Melt Flow Index

The Melt Flow Index (MFI) tester is a highly specialized device designed to measure the flow properties of plastic materials. As one of the most critical parameters in polymer characterization, MFI directly indicates the processability of plastics in manufacturing techniques such as injection molding, extrusion, film production, and pipe manufacturing. With advanced touchscreen technology, modern instruments allow the user to input melt weight values and automatically calculate results with high precision. This ensures accurate quality control, compliance with international standards, and seamless certification for global trade.

Main Purpose of the Device

The primary function of the Melt Flow Index Tester is to determine how plastics behave under specific temperature and load conditions. By evaluating the flow rate, manufacturers can identify which material is best suited for different production techniques and ensure consistent quality in mass production.

What is the Melt Flow Index (MFI) Test?

The MFI test measures the amount of polymer melt that flows through a capillary die in a given time under standard conditions. The result expresses the ease with which a polymer can flow. A higher MFI indicates easier flow and lower viscosity, while a lower MFI suggests a denser material with reduced flow capability.

Importance and Purpose of the Test

  • Ensures reliable raw material selection.

  • Guarantees consistency and quality in production.

  • Strongly correlates with the mechanical performance of the final product.

  • Plays a key role in export certifications and compliance with international quality requirements.

Scientific Basis of the Test

The MFI measurement is based on the viscosity of thermoplastics. Viscosity depends on molecular weight, temperature, and additives within the polymer. The device applies a constant load and measures the extrudate mass or volume, providing a scientific and standardized value for material comparison.

Device Usage

  • Test parameters are entered via the touchscreen.

  • The desired melt weight is set, and the device performs automatic calculations.

  • The polymer sample is subjected to heating and load application.

  • The extruded amount is measured, displayed on the screen, and stored for analysis.

Technical Insights

  • Touchscreen interface: Provides fast and simple parameter entry.

  • Automatic calculations: Eliminates human error and saves time.

  • High-precision sensors: Guarantee reliable results across different polymers.

Advantages

  • Delivers quick and accurate test results.

  • Fully compliant with international standards.

  • Easy operation with automated calculation functions.

  • Suitable for a wide range of thermoplastic materials.

Technical Advantages

  • User-friendly digital control with color touchscreen.

  • High accuracy due to sensitive measurement sensors.

  • Automatic data processing and result storage.

Contribution to Quality Control

The device ensures that every batch of polymer material meets the same quality specifications. By enabling manufacturers to maintain consistent production, it reduces the risk of defective goods and supports long-term reliability in industrial applications.

Support for Export and Certification

MFI testing is a key requirement for many international certifications. By providing reliable test results, the device supports global trade, enabling manufacturers to comply with foreign quality standards and strengthen their competitiveness in export markets.

Application Areas (with Importance)

  • Packaging industry: Flow behavior is crucial for film and bag production.

  • Pipe manufacturing: Guarantees durability and long service life of pipes.

  • Cable industry: Ensures insulation materials meet safety and performance standards.

  • Automotive & household appliances: Assures proper flow properties for mechanical strength and processability.

Relevant Standards

  • TS EN ISO 1133: Specifies methods for measuring the melt flow rate of plastics.

  • DIN 53735: German standard for determining the melt flow properties of thermoplastics.

  • ASTM D1238: International standard for measuring the melt flow rate of thermoplastics.

  • ASTM D3364: Defines test methods for polyolefin melt flow characteristics.

  • TS 11451: Standard for measuring the flow properties of polypropylene materials.

  • TS 418 EN 12201: Applies to polyethylene materials used in plastic piping systems.

  • TS EN ISO 15874: Specifies polypropylene piping system testing standards.

  • TS EN 253: Defines requirements for polyethylene outer casing of pre-insulated pipes.