HB21 inorganic man made rock wool mineral fiber reinforcing fiber for break pads and linings

Short Description:

Mineral wool is any fibrous material formed by spinning or drawing molten mineral or rock materials such as slag and ceramics. Mineral wool is also known as mineral fiber, mineral cotton, mineral fibre, man-made mineral fibre (MMMF), and man-made vitreous fiber (MMVF). “Man-made mineral fibre (MMMF) is a generic name used to describe an inorganic fibrous material manufactured primarily from glass, rock, minerals, slag and processed inorganic.Specific mineral wool products are stone wool and slag wool.

Stone wool is a furnace product of molten rock at a temperature of about 1600 °C. Our rock wool fiber HB21 is made of basalt, diabase and dolomite and made into inorganic silicate fiber by blowing or centrifugation at high temperature. Original color of pure rock wool is gery-green. In order to make it better combined with other friction materials, we will add some liquid phenolic resins in the curing furnac, then it turned to yellow-green. After length fixing and slag removal(non-fibrous particle called shotin the fiber), the final product is a mass of fine, intertwined fibres with a typical diameter of 2 to 6 micrometers.

Product Detail

Product Tags






SiO2+Al2O3 (wt%)


CaO+MgO (wt%)


Fe2O3 (wt%)


Others(max; wt%)


Ignition loss (800±10℃,2H; wt%)






Melting Point


Fibre diameter numerical average(μm)


Fibre length weighted average(μm)


Shot content (>125μm)


Specific density(g/cm3)


Moisture Content(105 ℃±1℃,2H; wt%)


Surface Treatment Content(550±10℃,1H; wt%)



Asbestos Detection


RoHS Directive(EU)


Safety Date Sheet(SDS)




Friction materials

Sealing materials

Road construction

Coating materials

Insulation materials

Rock wool mineral fiber can be applied to friction&sealing, coating, Insulation, road engineering and etc.

Our products are used in mainly friction applications. Braking is the result of a surface interaction between brake disc and friction material. The performance of the brake system is influenced by the formulation of the friction material. A typical friction material consists of 10 - 20 raw materials. Each raw material has a unique chemistry, size and shape and therefore a unique functionality. Finding the right balance between these functionalities is crucial in the development of friction formulations. Each raw material, including mineral fibres, has a specific function. The main purpose of mineral fibres is to facilitate other raw materials to work properly under any braking condition. They can also be engineered for different contributions to friction formulations from a tribologic point of view. The final performance of the friction material always depends on the synergy between all raw materials.


● Non asbestos
Our slag wool mineral fiber has no asbestos and can be ideal alternatives of asbestos for friction application. What’s the most important, it is at far lower price than asbestos.

● Low Ignition loss
At high temperature, some inorganic substances in mineral fibers will be burned off, resulting in fiber loss on ignition rate. Slag wool mineral fiber are pure inorganic fiber without any organic composition, so it hardly have a fiber burn rate.

● Very low shot content
The HB11X shot content can be controlled below 2% after six times of shot removal process. Shot will bring wear and noise. Shot content is one of the standards to velue fiber quality.

● Excellent stability
Excellent stability, temperature resistant, corrosion resistant, moisture resistant and wear resistant.

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