1) Encrustation 2) Encrusting 3) Forming a crust 4) Making a crust 
[chemical engineering] Caking refers to a powder`s tendency to form semi-solid lumps or masses rather than flow smoothly like dry sand. Factors involved in the degree of caking include the substance`s particle surface chemistry, particle size and particle-size distribution, particle shape, and environmental factors such as temperature, humi...
• (p. pr. & vb. n.) of Cake