Medical Laboratory Testing: Melt Flow
Melt Flow testing measures how easily a thermoplastic resin flows when melted under specific temperature and load conditions. The test extrudes the material through a standard die and reports the melt flow rate (grams per 10 minutes) or melt volume-flow rate. For medical manufacturers, consistent melt flow values are essential to ensure reliable processing, batch-to-batch uniformity, and proper performance in tubing, films, bags, syringes, connectors, and injection-molded components.
Melt flow rate serves as a practical indicator of molecular weight and processability. Too high or too low a value can lead to manufacturing defects, inconsistent wall thickness in tubing, or poor mold filling. Applus+ Reliable Analysis already maintains accredited melt flow testing capabilities using extrusion plastometers that operate daily alongside our polymer characterization and mechanical testing programs.
These measurements support material qualification and quality control under standards such as ISO 10993 and USP requirements. Manufacturers use melt flow data to verify supplier resins, monitor degradation during processing, and ensure the final device meets dimensional and performance specifications. Applus+ Reliable Analysis delivers precise, reproducible results using equipment already operating daily under our ISO/IEC 17025 accreditation.
Common Melt Flow Medical Testing Standards
ASTM D1238 for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
ASTM D1238 measures the melt flow rate of thermoplastics by extruding the material through a standard die under a specified load and temperature. The test reports the mass of material extruded in a given time (grams per 10 minutes) or the melt volume-flow rate. Medical manufacturers use this method to verify consistent molecular weight and processability of resins used in tubing, syringes, connectors, films, and injection-molded components, ensuring reliable manufacturing and material performance.
ISO 1133-1 Plastics Standard Method
ISO 1133-1 specifies the standard procedure for determining melt mass-flow rate and melt volume-flow rate of thermoplastics using an extrusion plastometer under defined conditions of temperature and load. The method provides comparable data across laboratories and material types. It is essential for medical-grade polymers used in tubing, packaging, bags, and molded devices, particularly for products seeking European MDR compliance where consistent flow characteristics are required for quality and regulatory acceptance.
USP <117> Molecular Weight Determination and Related Melt Flow Correlation
USP <117> addresses molecular weight determination of polymers, often correlated with melt flow rate measurements to assess material quality and consistency. The chapter supports the use of melt flow data as a practical indicator of polymer chain length and processability. It is widely applied to medical-grade plastics and packaging materials used in pharmaceutical-contact and sterile devices to ensure batch uniformity and compliance with pharmacopeial expectations.
ISO 1133-2 Plastics Method for Materials Sensitive to Time-Temperature History
ISO 1133-2 provides a specialized procedure for determining melt flow rate of thermoplastics that are sensitive to time and temperature history. The standard uses shorter preheat and test times to minimize degradation during measurement. It is particularly relevant for heat-sensitive medical polymers and degradable materials used in implants, drug-delivery systems, and resorbable components where accurate melt flow data is needed without altering the material during testing.
Medical Melt Flow Compliance and Certification Testing Experts
Applus+ Reliable Analysis stands ready to support your medical polymer melt flow rate and processability testing needs. Our ISO/IEC 17025 accredited laboratory already maintains the necessary extrusion plastometers and analytical capabilities, allowing us to efficiently add these medical standards with only minor validation and training.
Whether you are qualifying new tubing and films, validating injection-molded components, or ensuring consistency in medical-grade resins, our team provides accurate and reliable data backed by decades of materials testing expertise. We invite you to Contact us to discuss how our expanded medical testing capabilities can support your next project or regulatory submission.
Additional Applus+ Reliable Analysis’ Commercial Medical Testing Capabilities
Whether it be material EMC, environmental, fabrication, or durability testing, Applus+ Reliable Analysis has a full lab of test equipment, which permits us to provide short lead times on scheduling. Our team strives to give our customers more time and energy on product development rather than testing.
Below is a list of common medical testing types that Reliable Analysis offers. Don’t see what you are looking for? Contact us, and we will determine the best course of action.
