What are fillers and what role these fillers play in soap?

<p><span data-teams="true">This is a short answer type question as classified in NCERT Exemplar</span></p><p>Some substances are added to soap to affect the properties in order to make it useful for a particular application, are called fillers. For example, glycerol is added in shaving soaps, to prevent it from rapid drying. Laundry soaps contain fillers like sodium rosinate, sodium silicate, borax and sodium carbonate to increase their leather forming ability. In medicated soaps, substances of medicinal value are added. In some soaps deodorants are also added.</p>

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