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Brief characteristic and use of unglazed stoneware NK

Unglazed stoneware -floor tiles, architectonic units and garden pots NK are an up-to-date results of production verified by ages. The contemporaneous conception of the traditional production technology based on natural materials without any chemical additions predetermines high quality and singularity of these products. Natural stoneware is formed by pulling raw refractory clay, adhesives and traditional natural complementary materials without any colouring and synthetic additions. Final products are environmentally-friendly and satisfy the highest environmental requirements.

This sort of unglazed stoneware floor tiles, components and garden pots is kilned in special high temperatures. In the heat of 1.270°C the products get physical characteristics which allow their using and fitting in the most demanding aggressive industrial plants.

The special way of firing gives to the stoneware floor tiles and garden pots their typical colour between pale and dark ochre and a surface reminding an orange peel. The floor tiles are suitable for exterior and interior and satisfy the highest non-slip requirements. The products are aesthetics building components, especially for state buildings, residences, public free spaces and reconstruction of historical buildings.

Performances of the stoneware NK:

High modulus of rupter

  • individual value
  • saverage
ČSN EN ISO 10545-4
> 19,4 MPa
21,6 MPa
Breking strenght ČSN EN ISO 10545-4 > 2 310 N
Chemical resistance ČSN EN 186-2 without changes
Frost resistance ČSN EN ISO 10545-12 min. 100 cycles
Low watter absorption ČSN EN ISO 10545-9 3,1%
Scratch hardness of surface ČSN EN 186-2 9 acc. to Mohs
Slipperiness ČSN 72 5191 class R 11
class "B"

Static coefficient of friction

  • dry surface
  • wet surface
prEN 102
ČSN EN ISO 10545-17
0,93
0,85

Dynamic coefficient of friction

  • dry surface
  • wet surface
prEN 102
ČSN EN ISO 10545-17
0,84
0,76
Coefficient of linear thermal expansion ČSN EN 103 0,000 004

EG-Declaration of conformity including annex are available to download at www.volny.cz/natural.keramika

All parameters written above were confirmed by accredited and notified testing laboratories TZÚS Praha, TSÚS Bratislava, ZKK Hořice a Zkušebna materiálů, polotovarů  a obuvi Zlín.

Thanks to these properties, the products have a wide range of use e.g. for:

  • interior flooring and exterior promenade
  • pavement around interior and exterior swimming pools including their borders, bottoms in non-swimming pools, enterings into water
  • interior and exterior applications, architectonic arrangements of restaurants, wine restaurants bars and others
  • garden architecture, pavements, walls, staircases, terraces
  • applications of stairs in interiors and exteriors
  • pavements with request of resistance against acids and lyes in grocery and chemical industry, in agriculture, in cooling and freezing areas, in areas for manipulations with waste including droppings or in animal breeding (ZOO free range)
  • face walls
  • reconstructions and repairs of historical buildings