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a property of a surface describing its ability to prevent slippage; one of the selected parameters is usually used to express this property:

slip resistance class according to DIN 51130 – R9, R10, R11, R12, R13

slip resistance class according to DIN 51097 – A, A+B, A+B+C


Coefficient of friction

the testing of this parameter is subjective and the result most often cannot be replicated; however, even with identical measuring conditions, it may be burdened with error; when choosing tiles, we should be guided by our individual perception of this parameter, and we should also consider the target location of the tiles; it should also be remembered that tiles with a higher coefficient of friction will be more difficult to keep clean.

shortened description of tile dimensions expressed in centimetres, e.g. 30x30 may mean both 301.5x301.5 mm and 297.0x297.0 mm; in order to accurately describe the size of a tile, it is necessary to specify its dimensions and calibre.

fully fired tiles with a moisture absorption rate of less than 0.5%; gres tiles are characterised by high density and considerable frost resistance, thanks to which they can be used both indoors and outdoors, in residential and public utility buildings, as floor, wall and façade cladding.

tiles made from gres mass, where an additional decorative effect is achieved by applying finishing surfaces, such as printing or glazing on the face of the tile; these can be applied on both full-body coloured or standard tiles.

physical resistance of tiles to multiple temperature changes (freezing and thawing); this feature makes it possible to use the tiles outside or in places where the temperature periodically drops below 0⁰C; this property is strongly linked to water absorption.

percentage (by mass) of water that can be absorbed by the tile; low water absorption indicates high density and frost resistance properties.

the term refers to the surface of tiles which, after firing, are not subject to additional mechanical treatment; tiles with a natural surface also include textured tiles.

the ability to remove dirt from the tile surface; the resistance to staining test consists in applying test solutions to the tile, cleaning it and evaluating the surface; the classification is based on the cleaning method which results in the complete removal of solutions from the tile surface; the higher the stain resistance class, the easier it is to remove dirt; usually a high stain resistance class does not go hand in hand with good slip resistance properties.

this parameter applies only to glazed tiles and describes the abrasion resistance of the tile surface during use; the test consists in abrasive wear of the tile surface with rotating abrasive elements and then visual evaluation; depending on the number of rotations at which a visible change appears on the tile surface, an appropriate abrasion resistance class is assigned to the tile; the higher the number of rotations at which the change is visible, the higher the abrasion resistance – the better performance of the tile and a wider possibility of using the tile in places exposed to more intensive use.

is a process of mechanical edge processing of tiles by grinding them to the required dimensions; rectified tiles can be laid without fear of dimensional discrepancies; maximum dimensional discrepancies between rectified tiles are limited to tenths of a millimetre.

this term refers to the surface of tiles which, after the firing process, are not subject to additional mechanical processing, and the uneven face of the tile is formed during the pressing process using a texture press; textured tiles often imitate the texture of the surface of, e.g. natural stone or its symmetrical pattern, which ensures the highest slip resistance class; the use of the texture has a particular effect on increasing the slip resistance properties according to DIN 51097 (the so-called barefoot slip test), in which the test is carried out on a wet surface and the water entering the grooves in the texture does not form an even film on its surface, which significantly improves this parameter and allows the use of these tiles in more demanding places, e.g. wet surfaces next to swimming pools.