What is rock mineral wool and how is it obtained?


Unlikeother types of insulation materials, rock mineral wool is the only thermal insulationmaterial that simultaneously provides thermal, acoustic and fire protection ofbuildings.  

Rock mineral wool insulation ensures energy savings and the money you invested in insulation may be returnedwithin several years – which makes your return on investment extraordinary!  

Using a state of the art technology,Knauf Insulation manufactures a wide range of top quality rock mineral wool productsfor diverse application: pitched and flat roofs, external, internal andpartition walls, floors on the ground and mezzanine floors.


Knauf Insulation rock mineral wool is waterproof,vapour-permeable, resistant to chemicals and microorganisms, durable, it doesnot enhance the growth of bacteria and moulds and it is recyclable.


Rock mineral wool is an insulation material of inorganic origin intended forthermal and acoustic insulation, as well as for fire prevention in civilengineering, industry and the shipbuilding industry. Raw materials used for theproduction of rock mineral wool are stone of volcanic origin (diabase and dolomite, andin lesser extent basalt) and so-called briquettes (obtained by the recycling oftechnological process waste with the addition of cement – such a recycling providesa closed circle of recycling and waste).

1. Major chemical compounds included in the composition of the mentionedraw materials are oxides of silicon, aluminium, calcium, magnesium and iron. Inaccordance with formulations, the raw materials are added in a cupola furnacewhere they are melted at the temperature of 1300°C. In this raw materialmelting process, coke is used as an energy source. As an additional energysource, oil is used for the incineration of flue gasses. 

2. With an up-to-date flue gasses purification system, dust and carbonmonoxide are eliminated, while a great part of energy returns to the productionprocess. The mass obtained in the melting process in the cupola furnace isbrought to the wheels of a centrifuge where this mass is unraveled into fibers.The centrifuge wheels break the mass into drops; through the wheels, air isblown in to stretch the obtained drops into fibers. Through a mist of yarn, thefibers are blown into a collecting chamber and this is how primary felt of rock mineral wool is obtained.  



Primary felt prior to entering the polycondensation chamber 

3. Primary felt then reaches a wool precipitation system – the so-calledpendulum system that enables achieving excellent insulation characteristics byproviding a uniform distribution of fibers and high level of their intertwinement,thus providing more space for »air retention«, which is one of the mostimportant conditions for insulation material functioning. 

4. In the polycondensation chamber, the process of polycondensation or binderfixing is carried out which together with fiber binding provides technicalcharacteristics of the product. The process is carried out at 270°C with waterevaporation and fixing of the binder added in the mass unraveling phase. Allflue gasses are incinerated and purified, thus closing the circle of fluegasses release. 



Felt entering the polycondensation chamber

5. The chamber process is followed by cutting of final products intorequired dimensions, their stacking and packaging. 

Cuttingof slabs into required dimensions 


Completedproduction process and closed recycling circle.


For more details abouteach product, please click on the link to the left.