Impregnation and secondary baking


Asphalt impregnation is a process that can reduce the porosity of the product, increase the density, increase the compressive strength, reduce the resistivity of the finished product, and change the physical and chemical properties of the product.

After roasting and impregnation, it is necessary to perform a second roasting to carbonize the asphalt immersed in the roasted product.

Electrode and connector blanks with high bulk density require secondary firing, and some require three-leaf four-bake or two-leaf three-bake.