EXTHAMAT® fire-rated boards

EXTHAMAT: the reference fire-rated board

The EXTHAMAT board is the flagship product of the EXTHA range. Manufactured at our factory, this fibre-reinforced plaster fire-rated board constitutes the base material for constructing fire-rated staff ducts, structural enclosures, and ventilation and smoke extraction conduits.

Developed and refined over four decades of experience, the EXTHAMAT board offers an optimal balance of fire resistance, mechanical strength, ease of installation and durability. It is certified EI 120 and classified A1 (non-combustible) in accordance with applicable European standards.

EXTHAMAT P 35mm range

The main EXTHAMAT P range comes in boards of 35mm thickness, the standard used for the majority of fire-rated applications. This thickness achieves EI 120 classification with a single layer for staff ducts and enclosures.

Technical specifications

Characteristic	Value
Thickness	35 mm
Standard dimensions	3000 x 1200 mm
Surface density	approx. 30 kg/m²
Fire resistance	EI 120 (single layer)
Reaction to fire	A1 (non-combustible)
Thermal conductivity	0.30 W/m.K
Flexural strength	greater than 4 MPa
pH	neutral (non-corrosive)

Certifications and fire test certificates

EXTHAMAT boards are tested and certified to the following European standards:

• EN 1366-1: fire resistance of ventilation ducts — EI 120 classification
• EN 1366-8: fire resistance of smoke extraction ducts — EI 120 S classification
• EN 13501-1: reaction to fire — A1 classification (non-combustible)
• EN 13501-3: fire resistance classification of construction products and building elements

All fire test certificates and detailed technical datasheets are available in our downloads section.

Eco-responsible manufacturing

Unlike most manufacturers who dry their boards using gas, EXTHA air-dries its EXTHAMAT boards. This natural process, without fossil fuel consumption, considerably reduces the carbon footprint of our products. A unique ecological advantage in the passive fire protection market.

Applications of EXTHAMAT boards

The versatility of EXTHAMAT boards allows them to be used in a wide variety of fire-rated applications:

• Staff ducts: construction of fire-rated conduits for ventilation, smoke extraction and pipe runs
• Enclosures: protection of cable trays, pipework and technical shafts
• Fire-rated partitions: construction of fire-resistant walls for compartmentalisation
• Cladding: protection of steel or concrete structures by enclosure
• Plenums: construction of fire-rated suspended ceilings

Installation guide

Installation of EXTHAMAT boards requires adherence to precise rules to guarantee conformity of the installation with fire test certificates:

1. Cutting: boards are cut with a circular saw or jigsaw with a plaster-rated blade
2. Assembly: boards are assembled by bonding with EXTHAFIX adhesive and screwing onto a metal frame or stapling together
3. Jointing: joints between boards are treated with fire-rated compound to ensure continuity of protection
4. Fixings: mechanical fixings (screws, staples) must respect the spacing defined in fire test certificates
5. Access doors: integration of fire-rated access doors is carried out according to assembly drawings provided by EXTHA

Our technical teams are available to assist you with the specification and installation of EXTHAMAT boards. Do not hesitate to contact us for any technical question.