Limpet teeth dethrone spider silk as the strongest known natural material

Engineers at the University of Portsmouth found that the teeth of limpets — marine snails that grind rock as they feed — have a tensile strength roughly five times that of most spider silk, making them the strongest natural material measured. The teeth withstand pressures on the order of what turns carbon into diamond; lead author Asa Barber likened it to a single strand of spaghetti supporting about 3,300 one-pound bags of sugar. The findings were published in the Journal of the Royal Society Interface.

The strength comes from the teeth’s composite structure: nanofibers of goethite, an iron-bearing crystal, embedded in a protein matrix. That architecture is what makes the material both hard and flexible. It doesn’t beat engineered materials like graphene, but its upper range rivals top-grade carbon fiber and clearly outperforms Kevlar.

The practical hook is biomimicry — composites that are strong yet flexible are exactly what engineers want for next-generation structures and machines, so the limpet’s tooth design is a candidate to copy. The article also flags a common terminology pitfall: its ‘strength’ figures refer to tensile strength (resistance to being pulled apart), which is distinct from hardness or compressive strength, the metrics used when comparing materials like diamond, wurtzite boron nitride, and lonsdaleite.