IEC 60667-3-1:2020

Overview

IEC 60667-3-1:2020 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the requirements for vulcanized fibre flat sheets used for electrical purposes. This standard is part of the broader IEC 60667 series, which addresses vulcanized fibre for various electrical applications. The standard is applicable to sheets of vulcanized fibre and does not cover materials formed by bonding multiple layers with adhesives. It defines established performance levels for these materials, but the final selection should always consider specific application requirements.

This second edition, published in 2020, supersedes the previous 1986 edition and introduces technical changes such as revised thickness deviations, inclusion of apparent density, updated tensile strength ranges, flexibility and shrinkage parameters, and modified testing methods for internal ply adhesion.

Key Topics

• Scope and Applicability: Focuses on flat sheets of vulcanized fibre for electrical applications, excluding composite sheets formed with adhesives.
• Classification: The material is categorized as either general type or fishpaper type, as referenced in IEC 60667-1.
• Requirements: Sheets must meet general quality and finish criteria, as well as established mechanical and electrical properties when tested per IEC 60667-2.
• Performance Characteristics: The specification outlines base performance attributes, but application-specific factors should guide material selection.
• Revised Technical Criteria:
  • Adjusted range for thickness deviations.
  • Addition of apparent density requirements.
  • Updates to tensile strength categories based on thickness.
  • Introduction of flexibility and shrinkage measurements.
  • Revised methods and values for internal ply adhesion testing.

Safety Warning: Users are responsible for applying the test methods from this standard in a safe manner and ensuring compliance with local safety regulations.

Applications

Vulcanized fibre sheets compliant with IEC 60667-3-1:2020 play a pivotal role in electrical and electronic industries, where reliable insulating materials are essential for safety and performance.

Typical applications include:

• Electrical insulation: Used as slot liners, phase barriers, and separators in motors, generators, and transformers.
• Control panels and switchgear: Employed as mounting panels and supports due to their insulating properties.
• Component fabrication: Cut and shaped for washers, gaskets, and other insulating parts in electrical assemblies.
• Consumer and industrial equipment: Utilized in devices requiring durable, thin insulation with consistent dielectric and mechanical properties.

When selecting vulcanized fibre sheets for an application, it is important to consider environmental exposure, mechanical demands, and specific electrical requirements to ensure compliance beyond just the standard’s baseline.

Related Standards

IEC 60667-3-1:2020 is part of a series dedicated to vulcanized fibre for electrical purposes. For comprehensive compliance and optimal material selection, users should be familiar with the following related IEC standards:

• IEC 60667-1: Vulcanized fibre for electrical purposes - Definitions and general requirements.
• IEC 60667-2: Vulcanized fibre for electrical purposes - Methods of test.
• Other Parts of IEC 60667: Specifications for additional forms, grades, and uses of vulcanized fibre.

These related documents clarify terms, testing procedures, and broader requirements essential for full alignment with international best practices in electrical insulation.

By adhering to IEC 60667-3-1:2020, manufacturers, engineers, and users assure material quality and performance for vulcanized fibre flat sheets in electrical applications, supporting safety, reliability, and global standardization in the electrotechnical field.