Retraction note: The study of the properties of carbonized cassava cortex/epoxy composite for electrical insulation (The International Journal of Advanced Manufacturing Technology, (2019), 104, 1-4, (1285-1292), 10.1007/s00170-019-04062-w)

The Editor-in-Chief has retracted this article. Figure 2a and b appear to overlap with Fig. 1b and c in [1], Fig. 2b in [2], Fig. 2a and b in [3], Figs. 2 and 3 in [4], Fig. 2a in [5], Fig. 1b and d in [6], Fig. 1b in [7], Fig. 1b in [8] and Fig. 1b in [9], often describing different materials. Table 3 in this article appears to be highly similar to Table 3 in [8] and Table 3 in [9]. The Authors have not provided a sufficient response to concerns. The Editor-in-Chief no longer has confidence in the results and conclusions of the article. Authors Victor Aigbodion and Augustine Omah disagree with this retraction.