ISO 10545-4:2019 Ceramic tiles – Part 4: Determination of modulus of rupture and breaking strength. This document specifies a test method for determining the modulus of rupture and breaking strength of all ceramic tiles. NOTE ISO 13006 provides property requirements for tiles and other useful information on these products. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 4 8-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between 10 IRHD and 100 IRHD 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following aidresses: — ISO Online browsing platform: available at https://www.iso.org/ohp — IEC Electropedia: available at http://www.electropedia.org/ 3.1 breaking load force necessary to cause the test specimen to break, as read from the pressure gauge (see Figure 1) 3.2 breaking strength S force obtained by multiplying the breaking load (3.11) by the ratio (span between support rods)/(width of the test specimen) 3.3 modulus of rupture R quantity obtained by dividing the calculated breaking strength (3.2) by the square of the minimum thickness along the broken edge 3.4 work size thickness thickness of the tile specified by the manufacturer 4 Principle Determination of the breaking load, breaking strength, and modulus of rupture of a tile by applying a force at a specified rate to the centre of the tile, the point of application being in contact with the proper surface of the tile. 5 Apparatus 5.1 Drying oven, capable of being operated at (105 ± 5) °C. Microwave, infrared or other drying systems can be used provided that it has been determined that equal results are obtained. 5.2 Recording pressure gauge, accurate to 2,0 %. 5.3 Two cylindrical support rods, made of metal, the parts in contact with the test specimens being covered with rubber having a hardness of (50 ± 5) IRHD, measured in accordance with ISO 48-2. One rod shall be slightly pivotable (see Figure 2) and the other shall he slightly rotatable about its own axis. See Table 1 for relevant dimensions.ISO 10545-4 pdf download.
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