The aerospace and unmanned aerial vehicle (UAV) industries have always imposed stringent requirements on materials: lightweight to reduce payload, yet resistant to high temperatures, low temperatures, vibration, and radiation. Under these extreme conditions, liquid silicone rubber (LSR), with its excellent temperature resistance, low density, and good elastic recovery, is extending its role from traditional sealing components to more functional parts.

The core material requirements for aerospace are: a wide operating temperature range (‑60 °C to 250 °C or higher), low density, radiation resistance, and long‑term reliability. LSR typically has a density between 1.0 and 1.2 g/cm³, significantly lower than metal seals, contributing to structural lightweighting. At the same time, it maintains elasticity under thermal cycling, resisting embrittlement or hardening. This makes it suitable for applications such as aircraft door seals, engine‑area protection, and potting of onboard electronic equipment.

In the UAV sector, the use of LSR is growing rapidly. UAV motors generate substantial heat at high speeds, requiring potting compounds that balance thermal conductivity and electrical insulation. Seals at fuselage joints need to withstand vibration and rain erosion. Coatings for flight control modules must resist moisture and salt spray. All these scenarios align well with the performance characteristics of LSR.

Looking at industry trends, the development of the low‑altitude economy and commercial space is expected to drive rapid growth in the production of UAVs and small satellites, expanding the demand for high‑performance sealing and protective materials. Furthermore, conditions in space – vacuum, radiation, extreme temperature differentials – open new application directions for specialty liquid silicone rubbers, such as fluorosilicone elastomers.

When selecting materials, key parameters to consider include: temperature range, density, radiation stability, and compatibility with aerospace‑grade substrates such as aluminum alloys and carbon fiber. For manufacturers of aerospace and UAV components, LSR represents a material approach that balances lightweighting with high reliability – one worth evaluating during the design phase.

More information, please click here.