DEFENS MP Fire Protection Plaster
Fire protection material (plaster) for load-bearing steel structures “Defens MP” is designed to increase the fire resistance rating to R150.
Specifications
In its original form, the substance before application is a ready-to-use bulk mixture of gray plaster type based on expanded vermiculite, inorganic binder, fillers, and targeted additives.
Purpose and area of application
DEFENS MP is a dry mixture that transforms into a fire-resistant layer after application (wet shotcreting). It is used to protect steel structures, forming a fire-resistant coating thickness that meets the requirements of R-classes.
Advantages and features of the material
- The material is supplied as a dry mixture, ready for use.
- The fire-resistant layer is formed during application using the wet method (shotcreting).
- Manual application is not allowed — only mechanized methods.
- The coating is formed layer by layer to achieve the required thickness.
Application recommendations
Surfaces should be treated with Defens MP Primer before application to enhance adhesion.
The primer should evenly moisten the surface, applied at a consumption rate of ~0.2 kg/m².
The fire-resistant mixture is applied only by mechanized means (shotcrete, plastering units of the DUO MIX type) — manual application is prohibited.
The coating is applied in layers; each layer must correspond to the recommended thickness (horizontal / vertical surfaces).
Requirements for properties and substrate preparation
Metal structures must be primed, cleaned of rust, dust, and contaminants to ensure reliable adhesion.
The primed surface must be completely dry before applying the MP mixture (but no later than 24 hours after primer application).
For existing paint or primer coatings not on the recommended list, the application of the MP substance should be coordinated with the manufacturer.
Requirements for application conditions
Temperature and humidity must be within acceptable limits; application is not allowed under unfavorable conditions.
During application and layer formation, there should be no vibrations or movement of the structure.
Method of application
Mechanized method: shotcreting (wet spraying) — the mixture is applied through plastering units onto a moistened surface.
Application of the preliminary MP Primer, waiting for drying before the main application.
The coating is created layer by layer; the recommended thickness of one layer: horizontal surfaces — up to ~15 mm, vertical — up to ~20 mm.
The wet layer during application is formed with water in the appropriate ratio (for example, 1 kg of dry substance to ~1.0–1.2 l of water).
After application, the layer thickness is measured immediately, as it coincides with the thickness after drying (without significant changes).
Technical Specifications
| Parameter Name and Unit of Measurement | Parameter Value |
|---|---|
| Appearance | Homogeneous bulk mixture of a light color. The color and shade are not standardized. |
| Appearance of the coating | Solid, without cracks, foreign inclusions, swelling, and delaminations |
| Density, kg/m³ | 300-600 |
| Thermal conductivity coefficient no more than, W/m°C | 0.15 |
| Fire resistance limit | Up to R150 for load-bearing metal structures (according to the certificate) |
| Minimum "combined metal thickness" | 3.57 mm - as a condition for achieving R150 |
| Application conditions (temperature) | From +5 °C to +40 °C |
| Relative humidity during application | No more than 75% |
| Surface temperature before application | No more than +35 °C (when the surface is heated) |
PRODUCTS IN
CLIENT PROJECTS
DEFENS MP Fire Protection Plaster
Object – Shopping and Entertainment Center, Kharkiv
Object – Shopping Center, Kyiv
Object – sports complex, Chișinău, Moldova
Object – logistics center, Lviv
Object – warehouse and production premises, Kyiv region
Object – sports complex, Rivne
Object – ATB store, Kyiv
Object – Shopping Mall, Kyiv
Object – Warehouse Complex, Bucha
Object – hotel complex, Odesa
Object – tech station, Irpin
Object – restaurant complex, Kyiv
Object – museum estate, Kyiv
Restoration of old concrete floors, Dnipro
