Kemwell Silboard
Structural Steel Fire Protection Systems


Kemwell Silboard® Structural Steel Protection

Fire protection board systems designed to meet the stringent requirements of the multi-storey commercial and industrial steel framed market

Steel structures are used for building purposes worldwide. One of the main advantages is that they have great resistance per weight unit, which provides them with huge versatility and the possibility of creating complex, yet light structures.

However, the thermal conductivity of steel represents a disadvantage. Therefore, in the event of a fire, the gradual increases in temperature plus steel high heat transmission result in a substantial reduction of the structure’s bearing capacity and mechanical resistance. The resistance and elastic limit are modified above 250°C, and above roughly 500°C the drop in resistance is significant enough not to support its design capacity.

Tests with Kemwell Silboard® have been performed pursuant to standard EN 13381-4 to determine the boards’ fire protection properties when applied to steel structural elements such as beams, columns or tension elements. Kemwell Silboard® has been tested to cover a great variety of steel profiles characterised by their section factors. Likewise, they have been tested for several standard specified design temperatures.

Kemwell Silboard® is a calcium silicate board with a clean white appearance and a density of approx. 550 kg/m3. It is supplied in a convenient size of 1250 x 800mm for ease of handling and is very easy to work, cut and fix. Kemwell Silboard® is suitable for internal and semi-exposed applications.

The thickness of board required to provide the desired level of fire protection is determined by reference to the steel section factor and the limiting steel temperature. 

You can specify Kemwell Silboard with confidence.


  • Commercial offices
  • Warehouses
  • Factories
  • Multi-storey car parks
  • Retail and leisure
  • Petrochem and Powergen


  • Column encasement
  • Beam encasement
  • Self-supporting ductwork
  • Semi-exposed and humid applications
  • Castellated sections
What sizes are available?

Kemwell Silboard® boards are tested in official laboratories certified by ENAC or other similar international entities and in accordance to EN and ASTM standards, among others.

Boards manufactured in accordance with:

  • ISO 9001:2008 Standard Quality Management Systems
  • ISO 14001:2004 Environmental Management Systems


Kemwell Silboard: 20, 30, 40 and 50 mm


Kemwell Silboard: 800mm


Kemwell Silboard: 1250 mm

Manufacturing Tolerances

Kemwell Silboard

Length Tolerance +/- 5 mm
Width Tolerance +/- 3 mm
Thickness Tolerance +/- 2 mmmm
Diagonal Tolerance +/- 5 mm



Fire Resistance

A1 classified as per EN 13501-1, designed to achieve fire protection up to R 360.

Insulation Performance

Kemwell Silboard® boards have high thermal insulation.

Moisture Resistance

Kemwell Silboard® boards are classified as Type Y according to EAD 350142-00-1106 for use in internal applications in both normal and high humidity environments, and semi-exposed applications

Smooth Surface

Kemwell Silboard® boards can be left as a standalone finish or can be painted if required.

Easy Workability

Edges of boards are square and the boards are quick and easy to assemble.


Kemwell Silboard® boards are strong and robust. System performance is unaffected by the hazards and conditions of the working environment.

Vermin Resistant

Kemwell Silboard® boards remain unaffected by rodent, termite and insect attack.


Call Us

UK: +44 (0)121 285 3156 Ireland: +353 (0)1 565 3756