ASTM F136 — Wrought Ti-6Al-4V ELI alloy for surgical implants
Also known as: ASTM F136 ELI
The American specification for extra-low-interstitial Ti-6Al-4V titanium alloy used in surgical implants.
What it covers
| scope | Requirements for wrought Ti-6Al-4V ELI alloy used in surgical implant applicationsVerified spec[1] |
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What it means in practice
The ELI designation — extra low interstitial — means tighter limits on oxygen, nitrogen and carbon than standard Ti-6Al-4V, giving better fracture toughness. Where a manufacturer names ASTM F136 ELI rather than simply "titanium alloy", it is being specific about a property that matters for fatigue resistance.
Sources
Numbers match the citations beside each claim above.
Primary sources
- [1]ASTM International — standards catalogue — ASTM International. Accessed 2026-07-22.