Specification

Product Testing and Attributes
In order for a tile to be considered for a particular application, various test results must be considered in addition to defining its final use. Usage charts are provided as a general guide only. Actual job site
conditions may change a product’s suitability for a specific application. If special conditions apply; an Emser Tile
®
representative should be consulted prior to material selections. All testing is conducted in a
lab environment and represents the specific specimens being tested. New production runs, actual jobsite conditions, as well as the handling and installation of products may alter the performance
results. For the most current testing results and application usage guide please visit our website at emser.com. The testing and information that should be looked at prior to making selections are as follows:
Water Absorption - ASTM C373
Water absorption is the measurement of density, porosity and specific gravity of a
product. It is used as a tool for identifying structural properties of the body of the tile that
may be required to determine use in a given application. Tiles are classified according to
water absorption percentages as follows:
Impervious tile:
<
0.5%
Vitreous tile:
>
0.5% -
<
3%
Semi-vitreous tile:
>
3% -
<
7%
Non-vitreous:
>
7% -
<
20%
Breaking Strength - ASTM C648
Breaking strength is measured by applying force to an unsupported portion of tile until
breakage occurs. The results are expressed in lbf (pounds of force). This test covers the
determination of the breaking strength of glazed and unglazed porcelain and ceramic
floor tiles, wall tiles, mosaics, quarry tiles, and paver tiles. Ceramic/Porcelain tiles used on
floors and walls must be able to withstand the expected load bearing capacity of various
installations and must meet >250lbf to be considered suitable for floor use. This is a very
different measurement of force than PSI and there is no direct conversion of pounds of
force to pounds per square inch.
Chemical Resistance - ASTM C650
The chemical resistance test is intended for tile that will be used for lavatories, food
counters or similar residential, commercial or medical installations. A tile sample is placed
in continuous contact with a variety of chemicals for 24 hours, rinsing the surface and
then examining the surface for visible variation. These results are typically measured as a
pass or fail.
Freeze Thaw Cycling - ASTM C1026
The freeze thaw cycle test measures a tile’s resistance to various stages of freeze cycles.
The first step involves soaking the tile in water using a vacuum method to ensure its
pores are properly saturated before it is subjected to freezing temperatures. The tile is
then monitored for failures. As water expands when it freezes, tiles that are not suitable
will show stress cracks, or simply break apart. These results are typically reported as a
pass or fail.
Scratch Hardness - MOHS Scale
Scratch hardness is the tile surface resistance to scratching by different minerals, the
softest being talc (1) and the hardest being diamond (10). The MOHS scale of hardness is
the most common method used to rank gemstones and minerals according to hardness.
Abrasion Resistance - ASTM C1027
Abrasion resistance measures the visible surface abrasion of glazed porcelain and ceramic, glazed
quarry, and glazed mosaics by subjecting the test specimens to a rotating abrasion wheel. This test
is monitored for failures after a certain number of cycles. Below is the classification for this test:
0: Wall use only- 100 rotations
I: Residential, light traffic- 150 rotations
II: Residential, medium to light traffic- 600 rotations
III: Residential, heavy traffic; Commercial, light traffic- 750-1,500 rotations
IV: Commercial, considerable traffic- 2,100-12,000 rotations
V: Commercial, heavy traffic- >12,000 rotations plus dye test
*Deep Abrasion ASTM C1243 must be used for unglazed products
Deep Abrasion Resistance - ASTM C1243
Deep Abrasion resistance measures the volume removed from an unglazed tile that is subjected to a rotating
abrasion wheel. Below is the classification for this test:
Class 1: Pressed, extruded, other with <0.50% water absorption - maximum loss 175mm3 175mm3
Class 2: Pressed with >0.50%-3.0% water absorption - maximum loss 225mm3
Class 2: Extruded, other with >0.50%-3.0% water absorption - maximum loss 275mm3 Class 3: Pressed with
>3.00%- 7.00% water absorption - maximum loss 345mm3
Class 3: Extruded, other with >3.00%- 7.00% water absorption - maximum loss 393mm3 Class 4: Extruded,
other with >7.00%-20.00% water absorption - maximum loss 2,365mm3 Class 4: Pressed with >7.00%-20.00%
water absorption - maximum loss no requirement
Dynamic Coefficient of Friction - ANSI A137.1 and A326.3
The coefficient of friction measurement is an evaluation of a tile surface under known conditions using a
standardized sensor material. It provides a useful comparison of tile surfaces, but it does not predict the
likelihood a person will or will not slip on a tile surface. DCOF (Dynamic Coefficient of Friction) specifically tests the
friction of an object that is already in motion (kinetic). The BOT3000E (Binary Output Tribometer) is a machine that
runs approximately 8” across a surface, measures the DCOF of the tile and provides a digital reading with the
results. Because this machine is automated, it objectively measures the slip resistance and most importantly
provides repeatable results. ANSI A137.1 recommends, but does not require, a wet result of 0.42 or greater for
interior surfaces that are intended to be walked on wet. If the surface is not intended to be walked on wet then a
different value may be specified. Some surfaces intended to be walked on wet should be >0.60 depending on
final traffic type and use, so specification of “>0.42” may not be sufficient. Although there are no ADA or OSHA
benchmarks for DCOF values in the current guidelines and codes for interior applications, Emser recommends a
DCOF of 0.50 or greater for covered exterior floor applications as well as interior commercial dining areas due to
the presence of grease, water and other contaminants. Emser also recommends that all exposed exterior floors
that will be walked on wet meet 0.60 DCOF. If the floors will not be walked on when wet then a lower DCOF may be
suitable. There is no direct conversion of ANSI DCOF values to European ISO R-values, however a comparison
range can be provided by request.