AS ISO 10545.9 pdf download

AS ISO 10545.9 pdf download.Ceramic tiles Method 9: Determination of resistance to thermal shock
1 Scope
This part of ISO 10545 specifies a test method for determining the resistance to thermal shock of all ceramic tiles under normal conditions of use. Depending on the water absorption of the tiles, different procedures (tests with or without immersion) are used unless there is an agreement to the contrary. NOTE ISO 13006 provides property requirements for tiles and other useful information on these products.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 10545-3, Ceramic tiles — Part 3: Determination of water absorption, apparent porosity, apparent relative density and bulk density
3 Principle
Determination of the resistance to thermal shock of a whole tile by cycling 10 times between the temperatures of 15 °C and 145 °C.
4 Apparatus
4.1 Low-temperature water bath, through which cold water flows at (15 ± 5) °C. One example is a bath 55 cm long, 35 cm wide and 20 cm deep, with a water flowrate of 4 l/min. Any other suitable apparatus may be used. For the case of testing with immersion, applicable to all tiles having a water absorption coefficient less than or equal to a mass fraction of 10 % (determined in accordance with ISO 10545-3), the bath shall not be covered and shall be of sufficient depth to allow the tiles to be placed vertically and immersed completely. For the case of testing without immersion, applicable to glazed tiles having a water absorption coefficient greater than a mass fraction of 10 % (determined in accordance with ISO 10545-3), the bath shall be covered with a thick aluminium plate in such a manner that the water, directed towards the surface, is in contact with the plate. The aluminium plate shall be covered with a layer approximately thick of 5 mm aluminium granules with diameters in the range of 0,3 mm to 0,6 mm. 4.2 Oven, capable of being operated at 145 °C to 150 °C.
6 Procedure
6.1 Preliminary check of the test specimens First examine the tiles for visible defects by viewing them with the naked eye (or with the aid of spectacles if usually worn) from a distance of 25 cm to 30 cm under a minimum illumination of 300 lux. All test specimens shall be free from defects at the commencement of the test. The methylene blue solution described in 6.5 may be used to detect pre-test defects. 6.2 Test with immersion In the case of low-porosity tiles having a water absorption coefficient less than or equal to 10 % of their dry masses, immerse them vertically in cold water at (15 ± 5) °C so that the tiles are not in contact with each other. 6.3 Test without immersion In the case of glazed tiles having a water absorption coefficient greater than 10 % of their dry mass fractions, place the glazed face downwards in contact with the aluminium granules over the cold-water bath (4.1) maintained at (15 ± 5) °C. 6.4 Temperature cycling For both tests, after 15 min at the low temperature, immediately transfer the test specimens to the oven (4.2) maintained at (145 ± 5) °C until a uniform temperature is achieved (usually 20 min), then immediately transfer them back to the low-temperature conditions. Repeat this process 10 times. 6.5 Examination Then examine the test specimens for visible defects by viewing them with the naked eye (or with the aid of spectacles if usually worn) from a distance of 25 cm to 30 cm under a minimum illumination of 300 lux. To assist in detecting defects, a suitable stain (such as a 1 % aqueous solution of methylene blue containing a small quantity of wetting agent) may be brushed onto the proper surfaces of the test specimens. After 1 min, wipe off the stain with a damp cloth.