Cement-bonded Particleboards

CETRIS^® cement-bonded particleboard is classified, as per its response to fire, as class A2, with additional classification s1 (production of smoke) and d0 (particles burning with flame), with an overall classification A2-s1,d0, i.e. non-flammable material. Thanks to this property the CETRIS^® board is an excellent material to be used in protecting the building structures against fire and in construction of structures with specified fire resistance. Fire resistance concerns a specific and decisive property of building structures. It is expressed in time (in minutes) and it is the time for which the assessed structures are able to resist the effects of "standard fire", i.e. fire occurring under precisely defined conditions. The fire resistance classification is carried out either based on a test, including conditions of direct application, or based on extended application (calculations, extrapolation, etc.) by an authorized person who issues a fire classification certificate. Fire resistance is stated in minutes in the basic scale: 15, 30, 45, 60, 90, 120 and 180 minutes. The values of fire resistance of the individual marginal conditions are identified as follows:

• R load capacity and stability
• E entirety
• I insulating ability - threshold temperature
• on non-warmed surface
• W marginal density of heat flow from non-warmed side
• S passage of combustion products

For every structure and pursuant to the respective project standard the determining marginal conditions are defined; then suitable structures are selected, such as:

• Structure complying with requirements of three basic marginal conditions, i.e. stability (R), entirety (E) and insulating ability (I) - the fire resistance of such structure is REI. These are primarily the requirements imposed on bearing fire separating structures, i.e. walls and ceilings.
• For non-bearing fire separating structures (interior partitions, soffits) fire resistance requirements need to meet only 2 marginal conditions, i.e. entirety (E) and insulating ability (I), thus EI.
• For bearing bar elements (beams and columns) only load capacity and stability are required - R.
• Fire closures requiring entirety (E) and insulating ability (I), formerly identified as PB closures, are pursuant to CSN 730810 identified as EI closures; closures, formerly identified as PO, i.e. where entirety (E) and threshold density of heat flow (heat emission -W) are required, are identified as closures of EW type.

Detailed information about this system may be downloaded in PDF format.