Heat-insulating productsRemovable heat-insulationFireproof systemsEquipment
Fireproof System FIX
Description of the system

Fireproof system FIX consists of insulating material - heat-insulating cardboard ( -1) or heat-insulating hard boards ()based on glass fiber made of rock and glue with liquid glass. Cardboards and hardboards are made according to Technical Specifications 2.7-23.9-00292818-001 2012 (with changes 1 and 2) and can be done: 

  • Without covering (-1, );
  • With covering of aluminum foil (-1-F, -F).

Glue is supplied as homogeneous pliant mass of yellow-grey color, without big lumps and mechanical impurities (there can be solid matters in the mass with diameter not more than 1 mm) in closed tight capacities which exclude ingress of moisture and solid matters.
It is strictly forbidden to apply as glue for the fireproof system FIX substances, which include other components with other physicochemical and operational characteristics or with irrelevant consistence.

Operating conditions of fireproof system:

Fireproof system can be operated in heated and non-heated premises or under shed, avoiding  direct hit of atmospheric precipitation.

Serviceability of the fireproof system FIX, if follow operating technology, is not less than 10 years.

Pic.1. Fire protection of the air duct with rectangularcross-section

   1 suspension mount of the air duct; 2 glue; 3 cardboard -1 (hardboard ); 4 - flanged joint isolation.


1. Surface preparation

Installation of the fireproof system FIX on the steel air ducts and chimney holes involves thorough pasting of the whole area with cardboards -1 or hardboards and joining of the cardboard or hardboard with glue.


Making of fireproof coverings starts with preparation of protected surface. Steel elements, on which fireproof system FIX is installed, must be:

  • Dry;
  • Clean from inorganic impurity (cement, lime, clay etc.);
  • Clean from oil and other impurities (including paint), if needed elements can be cleaned (degreased) with alcohol or another dissolving agent. Liquid alkaline detergent also can be used.

Pic.2. Scheme of flanged joint isolation

1-Air duct; 2-glue; 3 cardboard -1 (hardboard ).


2. Gluing

Glue is applied with palette knife on the prepared elements, evenly on the whole surface which is to be protected (the thickness of glue application according to the appendix to the certificate), then, insulating material is stick with its fibrous surface to this surface.

Example of fire-proof protection of air-duct with rectangular cross-section provided on the pic.1.

Flange joints of air-duct are isolated with the help of U-type flaps (see pic.2.) of 2 layers of insulating material with width not less than 100 mm for cardboard and hardboard.


There are angular and axial ways of cardboard joining (see pic.3 and 4).


Pic.3. Angular joining



Pic.4. Axialjoining

Pic.4. Axialjoining

Cutting of the insulation is performed with the help of ruler and a box cutter. High adhesion of the glue to the metal surface and its alkaline structure provide good chemical protection of the steel surface from the rust and do not require any additional rust-resistant coverings.

4. Sizing of the junctions with aluminum tape if needed

During the gripping period, parts which are under risk of unsticking of protective covering from the construction can be additionally reinforced with the band with polymeric sealing tape which is set with minimal pitch 450mm. After the gripping of the glue, the band can be removed.

Quality control of fireproof coverings is carried out visually. The surface must be smooth, fully covered with fireproof system, without gars, mechanical failures, splits and scorings of the edges. Junctions of the fireproof material must be entirely filled with glue. Exfoliation of the cardboard at the junctions is inadmissible.