Fire Resistance

Technical data & specifications

Resistance to Thermal Shock

The standard test procedure for ceramic/porcelain tiles is EN ISO 10545 – Part 9 Ceramic tiles Determination of Resistance to Thermal Shock. The test procedure is as follows.

  • Test must be performed on at least 5 tiles free from defects at the beginning of the test.
  • The procedure consists in cycling sample tiles ten times between the temperature of cold water and a temperature slightly higher than that of boiling water, generally between 15 and 145 °C. For tiles with a water absorption of under 10%, the lowest temperature is reached by means of the total immersion of the tiles in an uncovered bath with a water temperature of 15 °C. In case of tiles with a water absorption higher than 10%, the water bath must be covered with an aluminum plate on which a layer of aluminum grains is placed; the glazed surface of the tiles must be placed in contact with this layer.
  • In both cases, after 5 minutes at the low temperature, samples must be placed in an oven at 145°C for about 20 minutes and then immediately transferred back to the low temperature conditions.
  • At the end of 10 cycles, the samples are examined for visible defects.


Testing conducted on behalf of Archatrak on Kronos porcelain pavers under EN ISO 10545 – Part 9 showed no visible damage.
The full test report can be downloaded from here.

Spread of Flame

The most relevant fire resistance test for porcelain pavers used in elevated deck applications is generally considered to be ASTM Test Method E108-11 “Standard Method of Fire Tests of Roof Coverings”.

This test method includes simulated fire exposure to the upper surface of the pavers and measures the surface spread of flame and the ability of the roof covering material or system to resist fire penetration from the exterior to the underside of a roof deck under the conditions of exposure.

These test methods also provide criteria to determine if the roof covering material will develop flying burning material, identified as flying brands, when subjected to a 12-mph (5.3-m/s) wind during the simulated fire exposure tests.


Conditions of acceptance for classification by ASTM E108:

At no time during or after the intermittent flame, spread of flame* or burning brand tests shall:

  1. Any portion of the roof covering material be blown or fall off the test deck in the form of flaming or glowing brands that continue to glow after reaching the floor, or
  2. The roof deck be exposed, or
  3. Portions of the roof deck fall away in the form of particles that continue to glow after reaching the floor.
  4. At no time during the Class A intermittent flame or Class A burning brand tests shall there be sustained flaming of the underside of the deck.
  5. * At the conclusion of the spread of flame tests, the flaming shall not have spread beyond 6 feet for Class A, and there shall have been no significant lateral spread of flame from the path directly exposed to the test flame.

Testing was conducted on behalf of Archatrak on Kronos Faggio porcelain pavers on an elevated deck bed with pavers supported on each corner by Eterno SE-3 pedestals set to a height of 3″. A flame temperature of 1400°F +/-50° was applied for 10 minutes with a wind velocity of 1056 ft./min with the tiles angled at 5″ per horizontal foot.

Kronos porcelain pavers met the Class A Spread of Flame requirements when tested in accordance with this ASTM Test Method E108-11.
The full test report can be downloaded from here.