BS ISO 20965:2021 - Plastics. Determination of the Transient Extensional Viscosity of Polymer Melts

Standard Number: BS ISO 20965:2021

Pages: 26

Released: 2021-05-05

ISBN: 978 0 539 12200 8

Status: Standard

Overview

The BS ISO 20965:2021 is a crucial standard for professionals in the field of polymer science and engineering. This document provides a comprehensive methodology for determining the transient extensional viscosity of polymer melts, a key property that influences the processing and performance of plastic materials. Understanding this property is essential for optimizing manufacturing processes and ensuring the quality of the final product.

Why is Transient Extensional Viscosity Important?

Transient extensional viscosity is a measure of a polymer melt's resistance to deformation under extensional flow, which is a common condition in many polymer processing operations such as film blowing, fiber spinning, and blow molding. This property is critical for predicting how a polymer will behave during processing and can significantly impact the mechanical properties and appearance of the final product.

Key Features of BS ISO 20965:2021

• Comprehensive Methodology: The standard provides detailed procedures for measuring the transient extensional viscosity of polymer melts, ensuring accurate and reproducible results.
• Industry Relevance: Applicable to a wide range of polymer types, making it a versatile tool for researchers and manufacturers in the plastics industry.
• Quality Assurance: By adhering to this standard, companies can enhance their quality control processes, leading to improved product performance and customer satisfaction.

Who Should Use This Standard?

This standard is indispensable for:

• Polymer Scientists and Engineers: Professionals involved in the research and development of new polymer materials and processing techniques.
• Quality Control Specialists: Individuals responsible for ensuring the consistency and quality of polymer products.
• Manufacturers: Companies involved in the production of plastic materials and products, seeking to optimize their processes and product quality.

Benefits of Implementing BS ISO 20965:2021

Implementing the guidelines and procedures outlined in BS ISO 20965:2021 offers numerous benefits, including:

• Enhanced Product Quality: By understanding and controlling the extensional viscosity of polymer melts, manufacturers can produce higher quality products with improved mechanical properties and surface finish.
• Process Optimization: Accurate measurement of extensional viscosity allows for better control of processing conditions, leading to more efficient and cost-effective manufacturing operations.
• Competitive Advantage: Companies that adhere to international standards like BS ISO 20965:2021 demonstrate their commitment to quality and innovation, enhancing their reputation in the marketplace.

Conclusion

The BS ISO 20965:2021 standard is an essential resource for anyone involved in the production and research of polymer materials. By providing a reliable method for determining the transient extensional viscosity of polymer melts, this standard helps ensure the quality and performance of plastic products. Whether you are a scientist, engineer, or manufacturer, implementing this standard can lead to significant improvements in your processes and products.

For those looking to stay at the forefront of polymer technology and maintain high standards of quality, the BS ISO 20965:2021 is an invaluable tool that supports innovation and excellence in the plastics industry.

BS ISO 20965:2021

This standard BS ISO 20965:2021 Plastics. Determination of the transient extensional viscosity of polymer melts is classified in these ICS categories:

• 83.080.01 Plastics in general

This document specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.

The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s^–1 to 1 s^–1, at Hencky strains up to approximately 4 and at temperatures up to approximately 250 °C (see NOTEs 1 and 2). It is suitable for measuring transient extensional viscosity values typically in the range from approximately 10⁴ Pa?s to 10⁷ Pa?s (see NOTE 3).