DIN 53735 is a German standard that outlines how to measure the melt flow rate of thermoplastics using an extrusion plastometer. It specifies test conditions, sample preparation, and result reporting to ensure accurate, consistent evaluation of polymer flow behavior for quality control and material comparison.
Overview of DIN 53735
DIN 53735 is a German standard that specifies the methodology for determining the melt flow rate (MFR) of thermoplastic materials. The standard details how to perform melt flow measurements using an extrusion plastometer, where material is pushed through a defined die under set temperature and load conditions. The MFR data directly indicates a polymer’s flowability, which is a critical property for evaluating the ease of processing thermoplastic materials in various manufacturing scenarios. The procedure defined in DIN 53735 covers several key aspects to ensure data is consistent and comparable across laboratories and production lines.
Melt flow measurement principle
Under DIN 53735, the core of the measurement relies on how much molten polymer is extruded through a capillary die in a set period, reflecting its viscosity and processing behavior. The applied conditions aim to mimic those found in industrial molding and extrusion operations. The result, expressed in grams per ten minutes, provides a quick and practical index for comparing different types, grades, or batches of thermoplastics within quality assurance and R&D programs.
Standard applications
Manufacturers in sectors such as automotive, packaging, and electronics frequently use DIN 53735 to verify the consistency of incoming raw materials and finished product batches. The results support decisions about material selection and processing parameters, helping optimize efficiency and maintain product quality across diverse applications.
Takeaway
DIN 53735 is a foundational standard for evaluating thermoplastic melt flow characteristics, offering a reproducible and precise approach for both laboratory and industrial quality control.
Preparing for the melt flow test
Testing according to DIN 53735 begins with ensuring that the test equipment and materials are properly prepared. Start by calibrating the extrusion plastometer and confirming that the test die is clean and meets required dimensions. Select a sample of the thermoplastic material and condition it as outlined in the standard, ensuring it is free from contaminants and moisture. This careful preparation helps avoid inaccurate results and reflects the standard’s emphasis on reproducibility.
Setting test conditions
Choose the prescribed test temperature and load relevant to the material type, as defined in DIN 53735. Heat the test barrel to this set temperature and allow time for stabilization. Accurately weigh the required amount of sample, then charge it into the barrel. Apply the load using a piston, making sure to match the parameters specified for that material and application.
Conducting the extrusion and measurement
Once the sample reaches the set temperature, initiate extrusion by allowing the piston to force the material through the die. Collect the extruded material over a defined period, typically ten minutes. Carefully trim and weigh the extrudate. Repeat as needed to confirm consistent data, following the repeatability guidelines in the standard.
Evaluating and reporting results
Calculate the melt flow rate as the mass of extrudate collected per ten minutes. Compare results with any applicable reference values or batch criteria. Record all test conditions alongside the final measurement to enable traceability and easy comparison with other batches or historical data.
Review, troubleshooting, and documentation
After testing, review all equipment, sample, and procedure notes to ensure the test ran within standard tolerances. If results fall outside expected limits, re-examine sample conditioning, temperature stability, and device calibration. Complete data documentation according to DIN 53735 requirements to support traceability for future reference or audits.
Summary
DIN 53735 establishes a clear, reproducible method for assessing thermoplastic melt flow properties, guiding users through a structured process of preparation, testing, and evaluation to support reliable quality control and material selection.
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