SIST EN 4529-003:2009

Overview

SIST EN 4529-003:2009 is a European standard that defines the product requirements for Class T sealing plugs used in aerospace electrical and optical connection elements. Developed by the European Association of Aerospace Manufacturers (AECMA-STAN) and ratified by the European Committee for Standardization (CEN), this standard complements EN 4529-001 and EN 4529-002, ensuring consistent quality and performance of sealing plugs in high-reliability aerospace applications. The Class T sealing plugs specified are designed to operate within a temperature range from –65 °C to 260 °C, making them suitable for demanding aerospace environments.

Key Topics

• Scope and Use
  EN 4529-003 specifies the required characteristics of Class T sealing plugs intended for elements containing cable or wire sealing grommets, following EN 4529-002 guidelines. It is mandatory to use this standard alongside EN 4529-001 for a comprehensive technical specification.

• Material Specifications
  The sealing plugs must be made from polytetrafluoroethylene (PTFE), compliant with ISO 13000-2 Type E or an equivalent material. PTFE ensures high resistance to heat and chemicals, critical for aerospace applications.

• Dimensions and Models
  The standard defines detailed dimensions, mass, and color coding for plugs across various sizes, with specific measurements for Model N (normal) and Model L (long). This ensures compatibility with connectors and consistent installation.

• Operating Temperature Range
  Class T plugs are qualified to withstand extreme operating temperatures between –65 °C and 260 °C without degradation, ensuring reliable sealing performance in harsh aerospace environments.

• Testing Requirements
  EN 4529-003 includes a precise testing regimen consistent with aerospace quality standards, including visual examination, insulation resistance, endurance at extreme temperatures, rapid temperature changes, fluid resistance, flammability, and hydrolytic stability. Some tests can be omitted when using PTFE per ISO 13000-2 type E.

• Designation and Marking
  The standard outlines a clear system for identification and designation of sealing plugs, including size codes and model types. Although specific marking on plugs is not required under EN 4529-003, proper documentation and traceability are emphasized.

Applications

EN 4529-003 sealing plugs are widely used in aerospace electrical and optical connectors where environmental sealing and protection against contamination are critical. Typical applications include:

• Aircraft wiring harnesses requiring reliable cable sealing to prevent ingress of fluids or particulates.
• Optical fiber connections demanding contamination-free seal integrity.
• Aerospace systems operating under extreme temperature conditions where conventional sealing materials would fail.
• High-reliability defense and space vehicles needing standardized sealing components to ensure consistent performance and maintainability.

Using EN 4529-003 compliant sealing plugs enhances system reliability by providing effective sealing solutions that meet rigorous aerospace environmental and mechanical requirements.

Related Standards

• EN 4529-001: Aerospace series – Sealing plugs – Part 001 Technical Specification
  Defines general technical requirements applicable to sealing plugs across classes.

• EN 4529-002: Aerospace series – Sealing plugs – Part 002 Index of Product Standards
  Provides a comprehensive index for product standards related to sealing plugs.

• ISO 13000-2: Plastics – PTFE semi-finished products – Preparation of test specimens and property determination
  Specifies material standards for the PTFE used in manufacturing sealing plugs.

• EN 2591 Series: Aerospace test methods for elements of electrical and optical connection
  Detail testing methodologies referenced in EN 4529-003 for verifying plug performance.

• EN 2997-001: Aerospace circular electrical connectors – Technical Specification
  Covers connector performance characteristics relevant when integrating sealing plugs.

By complying with SIST EN 4529-003:2009 and its associated standards, manufacturers and aerospace integrators can ensure that electrical and optical connection sealing plugs meet stringent quality and performance criteria, essential for safe and durable aerospace operations.

Keywords: EN 4529-003, aerospace sealing plugs, Class T sealing plugs, electrical connection sealing, optical connection sealing, PTFE plugs, aerospace standards, cable sealing grommets, aerospace connectors, high temperature sealing