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Modified sodium disilicate, with molecular formula of Na2O·2SiO2 and commercial designation of MDS, is manufactured through special process of adding active auxiliaries into sodium silicate. The pH value is within 10.5 – 12.5, Bulk density within 0.3—0.70g/ cm3. As a phosphorous-free detergent auxiliary, the modified sodium disilicate (MDS) satisfies all technical and ecological requirements for substitute of STPP.