Question: what is the difference between melt flow rate and melt index?
Answer: Synonyms of Melt Flow Index are Melt Flow Rate and Melt Index. More commonly used are their abbreviations: MFI, MFR and MI. Confusingly, MFR may also indicate "melt flow ratio", the ratio between two melt flow rates at different gravimetric weights. ... MFI is often used to determine how a polymer will process.