How Moisture Will Influence the PET in Melt Flow Index Testing?

Reviewed by Anurag Mishra (Sr. Technical Consultant)

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PET products are widely used in different industries to store several items effectively. But do you know that these products will easily get affected by moisture content during processing and even more testing? Thus, you need to make sure that your PET product would not get influenced by moisture by effectively testing its melt flow rate.

In the plastic industry, it is very important to measure the viscosity and melt flow rate so as to improve their product quality. These physical properties of the thermostatic plastics can easily be analyzed with the help of a melt flow index tester. This lab testing instruments is easy to use and provides you with the right assistance to the flow of melt flow properties of materials so as to prevent any damage. A higher melt flow rate means that your product will have less waste in any molds while running an extruder. Here in this blog, we are going to provide you with information about how your PET products get influenced by moisture while performing melt flow index testing. But, before that, let’s discuss the significance of melt flow index tester in PET products.

Significance of melt flow index tester in PET industry

MFR or melt flow rate is considered to be the major criteria in testing the melt flow index of materials. The melt flow index tester will help you to easily analyze the physical as well as chemical properties of materials and make sure that the best quality products will be delivered. This lab testing equipment will prominently detect the flow properties of plastics. Thus, you can easily analyze the product quality with the help of a melt flow index tester. Testronix melt flow index tester consists of a microprocessor-based PID temperature controller that ranges from 0 degrees to 400 degrees Celsius. It has very high precision with a resolution of 0.1 degrees Celsius. This testing equipment adheres to all industry standards (ASTM D 1238, IS 2267, IS-2530, IS 10810). 

Features of Testronix melt flow index tester

This MFI tester from Testronix has been embedded with several sets of features that will help you analyze the various properties of plastics with ease. This will certainly help you in improving the quality of the product. Read the list of these features below.

  • High heating capacity from ambient to 400 degrees C.
  • Pre-settable digital timer for selecting the test cycle time for sample cutting.
  • Advanced PID controller for effective temperature control.
  • Auto tuning function provided with PID controller.
  • Stainless steel inner body with corrosion resistance.
  • Provided with automatic and manual operation for cutting of the test specimen.

With these features, you can analyze melt flow index tester for granules. To know about its technical specifications, you can click the technical specifications below.

Technical Specifications of Testronix melt flow index tester

  • A digital LED Display and a temperature range of Ambient to 400°C will be provided.
  • The working range of this testing machine will be Ambient to 260 degrees C.
  • Heating Barrel Material will be made of die steel.
  • The inner diameter of the cylinder will be 9.500 mm ± 0.005 mm while the length of the cylinder will be 115 mm ± 0.005 mm.
  • Cutting device Motor speed will be 60 R.P.M.
  • Electrical supply of 15 amps. 220 V ± 15%. Single-phase AC will be provided.
  • Power consumption will be 1 KW.

With these features and technical specifications, you can easily determine the melt flow index of plastics. If you wish to use this melt flow index tester for thermoplastics for a longer time, then you should maintain it properly. Besides the manual model, you can also use the motorized sample cutting model of this lab testing equipment.

Now, let us discuss the effect of moisture on the melt flow index of plastic materials.

Effect of moisture on melt flow index of plastic materials

It is true that the melt flow index of the material will depend on different factors such as molecular structure, chemical bonding within molecules, and many others. When the moisture will get absorbed then it will act as a plasticizer that reduces the glass transition temperature and strength of plastics. However, this absorbed water will lead you irreversible degradation of polymer structure. With the presence of moisture, there can be a lot of variation in the melt flow index of the plastics.

Thus, you can conduct this quality test and determine all melt flow properties of materials such as impact resistance. The material with a higher MFI will be easier to process, but it may lower the other properties of the material such as impact resistance due to the lower molecular weight of the material. When the MFI of incoming material is conducted in the industries, it indicates if there is any degradation in the quality of the product during the transportation process. The melt flow index test of the material also helps the manufacturers of plastic resins to introduce necessary changes in the manufacturing process to ensure the best quality of the material.

You can easily buy this lab testing instruments from us as we are considered to be the best Melt flow index tester manufacturers in Delhi NCR. If you want to know about melt flow index tester price then give us a call a +91 9313140140 or email us at Our technical experts will easily guide you well regarding your queries.

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