Brief Description:Fire-resistant black rock wool board is A1 non-combustible insulation for smoke extract and ventilation duct fire cladding. It maintains stability under high temperatures and offers vibration resistance. Factory direct supply, custom sizes available for commercial and industrial HVAC fire safety projects.

Haochen Fire‑Resistant Black Rock‑wool Board (fire‑resistant black rock‑wool panel) is an A1 non‑combustible thermal‑insulation core material, upgraded and developed for fire‑cladding applications of smoke‑extraction ducts, positive‑pressure air‑supply ducts and HVAC ventilation ducts, conforming to international HVAC fire‑protection standards. It is widely used in ventilation and smoke‑control systems for commercial buildings, public facilities and industrial plants.

Unlike ordinary general‑purpose yellow rock‑wool on the market, this product is manufactured from high‑melting‑point ores including basalt and dolomite, with scientifically blended premium haematite. It has a natural dark‑brown raw texture without artificial dyeing. Its fine, dense fibres deliver considerably higher structural strength and stability than conventional insulation rock‑wool. Produced via high‑temperature melting, centrifugal fibre forming and high‑pressure curing processes, the board offers outstanding high‑temperature resistance, compression and vibration resistance, water repellency, moisture resistance and anti‑corrosion properties. It withstands long‑term harsh operating conditions such as high exhaust gas temperatures, continuous wind‑pressure vibration and extreme fire heat, and consistently meets requirements for fire‑resistant cladding, thermal‑acoustic insulation and fire stopping.

It is widely deployed in high‑spec ventilation fire‑protection projects for high‑rise buildings, underground car parks, commercial complexes, hospitals, rail‑transit projects and industrial park plants. As a high‑grade upgraded fire‑resistant insulation material dedicated to duct systems, it serves as a superior alternative to standard rock‑wool for modern building fire‑safety systems.

1. Key Performance Advantages

1. A1 Non‑combustible, Reliable Fire Safety

Classified as A1, the highest grade of non‑combustibility, the product is a fully inorganic fire‑resistant material. When exposed to fire, it prevents the spread of open flames, produces no molten drips, low smoke emission and releases no toxic fumes. It effectively eliminates risks including duct‑assisted combustion and flame propagation, fully meeting fire acceptance requirements for smoke‑extraction ducts in building projects.

2. High‑temperature Dimensional Stability, Resists Fire‑induced Collapse

Its melting point reaches 1000 °C. Under high exhaust gas temperature, prolonged flue gas heating and extreme fire conditions, the board will not shrink, crack, pulverise or detach. It maintains a complete enclosed fire protective layer throughout fire exposure, effectively blocking flame and high‑temperature flue gas penetration and preserving the fire‑resistance integrity of ductwork.

3. Compression & Vibration Resistance for Dynamic Duct Operating Conditions

Tightly interwoven fibres provide high structural integrity and rigidity. The board withstands long‑term wind pressure impact, airflow buffeting and equipment resonance of ventilation duct systems. It resists delamination, hollowing and collapse. Its fire‑resistance and thermal‑insulation performance remain stable after long‑term cladding service, well suited for year‑round dynamic operation of duct systems.

4. Combined Thermal Insulation & Sound Absorption, Multi‑functional Performance

With thermal conductivity as low as 0.040 W/(m·K), it delivers excellent thermal insulation to block outward heat transfer and reduce heat loss. Meanwhile, its porous fibre structure absorbs duct wind noise and airflow friction noise, achieving integrated duct fire protection, thermal insulation and noise reduction.

5. Ultra‑low Moisture Absorption, Suitable for Humid Environments

Water repellency ≥ 98 %. It features excellent water repellent, moisture‑proof and anti‑corrosion properties. It performs reliably in scenarios such as concealed ceiling condensation, underground dampness and duct condensate water. It resists moisture‑induced mould growth, protects duct steel sheets from corrosion and extends the overall service life of duct systems with strong adaptability to varied working conditions.

2. Core Technical Specifications

Melting temperature: ≥ 1000 °C

System compatibility: suitable for 1.0 h / 1.5 h / 2.0 h fire‑resistant cladding systems for smoke‑extraction ducts

Thermal conductivity: 0.040 W/(m·K)

Available densities: 120 kg/m³, 140 kg/m³ (mainstream high‑density grades for duct cladding)

Standard dimensions: 1200 × 600 mm; thickness: 50 mm, 100 mm; non‑standard custom sizes available

Water repellency: ≥ 98 %

Fire classification: A1 Non‑combustible

3. Core Differences versus Ordinary Yellow Rock‑wool (General‑purpose Duct Grade)

Ordinary yellow rock‑wool is a general‑purpose insulation material. When directly used for smoke‑extraction duct fire protection, it tends to shrink, crack and shed fibres under high temperatures, resulting in insufficient fire endurance and hidden risks for project acceptance. Haochen Fire‑Resistant Black Rock‑wool Board adopts a special formulation exclusively developed for duct fire protection. The key differences are as follows:

1. Raw material formulation: Ordinary yellow rock‑wool only uses basalt and dolomite; our product incorporates high‑melting‑point haematite to obtain its natural dark‑brown colour with a higher melting temperature, no artificial dyeing required.

2. High‑temperature stability: Ordinary yellow rock‑wool suffers substantial thermal shrinkage and is prone to failure under fire conditions; black rock‑wool features an extremely low thermal shrinkage rate, maintains full structural integrity at high temperatures and firmly clads duct surfaces.

3. Fire‑resistance performance: Ordinary yellow rock‑wool only offers basic thermal insulation and cannot stably achieve 1.5 h / 2.0 h long‑duration fire resistance. Black rock‑wool is purpose‑built for duct fire‑resistant cladding and meets fire‑safety ductwork standards.

4. Vibration‑resistant durability: Ordinary yellow rock‑wool has soft fibres and easily delaminates or collapses under continuous duct vibration. Black rock‑wool has dense, compact fibres with superior compression and vibration resistance to adapt to sustained dynamic duct operation.

5. Project positioning: Ordinary yellow rock‑wool is for general insulation only. This black rock‑wool board is a dedicated fire‑protection core material for smoke‑extraction and ventilation ducts, designed for passive fire‑protection, delivering higher project acceptance rates.

4. Application Scenarios

Fire‑resistant cladding for smoke‑extraction ducts, fire‑protection thermal insulation for positive‑pressure air‑supply ducts, thermal insulation and noise reduction for HVAC ventilation ducts, fire and moisture protection for underground car park ductwork, fire‑safety retrofitting for ducts in commercial complexes, hospitals, industrial plants and high‑rise buildings, and integrated fire‑stopping projects for duct systems.

Haochen Product Assurance

Haochen Fire‑Resistant Black Rock‑wool Board is supplied directly from the original manufacturer. It features low slag‑ball content and evenly distributed fibres, ensuring stable fire‑resistance performance across production batches. All indicators comply with relevant duct fire‑protection specifications. We maintain sufficient stock and support customisation for non‑standard thickness and density. Professional material and specification selection technical guidance for projects is provided, delivering one‑stop engineering solutions for fire‑resistant cladding of smoke‑extraction and ventilation ducts.