The Oxygen Generation Performance of Hollow-Structured Oxygen Candle for Refuge Space

Figure 4

The process of experiments: (a) sodium chlorate; (b) Mn powder; (c) cobalt(II,III) oxide; (d) kaolin; (e) well-mixed powder of the oxygen candles; (f) mold manufactured; (g) oxygen candles at different r; (h) axial compressive strength test; (i) radial compressive strength test; (j, k) wrapping of the OCBs; (m, n) the oxygen candles after combustion.