How the Space Environment Shapes Connector Materials

From Outgassing to Thermal Stability: Why Material Selection Matters in Space

When connectors enter space, it is not only the operating environment that changes—the requirements for material performance change as well.

Extreme temperatures, vacuum conditions, and thermal cycling can place significant demands on connector materials, affecting their stability, dielectric performance, and long-term reliability.

For space interconnects, material selection is therefore not simply a matter of choosing a suitable material. It is part of the overall connector reliability strategy.

When the Environment Changes, Materials Matter

On Earth, connector materials operate under relatively predictable atmospheric conditions. In space, however, the combination of vacuum and extreme environmental conditions can significantly change how materials behave.

Under near-vacuum conditions, certain non-metallic materials used in connectors may undergo outgassing, releasing volatile substances that can condense on colder surfaces. For sensitive equipment such as optical payloads and sensors, these deposits may affect performance.

Therefore, materials used in space connectors must meet stringent low-outgassing requirements. Key indicators such as TML (Total Mass Loss) and CVCM (Collected Volatile Condensable Materials) need to be carefully considered during material selection.

Thermal Cycling Creates Another Material Challenge

Outgassing is only one part of the material challenge. Temperature variations in the space environment can also have a significant effect on connector performance.

Extreme temperatures and repeated thermal cycling can cause connector materials to expand and contract. When different materials within the connector have different coefficients of thermal expansion (CTE), these dimensional changes can introduce additional mechanical stress at their interfaces.

For space connectors, material selection therefore needs to consider more than temperature resistance alone. Dimensional stability, dielectric performance, and environmental stability are also important to maintaining reliable performance under demanding space conditions.

Materials for Space Reliability

For space connectors, material selection is fundamental to achieving environmental compatibility and reliable performance.

The right material needs to be considered in relation to the connector's operating environment, including vacuum conditions, outgassing requirements, temperature variation, thermal cycling, and dielectric performance.

This is why material selection should be addressed as part of the connector design process—not as a separate consideration after the design is complete.

At SUNKYE, our aerospace connector solutions are developed with material selection tailored to the requirements of demanding space applications, supporting reliable connectivity across a range of aerospace systems.

In space, the right materials make reliable connections possible.