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2019-1-19 · PEK 10-325-45 = 73. PEK 10-325-90 = 68. PEK 10-325-135 = 68. The mass of sample PEK0-0-0 before heating is considered as 100 %, there will be three curves as shown in figure 3. The change of sample mass at different heating temperatures and holding times with heating rate of 10 °C/h is quite obvious. Figure 3.