Organic powdery chemicals

A selection of the individual values of Ofi, of some powders are given in Table 12. As shown in the table, organic powdery chemicals, inorganic powdery chemicals, sawdusts and metallic powders take the values of dg of 0.06 0.09, 0.10 0.25, 0.14 0.18 and 0.10 0.30 cm /min, respectively. 

The values of of the eight organic powdery chemicals of the TD type and that of CHC were measured herein by applying the constant-hcating-ratc method and are presented in Table 15 in Subsection 6.7.1, respectively. 

It has been ascertained through a series of measurements performed by means of this apparatus that the values of of 8 12 and 18 20 IC/h are optimum for organic powdery chemicals of the TD type and sawdusts, respectively. 

The result of the above calculation suggests that the condition, UKK A, may hold for 400 cm each of average organic powdery chemicals of the TD type charged each in the 500 cm Dewar flask used in the BAM test and placed each in the atmosphere under isothermal conditions as well and therefore, the spatially uniform distribution of internal temperature may be effected in each of them in the early stages of the self-heating process, with the result that each of them may take the same values of qj and Tuq - Tset-up) as 400 cm of a liquid charged in the Dewar flask and placed in the atmosphere under isothermal conditions (For matters relevant to this subject, refer to Subsection 5.5.1). 

If the above suggestion is reasonable, it follows that it is possible to calculate the individual values of the BAM test for organic powdery chemicals of the TD type after the example of the calculation performed in Section 5.6 and therefore, it is also possible to compare the values of calculated each for organic chemicals of the TD type, irrespective of liquid or powder, with one another, assuming that these chemicals are each placed under the same conditions of shape and size, i.e., under the definite conditions of the BAM test. 

As shown in Fig. 146, the decomposition process of a self-healing organic powdery chemical that first melts and then decomposes cxothcmiically is frequently seen in thermal analysis. And, it has been stated repeatedly herein that such a DTA curve as shown in Fig. 146 is nothing else but that of a... 

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