IS 651 2007 Glazed Stoneware Pipe and Fittings
7.5 Test for Alkali Resistance Pipes and fittings shall be tested to the action of magnesium sulphate in accordance with the procedure given in Annex B. There shall be no evidence of pitting, softening, spalling or cracking in the pipe or fitting after the test. 7.6 Crushing Strength Test When tested along the fill length of the pipe barrel
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