| 
      where, C= composite, IDT = initial decomposition temperature, FDT= final decomposition temperature.
        | Sample Hs-g-poly-
 | Pg | TGA | DTA |  
        | IDT | FDT | %    Residue | Peaks in °C(μV) |  
        | H. sabdariffa | - | 225.7 | 463.0 | 20.00 | 139.7    (6), 327.9 (18.0), 422.7 (14) |  
        | (EA) | 117.3 | 312.4 | 500.0 | 06.70 | 125.0    (2), 361.2 (1.2), 432.5 (29) |  
        | (EA-co-BA) | 112.2 | 300.6 | 486.0 | 08.00 | 159.0    (1.8), 357.8 (3.9), 385.3 (19) |  
        | (EA-co-VA) | 36.1 | 268.0 | 470.0 | 13.30 | 178.4    (19.1), 348.0(23), 424.0 (23.7) |  
        | Phenoplast | - | 500.0 | 600.0 | - | 551.0    (150) |  
        | Hs-r-PF-C | - | 540.0 | 680.0 | 10.0 | 610.0    (164) |  |