If the poor thermal stability of coal, coal charging hind can because of be heated and produce split, broken, so they will improve furnace resistance and increase the number of bring out content.

It is pointed that Durafibers added in concrete improve its split tensile strength more, approximately 14.6%, and its shrinkage-resistance increasing obviously.

In the split-phase motor, the startup winding is designed with a higher resistance than the running winding.