Flame-Resistant Polymers for Space Safety and Aerospace Use

NASA advances flame-resistant polymers to improve safety in microgravity and high-oxygen aerospace environments.

Understanding flammability on Earth is already complex; however, space introduces additional challenges, including microgravity and oxygen-enriched, pressurized environments. These conditions alter flame behavior, heat transfer, and material response. As a result, NASA and its partners have developed specialized testing methods and polymer systems to control fire risks in orbit and beyond.

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From spacesuits to the International Space Station (ISS), every electrical system, structural component, and cabin material undergoes rigorous flammability evaluation. Polymers, in particular, present unique challenges due to their tendency to ignite, sustain combustion, and release heat. Consequently, NASA engineers focus on understanding ignition thresholds, flame propagation, and heat release behavior to ensure mission safety.

Evaluating Flammability in Space

To support aerospace development, NASA provides open access to its Technical Standards System (TSS), which standardizes materials testing and qualification procedures.

Two key standards define flammability requirements:

• NASA-STD-6001: Flammability, offgassing, and compatibility testing
• NASA-STD-6016: Materials and processes requirements for spacecraft

Together, these standards establish a framework for evaluating fire behavior under space-relevant conditions, including reduced gravity and elevated oxygen concentrations. Although originally developed for metals and ceramics, they now guide the qualification of advanced polymer systems increasingly used in long-duration missions.

As polymer usage expands in aerospace applications, testing methods must also evolve. This has driven the development of new experimental approaches that account for flame spread, material degradation, and combustion dynamics in non-terrestrial environments.

Polymer-Based Fire Safety Solutions

NASA collaborates with commercial, academic, and international partners to develop polymer solutions that improve fire resistance in space systems.

One key strategy involves incorporating flame-retardant additives into thermoplastics. At Kennedy Space Center, researchers developed polyhydroxyamide (PHA) and polymethoxyamide (PMeOA) additives that enhance fire resistance in polymers such as nylons, polyesters, and acrylics. These additives significantly reduce heat release and combustion rates, while in some cases also improving mechanical performance and processability.

Material selection also plays a critical role. In collaboration with Honeywell, NASA evaluated aerospace-grade thermoplastics and identified fluorinated polymers as top performers. Materials such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), and fluoroelastomers exhibit low flame propagation, even under varying oxygen concentrations. High-performance polymers like Nomex (aramid) and Solimide (polyimide) also demonstrate inherent flame resistance and durability in extreme environments.

In addition, polymer fibers and textiles provide critical protection. Since the Apollo era, NASA has advanced flame-resistant fabrics for crew safety. Polybenzimidazole (PBI) fibers, developed in collaboration with Celanese, retain strength and flexibility after flame exposure, making them suitable for spacesuits and habitat applications.

Extending Fire Safety Beyond Space

Decades of aerospace research have significantly expanded the understanding of polymer flammability under extreme conditions. These advances are now influencing material design beyond space applications.

As testing methods and material innovations continue to evolve, flame-resistant polymers developed for microgravity and high-oxygen environments are increasingly relevant to aviation, defense, and emergency response sectors. Ultimately, technologies developed for space safety are helping improve fire protection standards across industries on Earth.