Tiles technical features

The coefficient of friction provides an indication of the degree of floor slipperiness.
The B.C.R.A. method (English) measures a surface’s coefficient of dynamic friction (μ) and classifies:

μ <0,19 - dangerous slipperiness;
0,20< μ < 0,39 - excessive slipperiness;
0,40< μ < 0,74 - satisfactory friction;
μ >0,75 - exellent friction.

The DIN 51097 method for bathroom floors and wet feet (see swimming pools) applies the inclined plane method. The standard includes the angles of slippage. Angle classification: A >12°; B >18°; C >24°. 

DIN 51130 for the prevention of accidents and industrial safety, classification of flooring materials in terms of the critical angle of slippage. (Angle -> Group): (>6°-10°-> R9); (>10°-19°-> R10); (>19°-27°-> R11);(>27°-35°-> R12), (>35°-> R13).

Ceramic tiles bending resistance is the maximum load applied at three points that the tile can bear without breaking. The level is expressed in N/mm2 and ISO 10545/4 standard defines the following minimum acceptable settings:

BIa 35
BIb 30
BIIa 22
BIIb 18

Ceramic tiles resistance to chemicals is the capacity of the glaze at room temperature to tolerate contact with chemicals (domestic products, staining chemicals, pool additives, acids and solvents) without alteration in its appearance.
Under standard, tiles are classified in decreasing order of resistance for all chemicals, exept stains, as follows:


Resistenza chimica

Method applicable to all working surfaces of ceramic tiles to determine their resistance to stains.
Each staining agent must remain on at least 5 testing samples, for at least 24 hours, whose working surface has been cleaned and dried beforehand. Removal of the staining agents takes place in subsequent steps using various cleaning agents and cleaning procedures:

CLASS 5: the stain is removed using hot water;
CLASS 4: the stain is removed using a weak commercial cleaning agent;
CLASS 3: the stain is removed using a strong commercial cleaning agent;
CLASS 2: the stain is removed using solvents, such as acetone for example.

All Marca Corona products satisfy CLASS 5.

Ceramic tiles abrasion resistance is the capacity of the glaze surface to resist the wear caused by foot traffic or the abrasion caused by mechanical equipment (lift trucks, etc.). The wear action is strictly linked with the mechanical agent (rubber sole, leather sole, etc.), the material carried onto the surface (water, sand, mud, etc.) and the classified in five categories depending on the areas they are to be used in:

PEI I - Tiles for areas with ligth traffic and without abrasive dirt, e.g. bathrooms, bedrooms.
PEI II - Tiles for areas with average traffic and medium to low abrasion, e.g. studyng rooms, living rooms.
PEI III - Tiles for areas with higt medium to high traffic and average abrasion, e.g. foyer, kitchen in private residences.
PEI IV - Tiles for areas with intense traffic, e.g. restaurants, offices, shops, public offices (excluding floors under cash desks and shop counters and narrow unavoidable passageways).
PEI V - Tiles for areas with especially intense traffic.

Method only applicable to unglazed ceramic tiles. The testing method and the expression of results are the same as those indicated in the previous European Standards (EN 102). Only one modification has been made regarding the material to be used for the calibration of the instrument. The calibration procedure remains unchanged.
All fine full-body coloured porcelain stoneware products conform to the values required by the ISO 10545/6 standards.

Frost resistance is a quality tiles have when they are subjected to water at temperatures lower than 0°C without being damaged by stress generated by their moisture content freezing. The tiles are defined as resistant or not. 

Ceramic tiles resistance to thermal shock is the capacity of a glazed surface not to suffer visible alteration because of the "shock" caused by the difference in temperature. The test involves a number of repeated cycles with the tile immersed in water at room temperature, after which it is placed in an oven at temperature higher than 105° C. On the basis of the test, the tile is defined as resistant or not.