Page 456 - Handbook of Thermal Analysis of Construction Materials

Section 4.0 - Magnesium Oxychloride and Oxysulfate 431

Figure 22. Differential thermal analysis curves (DTA) and differential weight loss curves
(DTG) of magnesium oxychlorides. The composition of the phases identified are indicated
above the curves: [18]
5-Form, 5Mg(OH) •MgCl •7.93H O;
2
2
2
3-Form, 3Mg(OH) •MgCl •7.68H O;
2
2
2
2-Form, 2Mg(OH) •MgCl •4.14H O;
2
2
2
9-Form, 9Mg(OH) •MgCl •5.68H O.
2
2
2
Table 1. Peak Temperatures for Magnesium Oxychloride Phases
Phase DTA (°C) DTG (°C)
3-form 145, 170, 220, (378), 96, 123, 177, (348),
430, 505 398, 425
5-form 157, 184, 218, 364, 100, 135, 173,
411, 478 328, (380), 398
2-form 245, 284, 462, 486, 188, 268, 418,
546 469
9-form 173, 292, 368, 452, 162, 242, 316, (366),
481 388
*Figures in parentheses refer to minima or maxima.