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Correlation of the effect of 20 min of use followed by up to five decontamination cycles in an oven (75 °C for 45 min; blue) or autoclave (red) on the performance of surgical masks (A, B, C, D, E, F) and respirators (G, H, I, J, K, L). Performance was measured by air permeability (Ap) (l/m2/s) (A, D, G, J); burst resistance (Br) (bar) (B, E, H, K); and pressure differential (Pd) (Δp) (C, F, I, L). *P < 0.05; **P < 0.01; ***P < 0.001. ns, not significant.
