Abstract
The oxidation structure in an EMM (Electric Molten Mark) has been often observed in electric wire of fire scene. However, the technique to distinguish between the primary molten mark which is the cause of the fire and the secondary one which is produced in the fire, by observation of oxidation structure, has not been confirmed yet.
In this study, we examined to estimate the surrounding temperature at the formation of an EMM by DAS (Dendrite Arm Spacing) and oxygen concentration in oxidation structure.
The results were as follows; The DAS was dependent on functions of oxygen concentration and cooling rate. The oxidation structure in an EMM, even if it was exposed in fire again, did not change as long as it was not re-molten state. The surrounding temperature at the formation of an EMM was estimated by measuring DAS and oxide concentration.
