''Natron, a disinfectant and desiccating agent, was the main ingredient used in the mummification process. ... By removing the organs and packing the internal cavity with dry natron, the body tissues were preserved. The body was filled with Nile mud, sawdust, lichen and cloth scraps to make it more flexible.'' (google)
Explanation:
I did a search on Google and I found this. Hopes it helps.
The hot, dry sand easily eliminated the dead bodies moisture and produced a natural mommy. The ancient Egyptians started to use a method called mummification to manufacture their mommies to ensure that the body was preserved. This involves the body being embalmed and then covered in thin linen strips.
