Determination of MFR or MVR values is used for easy Goods Inwards quality control of raw materials and is specified in ISO 4440.
 
This simple method is particularly useful for early identification of variations in molecular distribution in polyolefins.

This simplifies production process optimization as there is less disruption due to material  variations.

By skilful mixing of batches with different melt flow rates it is possible to achieve largely uniform raw material.