Sodium tri-polyphosphate in combination with pomegranate rind extracts as a novel fire-retardant composition for cellulosic polymer

  • S. Basak
  • S. Wazed AliEmail author


For the first time, a mixed formulation of the sodium tri-polyphosphate (STPP) and the pomegranate rind extract (PRE) has been imparted to the cotton fabric to make it flame-retardant. It was found that the control, 3% STPP and PRE-treated cotton fabric showed the limiting oxygen index (LOI) value of 18, 21 and 26%, respectively, and completely burnt within 80, 120 and 420 s, respectively, in the vertical flammability test. On the contrary, (PRE + 2% STPP)-treated cotton fabric showed the LOI value of 35% with a specific char length of 30 mm. Thermo-gravimetric analysis of the control, PRE- and the 3% STPP-treated cotton fabric showed only 1–2% remaining char mass at 550 °C, whereas the (PRE + 3% STPP)-treated fabric registered the char mass retention of more than 10% at the said temperature. Cone calorimetric data showed that the peak heat release rate for the treated fabric has been reduced dramatically compared to the heat release value of the control cotton fabric.

Graphical abstract


Fire retardancy Pomegranate rind extract (PRE) Sodium tri-polyphosphate (STPP) Char length Thermo-gravimetry Cone calorimeter 



The authors would like to thank the Central Institute of Research on Cotton Technology, Indian Council of Agricultural Research, Mumbai, Government of India, for sponsoring doctoral research work of the one of the authors (S. Basak) of this paper.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Textile TechnologyIndian Institute of Technology, DelhiHauz KhasIndia

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