What is a melt flow index tester and how is it used in the plastics industry?

A melt flow index tester is a device used to measure the flow rate of melted plastic materials. This measurement is crucial in the plastics industry for assessing the viscosity and flow characteristics of various polymer resins under specific conditions. The test involves heating a plastic sample until it melts and then forcing it through a standardized die under controlled conditions. The rate at which the material flows through the die, known as the melt flow index (MFI), provides valuable information about the material's processability and performance.

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