The melt flow index (MFI) is ameasure of the ease of flow of the melt of a thermoplastic polymer. It is defined as the weight of the polymer in grams flowing in 10 min through a die of specific diameter and length by a pressure applied by a given weight at a given temperature.
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What is melt flow index?
Explaining Melt Flow Index. Melt flow indexing is the most popular, and yet least accurate way to determine material viscosity. The melt flow index (MFI) is the measure of how many grams of polymer pass through a standardized capillary under a standard load over 10 minutes. The value obtained through the melt flow index test is a single data point.
What is the relationship between melt index and melt viscosity?
Boenig (1966) gives a similar correlation (for polyethylenes) between melt index and melt viscosity (at l90 C): The melt flow index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.
What is the melt flow index of LDPE polymer?
10.6.1 Melt flow index LDPE polymer (%) Pineapple leaf fibre (%) MFI (g/10 min) at 145 C 100 0 180 90 10 43.71 80 20 12.27 70 30 4.542
What is the melt flow rate of plastic?
One does not want a temperature so high that the polymers in the plastic decompose. The melt flow rate is an indirect measure of molecular weight, with high melt flow rate corresponding to low molecular weight. Synonyms of MFI are melt flow rate and melt index, which are commonly abbreviated: MFR and MI.