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A compressed, dense building board which is suitable for external use and can withstand impact and abrasion.

The product is manufactured from a homogeneous mixture of Portland cement, organic fibres and selected mineral fillers and autoclaved resulting in a product with high dimensional stability and high strength.

Features and benefits:

  • Cladding and infill panel.
  • Rainscreen cladding.
  • Sheathing.
  • Non-combustible external board.

General information
Uniclass 2015
Pr_25_71_52_23 Fibre-reinforced calcium silicate boardsPrimary

K11/60 Board

K11/795 Wall lining on metal framing

K11/885 Fire protection board

M40/27 Intermediate substrate

M40/470 Intermediate substrate

P12/310 Boards

Specification data - Fibre-reinforced calcium silicate boards
Product Reference



4.5 mm

Weight: 5.9 kg/m².

6 mm

Weight: 7.8 kg/m².

9 mm

Weight: 11.7 kg/m².

12 mm

Weight: 15.6 kg/m².

Standard product features

Surface finish:

Front and back faces: Smooth and sanded.

Technical characteristics:

  • Size (l x w): 2440 x 1220 mm.
  • Material: Calcium silicate.
  • Combustibility: Non-combustible.
  • Surface spread of flame: Class 1. (Class 0 Building Regulations).
  • Nominal dry density: 1300 kg/m (average).
  • Alkalinity: pH 11 (approximately).
  • Thermal conductivity at 20°C: 0.35 W/m·K (approximately).
  • Coefficient of expansion (20-100°C): 6 x 10^6 m/m·K.
  • Nominal moisture content: 6% ambient.
  • Moisture movement (ambient to saturated): 0.06%.
  • Flexural strength (F rupture): 10.5 N/mm².
  • Nominal weight: 8500 N/mm².
  • Allowable radius of curvature: Varies depending on thickness, consult literature.
  • Fixing: Mechanically, screws or nails.

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