Polyamide 11 (PA11) is a relatively expensive material with specific fields of application, notably in the automotive industry (fuel and pressure lines, filters, bearings). The material exhibits considerable similarity with PA12 and also possesses excellent resistance to and low permeability of petrol.
PA11 is subject to thermal ageing, so the temperature at which standard types are used must remain below 70°C. Of all polyamides (except PA12), PA11 absorbs the least moisture, namely 0.9% at 23°C/50% RH and 1.9% after saturation in water at 23°C. Its impact resistance is excellent, as is its chemical resistance to oils, greases, aliphatic hydrocarbons and alkaline substances. It is not resistant to certain concentrated acids and chlorinated hydrocarbons.
PA11 has high wear and impact resistance that is unaffected by the absorption of moisture. When reinforced with glass fibre, the material is reasonably resistant to deformation at temperatures up to approximately 60°C, but this resistance deteriorates significantly at higher temperatures. PA11 ranks among the polyamides with the highest electrical resistance, partly thanks to its low absorption of moisture.