histogram mfi Multi - slicing can quickly highlight polymer behaviour, such as degradation and cross linking, which would have otherwise gone unnoticed if just the average test results had been taken. The histogram opposite clearly shows that the polymer is undergoing a rapid change in its structure causing its resistance to flow to dramatically increase towards the end of the travel distance/resident time in the cylinder. Multi-slicing is a standard feature on the 5MPC model. It also provides the shear rate and viscosity of the test material and because of these addition features, the National Physical Laboratory selected this apparatus for studies into multi- rate shear and extensional flow properties of polymer materials.