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Melt Flow Index - Plastics World

MASTERBATCHESMelt Flow IndexMelt Flow IndexOne of the properties most often quoted for both natural polymersand masterbatches is melt Flow Index (MFI).What is MFI and why is it significant ? melt Flow Index is the output rate (flow) in grammes that occurs in 10 minutes through a standard die of mm diameterand in length when a fixed pressure is applied tothe melt via a piston and a load of total mass of kg at a temperature of 190 C (some polymers are measured at a highertemperature, some use different weights and some even differentorifice sizes).

or twin screw extruder, it is possible to choose a fairly low MFI carrier resin and still achieve excellent incorporation. Polymer producers generally follow this practice when making pipe or cable compounds in order not to affect the final performance properties of the compound. If poor distribution occurs when simultaneously feeding masterbatch

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