Spray systems

Mcr Tecwool 825

Application in industry and specialized buildings
The mcr Isoverm 825 system, based on mcr Tecwool 825, is ideally suited for industrial and specialized buildings where there is a risk of hydrocarbon fires.
General construction applications
The mcr Isoverm 825 system is also suitable for general construction applications exposed to standard fires in structures subject to weather conditions.

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The mcr Isoverm 825 system consists of:

mcr Tecwool 825 mortar designed for the main fireproofing insulation layer, hexagonal mesh steel reinforcement
optional steel pins with locking caps for fixing the mesh(opcjonalnie)
If the protected structure is exposed to direct weather conditions, an additional protective topcoat may be applied

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Characteristics

The fire resistance of the system is ensured by the appropriate thickness of the spray-applied material, depending on the section factor (U/A), required fire resistance class, and critical steel temperature.

The mcr Isoverm 825 set is intended for protecting steel elements with open profiles as well as circular and rectangular hollow sections.

Fireproofing insulation in the mcr Isoverm 825 system, where steel elements are protected with an anti-corrosion coating or zinc layer, can be used in environments corresponding to category X according to ETAG 018-3, i.e., indoor and outdoor conditions.

Thanks to its optimized density, the mcr Isoverm 825 system is perfectly suited for industrial and specialized facilities such as power plants, refineries, chemical plants, offshore platforms – wherever there is a risk of hydrocarbon fires – as well as for general construction uses exposed to standard fires.

For general construction applications at risk of standard fires indoors, we recommend the lightweight mcr Tecwool F spray-applied system. mcr Isoverm 825 provides steel structures with a section factor U/A = 453 m⁻¹ with fire resistance ratings from R15 to R360.

Technical specification

DRY MIX
Appearance	Dry light-grey mix, free from lumps and impurities
Bulk density	385 ± 10% kg/m³
FRESH MORTAR
Appearance	Homogeneous grey mass with beige inclusions, free from lumps and impurities
Dry density	402 ± 10% kg/m³
Flexural strength	≥ 1.0 MPa
Compressive strength	≥ 1.5 MPa
Adhesion to steel substrate coated with two-component epoxy anti-corrosion paint	≥ 0.1 MPa or fracture within the coating
Adhesion to steel substrate coated with polyurethane anti-corrosion paint	≥ 0.1 MPa or fracture within the coating
Adhesion to galvanized steel substrate	≥ 0.1 MPa or fracture within the coating
Linear shrinkage	0.03 %