Aerospace Epoxies from Permabond

Why use Permabond epoxies for aircraft and space bound applications?

Permabond have a range of high strength, high performance epoxy adhesives, some of which have been developed specifically for the aerospace industry.

Epoxies allow for the bonding of components without increasing weight in the same way that mechanical fasteners would which is essential for aircraft and space applications. Other features of epoxies that make them perfect for aviation and space include their ability to withstand high temperatures, vibration and stress resistance, and specialised low outgassing formulations.

Permabond ET5422, ET5423 and ET5424 are all two-part epoxies developed specifically for the aerospace industry. They offer outstanding strength and performance even in harsh environments and can bond lightweight composites and delicate components in aircraft and space equipment.

Permabond ET5422 Structural Epoxy

Epoxies lend themselves to customisation making it possible to design formulations to match customer needs, which is how ET5422 started out.

ET5422 is a pioneering two-part epoxy developed for the aerospace industry. This formulation was designed to bond lightweight composite components for aircraft seating to avoid using fasteners to keep weight low. It also needed to be rugged (high strength, durable and withstand harsh environments) as well as withstand torsion forces.

This epoxy is stronger than ET5429, which already had an incredibly high peel strength, having a peel strength of 320 N/25mm (70 PIW), higher than almost any other epoxy available.

Alternatively, Permabond ET5423 is the exact same but in black (ET5422 is blue). With all the same benefits as ET5422 just better colour matched to carbon fibre and darker substrates for more seamless bonding.

Both epoxies are ideal for applications with impact, vibration, and bond stress risks, making them also suitable for automotive and general assembly. Their ability to bond composite and dissimilar substrates also lends themselves to prosthetics, sports equipment, and other composite markets.

Key Benefits of ET5422 & ET5423:

Replaces welding and mechanical fixtures
High resistance to impact and vibration
Thixotropic with excellent flow control
Ease of mixing and dispensing
Good gap filling capabilities
Bonds a range of metals including aluminium and stainless steel
Ability to bond dissimilar substrates i.e. stainless steel to carbon fibre

Permabond ET5424 High Temperature Epoxy

ET5424 is another Permabond epoxy specifically developed for space-based industries. It offers high heat resistance, withstanding temperatures ranging from -40°C up to 230°C which makes it ideal for powder coating applications. The cured adhesive will also withstand the oven heating process of paint baking to ensure a smooth, even finish.

In a vacuum such as space cured adhesives can emit vapours which affect sensitive components like optics and sensors. Permabond ET5424 meets ECSS-Q-ST-70-02C requirements for thermal outgassing, meaning it helps to prevent this and allow components to remain at optimal performance.