Fracture (of which effectively the property of crispness is as a result) itself represents a very difficult
characteristic to measure, due to the face that a fracture event never occurs identically a second time.
A convenient physical test is therefore to compress a population of multi-particulate products constrained
within a container such as the Ottawa Cell. In such a test, a multi-peak jagged curve is obtained resulting
from the fracture of a number of flakes/pieces, each peak corresponding to the rupture of a single
flake/piece. This is different from the situation where a single piece of sample is being compressed.
However, it offers an averaging effect tests of a more representative portion of the sample which is much
more repeatable. The multi peak curves obtained may then be analysed using special calculations
within Exponent software.