® 250 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. However, PROMATECT® 250 is not designed for use in areas subject to continual damp or high temperatures. PROMATECT® 250 is for internal applications only.

Further Information


  • Structural Steel Protection


  • Steel Protection up to FRL 120/-/-
  • High level of finish
  • Most types of architectural finishes can be applied.
  • Non combustible to AS1530.1
Thickness (mm) Dimensions (mm) Boards Per Pallet Weight per board (kg)
15 2500x1200 48 34
20 2500x1200 35 45
25 2500x1200 28 56
30 2500x1200 24 68

Reaction to fire: A1, non-combustible
Use Category: z2
Approx. Alkalinity (pH): 9pH
Approx. Dry Density (kg/m³): 750kg/m³
Moisture Content Min (%): 2%
Approx. Thermal Conductivity @ 20 °C (W/m°K): 0.189W/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): 6.6N/mm²
Storage Conditions: Storage Temperature 2ºC : 45ºC. Must protect from freezing and excessive heat. Store in a dry environment.
Storage Temperature Min (°C): 0°C
Storage Temperature Max (°C): 45°C

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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