Overview
IEC 60819-3-3:2011 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies requirements for unfilled aramid (aromatic polyamide) papers used in electrical applications. This document is part of the broader IEC 60819 series which covers non-cellulosic insulating papers for electrical purposes, focusing specifically here on four types of unfilled aramid paper:
- Type 1: Calendered paper
- Type 2: Calendered paper with enhanced tearing resistance and conformability
- Type 3: Uncalendered paper
- Type 4: Calendered paper with lower density, intended for laminating
These materials comply with rigorous standards and are intended to offer reliable electrical insulation performance, but their selection for specific uses should be based on the requirements of each application.
Key Topics
- Material Types: The standard defines and distinguishes between four types of unfilled aramid insulating papers, identifying their structural and performance differences.
- Properties and Requirements: The document outlines physical and electrical requirements such as thickness, grammage, density, tensile strength, elongation at break, edge tearing resistance, dielectric strength, and shrinkage on heating.
- Testing Methods: Requirements are determined using test methods specific to non-cellulosic papers as described in IEC 60819-2. This marks a shift from previous editions, aligning more directly with methods tailored to the unique characteristics of non-cellulosic materials like aramid.
- Technical Updates: This edition introduces new, very thin grades of type 4 paper designed for advanced laminating processes and updates the normative references.
Applications
Unfilled aramid paper, as specified in IEC 60819-3-3, is highly valued in the electrical industry for its outstanding electrical insulation properties and mechanical strength. Key applications include:
- Insulation in Electrical Equipment: Utilized as insulating barriers or wraps in transformers, electric motors, and generators, where mechanical durability and high dielectric strength are essential.
- Laminates: Type 4 is specially suited for laminating processes because of its lower density and very thin grades, supporting composite insulation systems.
- Flexible Insulation: Type 2, with improved conformability and tearing resistance, is ideal for applications requiring the paper to conform to complex shapes or endure mechanical stress.
The guidance and limits in the standard help manufacturers and engineers ensure that their chosen aramid paper meets the necessary performance criteria for demanding electrical applications, boosting equipment efficiency, safety, and longevity.
Related Standards
For comprehensive application and verification, IEC 60819-3-3 should be used in conjunction with other parts of the IEC 60819 series and related documents, including:
- IEC 60819-1: Definitions and general requirements for non-cellulosic papers used for electrical insulation
- IEC 60819-2: Methods of test for non-cellulosic papers
- ISO 186: Paper and board - Sampling to determine average quality
Other related standards include IEC 60554 series, which focuses on cellulosic papers for electrical purposes-useful for comparative insights and applications involving hybrid insulation systems.
By following IEC 60819-3-3, manufacturers, engineers, and product specifiers ensure the electrical papers they select or supply meet globally recognized quality and performance benchmarks for safe and reliable operation in electrical equipment. This fosters international compatibility, safety, and efficiency for critical insulation applications.
Open preview (PDF)Non-cellulosic papers for electrical purposes - Part 3: Specifications for individual materials - Sheet 3: Unfilled aramid (aromatic polyamide) papers
