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XRD results of cookware heated at different temperatures (as-received, 250 °C, & 350 °C for 2 h supplied by different suppliers: (a) PTFE Manuf-1; (b) Granite Manuf-4; (c)PTFE Manuf-2; (d) Granite Manuf-5; (e) PTFE Manuf-3; (f) Granite Manuf-6.
