The melt flow test is described in standards ISO 1133-1 and ASTM D1238 (general test method), ISO 1133-2 (method for materials sensitive to time-temperature history and or/moisture, e.g. PBT, PET or PA), as well as ASTM D3364 (test method for PVC). ISO and ASTM describe the test methods (method A – MFR, method B – MVR, method C "half …