Fire rated calcium silicate board

RCM Siltech is a non-combustible flexible calcium silicate building board which provides superior workability due to a unique fibre reinforced formulation.

Siltech can be used in an extensive range of applications from fire rated partitions, non-combustible ceiling tiles, boiler encasing, door lining, timber frame fire rated floors/ceilings as well as an extensive range of OEM applications.

Siltech has been tested for 60 and 120-minute fire rated partitions.

  • BS 476: part 4 non-combustible

  • 1200mm x 2400mm (6mm, 9mm, 12mm and 15mm)
    1220mm x 2440mm (6mm, 9mm, 12mm and 15mm)

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  • Fire rated to BS 476: part 4 non-combustible
  • Highly flexible
  • Dimensionally stable
  • Extensive range of applications
  • High levels of workability
  • Ceiling tiles available
  • Integrates with other RCM products

Key applications

  • Partition walling
  • Flooring and ceilings
  • Ceiling tiles
  • Door panels
  • OEM applications for improved strength and density


RCM Siltech can be drilled, screwed and nailed with conventional hand tools.

For cutting the product in any volume, we recommend the use of an RCM poly crystalline diamond Dart Blade to avoid excessive wear on other blades. Alternatively, RCM offer a complete fabrication service, please contact our technical department for details or visit our fabrication and design page here.

Suitable for the Following Construction Types

  • Lightweight Steel Frame

  • Timber Frame

  • Modular / Offsite

  • Masonry

Technical Data

  • Nominal Density

    1150 kg/m3

  • Bending Strength

    ((Modulus of Rupture))

    ≥8 N/mm2

  • Modulus of Elasticity

    ( (MoE))

    4000 N/mm2

  • Thermal Conductivity

    ≤0.25 W/mk

  • Moisture Content


  • Reaction to Fire

    BS 476 Part 4 Non-Combustible & BS 476 Part 22

  • Biological Resistance

    Highly Resistant

  • Surface Condition

    • Front Face


    • Back Face


  • Durability

    ((Life Expectancy - Minimum) )

    30 years

  • Standard Board Sizes

    2440 x 1220mm

  • Thickness


    6 9 12 15

  • Nominal Mass of Product


    6.9 10.3 13.8 17.3

  • Dimensional Tolerance

    • Length


    • Width


    • Thickness


  • Product Testing and Certification

    • Fire Reaction Tests

      Siltech has been tested by Exova for 60 and 120 minute partitions

      BS 476 Part 4 Non-Combustible

      BS 476 part 21 and BS 476 part 22 fire rated through wall solutions

  • Recommended Fixings

    • Steel Frame

      4.8mm x 38mm Wing tip self drilling fixing

    • Timber Frame

      4.2mm x 42mm Climaseal self drilling fixing

  • Ceiling Tiles

    Siltech non-combustible ceiling tiles can be supplied in 600 x 600mm.

  • Additional Services

    Bespoke cutting service available for all thicknesses.

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