noun, noun which may take the genitive case particle 'no'
ductility; malleability
Technical term in materials science and engineering. Refers to the ability of a solid material to deform under tensile stress; often characterized by the material's ability to be stretched into a wire.
金は延性に富んだ金属です。
Gold is a metal with high ductility.
この合金
This alloy has low ductility, so it is difficult to process.
From 延 (えん, 'stretch') + 性 (せい, 'property'). The kanji 延 suggests extending or lengthening, which matches the concept of ductility.