EstablishedWeak in compression; hygroscopic, so must be protected from the environment.
Aramid fibres are generally weak in compression and absorb moisture — parts have been reported to take up as much as 8 per cent of their weight in water — so aramid parts must be protected from the environment; they are also difficult to drill and cut.
- precision note: Eight per cent is the upper bound of moisture uptake the handbook attributes to service reports on some parts, not a property of the fibre.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Department of Transportation, Federal Aviation Administration, Flight Standards Service 2023 Primary authority