ASTM D3364 Flow Rates for Poly Vinyl Chloride Melt Flow Index Tester for PVC, MFR and MVR measurement on PVC;

ASTM D3364- Measurement of Flow Instability in PVC 

This method is an extension of ASTM D1238 used to measure the melt flow rate (MFR) value and instability of PVC compounds.

This testing method is used for quality control testing of PVC compounds with a wide range of melt viscosity. This test is specifically designed to measure the melt flow rate (MFR or MFI) of polyvinyl chloride compounds, while detecting and controlling various polymer instabilities related to flow rate. The sensitivity of this testing method makes it useful as an aid in correlating with processing conditions and predicting processing changes. This test is capable of detecting and tracking profound changes that occur during extrusion, injection molding, milling, or mixing processes due to three types of measured polymer instability, including thermal instability caused by temperature effects, shear instability caused by polymer chain breakage, and rheological instability caused by uneven distribution of viscosity or molecular weight elements.

Test a PVC sample at 175 ° C. Due to the corrosiveness of PVC material, the melt flow index tester need equip with a special corrosion-resistant kit to prevent any interaction between the material and metal during testing. 

Under standard configuration, measurements are taken at a temperature of 175 ° C and a load of 20kg. For rigid PVC, using a larger test load of approximately 50kg may be more advantageous. Semi hard or soft PVC is measured at 150 ° C/50kg.

The mold is 25.43mm (1 inch) long, with a diameter of 2.095mm compared to the standard mold, and has a conical feeding port. Compared to standard molds, this mold reduces MVR by approximately 10 times. The filling volume is 2.15 grams and must be strictly followed. The MFR value is calculated in milligrams per minute, and the instability of the molten material is expressed as a percentage. Through the testing method of ASTM D3364, it is possible to detect polymer bond breakage caused by temperature effects, shear, or instability caused by rheological effects (such as uneven distribution of viscosity or molecular weight).

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