LABORATORY A laboratory shall be maintained which shall be suitably equipped and staffed where different tests given in the specification shall be carried out 11 All the testing apparatus shall be periodi cally checked and reco rds of such checks s ID: 66602
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February 1996 tile shall be not leaner than 1:3 by mass. Where colouring material is used in the wearing layer, it shall not exceed 10% by mass of cement used in the mix. The tiles shall be cured in moist condition continuously as required at 5.4. The SHAPE AND DIMENSIONS: Tiles shall be of the shapes dimension and tolerances as specified. Specials and half-tiles shall be strictly as per the requirements specified and shall be within the tolerance indicated. GENERAL QUALITY OF TILES: The general quality and finishing of the tiles LEVELS OF CONTROL: The tests, as indicated in Table 1 and at the levels of control specified therein, shall be carried out on the whole production of the factory covered by this scheme and appropriate records and charts maintained in accordance with paragraph 2 above. All the production which conforms to the Indian Standard and covered by the licence shall be marked with the standard mark. CONTROL UNIT: For the purpose of this scheme all the tiles of same size manufactured from same consignment of raw materials under identical conditions in a week shall constitute a control unit. All the tiles taken for test shall satisfy the requirements of the specification for acceptance of the control unit. If any tile fails to satisfy the requirements of any test, another sample consisting of twice the number of tiles tested initially, shall be taken from the same control unit and tested. If there is any failure to satisfy the requirements of test on these samples, control unit from which the tiles have been selected shall not be marked 7. All the raw materials used in the manufacture of tiles shall be accompanied by test certificates from their suppliers for their conformity to the relevant Indian 8. In respect of all other clauses of the specification and at all stages of manufacture, the factory shall maintain appropriate controls and checks to ensure that their product conforms to the various requirements of the specification. 9. A separate record shall be maintained giving information relating to the rejection of tiles which do not conform to the spe method of their February 1996 IS 13801: 1993 CHEQUERED CEMENT CONCRETE TILES TABLE 1 LEVELS OF CONTROL (Para 6 of the Scheme of Testing and Inspection) TEST DETAILSLEVELS OF CONTROL Test Method Clause Requirements Reference Samples Frequency Remarks 6,7&8 Shape, Dimensions & tolerances. 6,7& IS:13801:93 Every hour production from each mould press Each days production. 9 General quality of tiles. 9 -do- Each tile 10 -do- -do- 11.1 Flatness of the tile surface. 11.1 -do- Every hour production from each mould press 11.2 Perpendicularity 11.2 -do- 11.3 Straightness 11.3 -do- 11.4 Water absorption 11.4 -do- One control unit* 11.5 Wet Transverse strength. 11.5 -do- 7.3 Wearing layer 7.3 -do- 11.6 Resistance to wear 11.6 -do- If any tile fails to meet the requirements of test twice the number of tiles shall be drawn from the same control unit and tested for requirements where failure has occurred,. If any tile from this sample fails, the control unit shall not be marked. * One control unit shall consist of production of tiles of the same size manufactured from same consignment of raw materials under identical conditions in one week. @ Samples shall be so chosen as to be representative of all the days of production. A few tiles from every days production shall be taken so as to form one sample.