Overview
IEC 60684-3-246:2007 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for flexible insulating sleeving, specifically dual wall, non-flame retarded, heat-shrinkable polyolefin sleeving. This type of sleeving is designed for electrical insulation and protective applications and is suitable for continuous use at temperatures up to 110 °C.
The sleeving consists of two distinct layers:
- An outer layer made from a semi-rigid, cross-linked polyolefin material, providing mechanical strength and insulation.
- An inner layer of substantially non-cross-linked polyolefin that flows and fuses during heat-shrinkage to form a seal, ensuring environmental protection.
This standard aligns its requirements closely with recognized national specifications to facilitate international uniformity in manufacturing and application.
Key Topics
IEC 60684-3-246:2007 covers several essential aspects of dual wall heat-shrinkable polyolefin sleeving:
- Product requirements: Maximum internal diameter up to 25 mm, available in standard colors like black, white, red, yellow, blue, and translucent. Custom sizes and colors are permitted if they meet property requirements.
- Performance criteria: Emphasizes key properties such as:
- Dimensional accuracy after recovery
- Heat shock resistance
- Longitudinal change limits
- Brittleness at low temperatures
- Tensile strength and elongation
- Electric breakdown voltage
- Resistance to selected fluids (oils, fuels, deicing fluids)
- Sealing performance, especially where the inner layer fuses to prevent ingress
- Test conditions: Requires testing in a forced air oven and specifies methods for evaluating sealing, mechanical, and electrical properties.
- Marking and designation: Provides a clear system for product identification, including size, color, and relevant IEC sheet numbers.
Applications
Heat-shrinkable dual wall polyolefin sleeving compliant with IEC 60684-3-246:2007 is widely used in:
- Electrical insulation: Enclosing and insulating wires, joints, terminals, and other conductive elements to prevent short circuits and accidental contact.
- Environmental sealing: Providing a protective barrier against moisture, dust, chemicals, and other environmental hazards in electrical installations.
- Mechanical protection: Adding a layer of abrasion and impact resistance to delicate cable connections and splices.
- Automotive and aerospace sectors: Protecting wire harnesses and connector backshells where high resistance to fluids and temperature variations are essential.
- General electronics and appliance manufacturing: Ensuring reliable light- to medium-duty insulation for assemblies that do not require flame-retarded materials.
Related Standards
For a comprehensive approach to insulating sleeving, the following related IEC and ISO standards offer additional definitions, methods, and categories:
- IEC 60684-1: Flexible insulating sleeving – Part 1: Definitions and general requirements
- IEC 60684-2: Flexible insulating sleeving – Part 2: Methods of test
- IEC 60757: Code for designation of colours
- ISO 1817: Rubber, vulcanized – Determination of the effect of liquids
Staying up-to-date with these standards helps manufacturers, specifiers, and users ensure that products meet recognized international benchmarks for safety, performance, and compatibility.
Keywords: IEC 60684-3-246, heat-shrinkable sleeving, dual wall sleeving, polyolefin insulating sleeving, non-flame retarded, electrical insulation, cable protection, international standard, environmental sealing, mechanical protection.
Open preview (PDF)Flexible insulating sleeving - Part 3: Specifications for individual types of sleeving - Sheet 246: Heat-shrinkable polyolefin sleeving, dual wall, non-flame retarded
