Overview
IEC TR 60216-7-2:2024 is a technical report from the International Electrotechnical Commission (IEC) focused on electrical insulating materials and their thermal endurance properties. This document presents the results of round robin tests conducted to validate the procedures described in IEC TS 60216-7-1. The validation is carried out through non-isothermal kinetic analysis using thermogravimetric data, providing an accelerated determination of relative thermal endurance (RTEA) for electrical insulating materials. The second edition of this report supersedes the 2016 edition and incorporates technical updates for enhanced clarity and broader applicability.
IEC TR 60216-7-2 is especially relevant for professionals working with polymeric insulation materials in the electrical and electronics industries, providing insights into advanced thermal analysis methodologies and the consistency of results across multiple laboratories.
Key Topics
-
Objective and Scope
- Validation of IEC TS 60216-7-1 by comparing analytical test methods with conventional approaches from the IEC 60216 series.
- Focus on preliminary interlaboratory studies, evaluating test procedures, apparatus influence, and data variance.
-
Round Robin Test Approach
- Use of thermogravimetric analysis (TGA) performed at multiple heating rates to assess thermal degradation behavior.
- Involvement of multiple laboratories and materials, primarily polyesters reinforced with glass fibers.
- Evaluation using both Method A (degree of conversion from reference material) and Method B (fixed degree of conversion).
-
Technical Changes in Second Edition
- Addition of Annex A with new round robin data using polybuthylene terephthalate (PBY), demonstrating the versatility of the method.
- Correction of data tables to include units and technical clarifications, improving reproducibility and understanding of analytical procedures.
-
Terminology and Measurement Principles
- RTE (Relative Temperature Endurance Index) and TI (Temperature Index) as key indicators of thermal endurance.
- Activation energy as an essential parameter in assessing degradation behavior.
- Considerations for sample preparation, apparatus calibration, and treatment of laboratory variance.
Applications
IEC TR 60216-7-2 provides practical value for:
-
Electrical Equipment Manufacturers
- Enables accelerated assessment of the thermal lifespan of insulating materials.
- Supports design and certification of components exposed to high thermal stress.
-
Testing Laboratories
- Offers validated methodologies for quantifying thermal endurance properties using TGA and analytical calculations.
- Facilitates interlaboratory comparisons and aids in standardizing test procedures.
-
Quality Assurance and Material Development
- Helps material scientists and engineers evaluate new polymeric insulations or reformulated materials against known standards.
- Offers a foundation for establishing benchmarks and ensuring consistency in insulation performance.
-
Standardization and Regulatory Compliance
- Assists in meeting global requirements for the testing and approval of electrical insulating materials.
Related Standards
- IEC TS 60216-7-1: Specifies the methods for accelerated determination of thermal endurance using analytical test methods.
- IEC 60216 Series: Covers the general evaluation of thermal endurance properties for electrical insulating materials.
- ISO 11358-2: Provides procedures for thermogravimetric analysis of polymers.
- IEC 60216-5: Details procedures for conventional thermal ageing tests of insulating materials.
Conclusion
IEC TR 60216-7-2:2024 is a crucial resource for industry stakeholders aiming to implement modern, efficient, and internationally validated methods for evaluating the thermal endurance of electrical insulating materials. By presenting interlaboratory findings and clarifying analytical procedures, this technical report drives the adoption of accelerated, reliable testing protocols, ultimately supporting robust product development and regulatory compliance in electrical insulation systems.
Keywords: IEC TR 60216-7-2:2024, electrical insulating materials, thermal endurance, thermogravimetric analysis, round robin test, IEC TS 60216-7-1, temperature index, accelerated test methods, polymer insulation, international standards.