IEC 60684-3-233:2006

Overview - IEC 60684-3-233:2006 (heat-shrinkable fluoroelastomer sleeving)

IEC 60684-3-233:2006 specifies requirements for heat-shrinkable fluoroelastomer sleeving that is flame retarded, fluid resistant and has a nominal shrink ratio of 2:1. The standard covers two types for use at temperatures up to 200 °C:

• Type A - thick wall
• Type B - thin wall

Typical supplied sizes are up to 51 mm recovered internal diameter and the standard colour is black. The document is one sheet of IEC 60684‑3 and references IEC 60684‑1, IEC 60684‑2 and other test standards (ISO 1817, ISO 846, IEC 60757).

Key topics and technical requirements

The standard defines designation, test conditions and detailed property limits. Key technical topics include:

• Design & sizing: expanded/recovered internal diameters, recovered wall thickness and mass per unit length (Tables 1 & 2).
• Mechanical properties: minimum tensile strength (≈8–10.5 MPa depending on test), minimum elongation at break (typically ≥150–250%), secant modulus limits.
• Electrical properties: breakdown voltage requirements by recovered wall thickness (Table 4), and volume resistivity minimums (≥10^9 Ω·m order as per clause references).
• Thermal performance: heat shock and heat ageing tests (heat at 250 °C ±5 K for short term), and a long-term ageing requirement (ageing at 200 °C; long-term test introduced to replace IEC 60216 thermal endurance).
• Flame and environmental resistance: flame propagation limits (max burning time 30 s, max length 75 mm), copper corrosion limits, water absorption (max 1.0 %), fungus resistance and colour fastness requirements.
• Fluid compatibility: immersion resistance to representative fluids used in aviation and industry (e.g., gasoline, kerosene, silicone‑based fluids, mineral and synthetic hydraulic oils, de-icers) at specified temperatures (Table 5).

Applications and who uses this standard

IEC 60684-3-233 is targeted at applications that require high‑temperature, flame‑retardant and fluid‑resistant insulation, for example:

• Aerospace and aviation wire harness protection (fuel/oil exposure)
• Military and defense electrical systems
• Industrial equipment exposed to hydraulic fluids, fuels or de‑icing chemicals
• High‑temperature electrical insulation and strain relief in demanding environments

Typical users:

• Product designers and material engineers selecting sleeving
• Manufacturers and suppliers of heat‑shrink sleeving
• Test laboratories and compliance/quality teams
• Procurement and specification authors in aerospace, automotive and industrial sectors

Related standards

• IEC 60684‑1 (definitions and general requirements)
• IEC 60684‑2 (methods of test)
• IEC 60757 (colour designation)
• ISO 1817 (rubber – effect of liquids)
• ISO 846 (fungus evaluation)

Keywords: IEC 60684-3-233, heat-shrinkable fluoroelastomer sleeving, flame retardant sleeving, fluid resistant insulation, shrink ratio 2:1, high temperature sleeving, aerospace wire protection.