Use MFR Cautiously with Filled Materials.

The article focuses on the use of melt flow rate (MFR) testing in filled materials such as glass-fiber reinforced with polybutylene terephthalate (PBT) polyester. It mentions the importance of considering the relationship of molecular weight and MFR in most of polymers. It states that fillers contribute to MFR increases in the compound in which the filler is added. It says that incase MFR tests are used instead of using intrinsic viscosity (IV), the effect of the fillers should be considered.