Importance of Melt Flow Index in Polymer Processing

Importance of Melt Flow Index in Polymer Processing

Melt flow rate is an essential property of thermoplastics that will help you to determine the rate at which polymer will flow at a melting point under the applicable standard weight. Thus, MFI is considered to be the important parameter as it provides you with necessary data on the mass flow rate of the polymer. Since polymers are made up of varying lengths then you can easily determine the flow characteristics of these materials with the help of a melt flow index testerPresto is a leading melt flow index tester manufacturer in Delhi NCR and offers you the best price to evaluate the melt flow of different materials.

The MFR model (Method- A & B) is one of the effective models that can quickly extrude the flow rate of molten resins and utilize the advanced setup of load, piston, and a metallic barrel. The specimen will majorly be in a granule form and is put inside the barrel and the piston is inserted. Here in this article, we are going to discuss the importance of melt flow index tester for granules & how it is helpful in testing the melt flow index of thermoplastics.

How can you easily ensure the quality of plastics with a melt flow index tester?

Presto melt flow index tester is an apt device that will help you to conduct the melt flow test and evaluate the different properties of materials like resins, molten plastics that will be allowed to flow in the molds. MFI or melt flow index of plastics is a crucial property that will help you assess the rate of flow of materials through which molten plastics will be allowed to flow in molds. This lab testing instrument will play an essential role in determining the quality of plastics or polymers used in different types of industries. With the help of a melt flow test, you can calculate the flow rate of plastics with ease.

Once the manufacturer will test the flow rate of plastics, then they can use standard and used to grade them in several materials. This test will also allow the manufacturers to determine the exact time, extrusion response time, or behavior, and the temperature at which polymer will get melted. Below we have listed the features and technical specifications of the MFI tester MFR Model (Method - A & B).

Features of Melt flow index tester (Method- A & B)

The length of the molecular chain influences the flow properties of polymers. Controlling the precise chain length during polymerization is very challenging, the resulting mix or distribution of chain lengths (long and short), also known as the molecular weight distribution, has an impact on the flow characteristics. Thus, it is important to test the melt flow rate (MFR) value for a material is a single point on a curve that characterizes viscosity as a function of shear rate. Below we have listed the features you will get with the Presto melt flow index tester.

  • Incorporates the Latest touch screen facility.
  • Designed to calculate the melt flow index automatically.
  • Offers a wide temperature range from ambient to 400°C.
  • Easy changeability of weights is possible.
  • The auto-cutting facility was provided.
  • PID temperature controller ensures accuracy.
  • Preset timer provided.
  • Inbuilt calculator for calculating MFI /MFR values.

With these features, you can assess the melt flow index of different plastics. Now, let us discuss its technical specifications.

Technical Specifications of melt flow index tester (Method- A & B)

  • Sample cutting: Manual & Automatic
  • Temperature Range: Ambient to 4000 C.
  • Heating Barrel Material: Die Steel
  • Inner Diameter of Cylinder: 9.500 mm ± 0.005 mm.
  • Length of Cylinder: 115 mm ± 0.005 mm
  • Inner Diameter of Die: 2.090 mm ± 0.005 mm
  • Dimensions of piston head: 9.47 mm diameter x 6.35 mm ± 0.10 mm in length
  • Dead Weights: 1.2 kg, 2.16 kg, 3.8 kg, 5 kg, 10 Kg, 12.5 Kg and 21.6kg.
  • Outer Body Material: Mild Steel Duly Powder Coated
  • Least Count: 0.10 C
  • Repeatability: ±2.00 C
  • Temperature Control: PID temperature controller
  • Heating Control: SSR relay-25 Amp
  • Timing device: Digital preset timer with a range of up to 59 minutes and 59 seconds.
  • Timer Least Count: 0.1 second
  • Heater Wattage: 600 watt
  • Accuracy: ±2.00 C
  • Cutting device Motor speed: 60 R.P.M.
  • Heat Sensor: PT-100
  • Electrical supply: 15 Amp, 220 V, Single phase AC, 50 Hertz
  • Display: HMI Multi-Color Touch Screen

These are the technical specifications you will get with the use of this amazing lab testing instrument. You can effectively take an account of the flowing properties of the polymers. Once you determine the flowability of polymers then you can deliver accurate products to your customers. You can also read about the importance of melt flow index measurements in the plastic and polymer industry.


The melt flow index testing process is a simple and straight process to measure the flow of a polymer when melted. The melt mass-flow rate (MFR) or melt volume-flow rate (MVR) is the amount of mass or volume of a polymer that flows through a tiny die at a specific temperature and pressure as a result of a melt flow test. Presto melt flow index tester will be designed to automatically calculate the melt flow index of the test sample at a given temperature. The Presto Melt Flow Index Tester has a PID temperature controller for accuracy and reproducibility. Method A & B of ASTM D 1238 and ISO 1133 standards can be conducted on the machine to calculate MFI & MFR. If you want to know more about the melt flow index tester price, working or other related information, give us a call at +91 9210903903 or email us at Our technical experts will easily assess you through your queries.

Recent News

blog img

Catalogue 2023

Get information about new product launches, research, innovation and endeavors at Presto.

download Free Copy

Need more information

Connect with us for your business enquiries. Generally we respond within one or two working days.

send enquiries

Contact Us

Get a Quote