Tech

The most important must-know technical info about tiles

Mohs scale

Mohs scale

To give to the consumers an idea of scratch resistance of tiles, the manufacturers sometime use the MOHS Hardness Scale as per chart beside. Glazed porcelain is normally rated as grade 7 on this scale. However PEI is more reliable, testable and measurable system.

Optical Hazing

Optical Hazing

The surface of Polished Porcelain while highly glossy does not reflect light in the same way as a mirror. In some lighting conditions variations in the reflective properties may be noticeable. This is known as 'Optical Hazing' and is an inherent characteristic of polished porcelains. - by Craft Decor, Freemantle, WA -


PEI

PEI

PEI stands for "Porcelain Enamel Institute." PEI ratings help you determine the hardness and durability for tile. Tile that experiences much foot traffic should be harder and denser than than that receives no foot traffic. Tile installed on a wall receives no foot traffic and, in fact, almost no wear of any kind. As such, this tile can be thinner and provide less friction, since safety is not a concern.


Slipperiness Starstile advice

Slipperiness Starstile advice

Slipperiness tests are different from each other and they provide final results which are not omogeneus one another, with no clear correspondence. Countries are adopting different standards based on different tests, so the only way to know whether your product is suitable for an installation is to ask the producer about the result of the needed test - if available - and make sure you got its approval, wherever the authorities of your country are requiring a specific technical characteristic about slip rating.

Slipperiness - Dynamic coefficient of friction

Slipperiness - Dynamic coefficient of friction

something to know : - DCOF measures slip resistance during motion while COF measure slip resistance to put an object in motion. This means the new standard more accurately measures a surface’s slip resistance when walking. - The Dynamic Coefficient of Friction testing standard is always conducted with a wet, slightly soapy solution of .05% Sodium Laurel Sulfate and Water. That is why there is only one score, and not a wet and dry score which was the old standard. - Unlike COF testing, the new DCOF test is more accurate and can be conducted in the field with a portable machine called the BOT3000. - DCOF values of a surface will change over time. Understanding a material’s abrasion resistance and overall strength will help predict the durability of the finish. ( Mosa Magazine on line)


Slipperiness - R-rating and ABC rating

Slipperiness - R-rating and ABC rating

R-rating -DIN 51130- is a shod foot test which uses oil as a contaminant. These results are interpretated into 5 groups, R9 to R13, being R9 the slipperiest and R13 the least. R9 is not suitable for areas requiring slip resistance. ABC rating -DIN 512097- is a wet barefoot where a soap solution is applied as a contaminant and the results are placed into 3 classes: Class A dry areas, dry barefoot corridors Class B class A plus pools surrounds, communal showers, pool beach areas, wet change areas Class C ClassA and B plus pool surround inclines, walk through pools, jacuzzi floors and seats, inclined pool edges and step.


Slipperiness - Wet Pendulum Test

Slipperiness - Wet Pendulum Test

The wet pendulum slip test classifies the slip rating of surfaces with water contamination. It is tested using a Pendulum friction tester. The British Pendulum Number -BPN- is the individual measurement. A minimum of 5 specimens must be tested and the average of those is the Slip Resistance Value -SRV-. The slider number used for the test must be clearly specified. The table in front is the classification of the P-rating.


V-rate shade variation

V-rate shade variation

The V-rate is important to identify the level of shade variation from tile to tile and the overall effect of the final installation of the tiles. It has 4 different level of variation as shown by picture. - by www.tileamerica.com -

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