When sourcing titanium components for medical devices, understanding the difference between ASTM F136 and ASTM F67 standards is fundamental to making informed procurement decisions. These standards define the chemical composition, mechanical properties, and manufacturing requirements for titanium materials used in surgical implant applications [3].
ASTM F67 specifies commercially pure (CP) titanium in four grades (1-4), each with varying oxygen content that affects strength and ductility. Grade 1 offers the highest formability and corrosion resistance, while Grade 4 provides the highest strength among CP titanium grades. This standard is typically used for non-load-bearing applications such as cranial plates, dental abutments, and surgical instruments [3].
ASTM F136 covers wrought titanium-6 aluminum-4 vanadium ELI (Extra Low Interstitial) alloy, commonly known as Grade 23. This alloy offers superior mechanical properties with a tensile strength of approximately 860 MPa compared to 350-480 MPa for CP titanium. It is the preferred material for load-bearing orthopedic implants including hip joints, knee replacements, and spinal fixation devices [3].
ASTM F136 vs F67: Technical Comparison for Medical Applications
| Specification | ASTM F67 (CP Titanium) | ASTM F136 (Ti-6Al-4V ELI) | Best For |
|---|---|---|---|
| Material Type | Commercially Pure Titanium Grades 1-4 | Titanium Alloy Grade 23 | Application-dependent |
| Tensile Strength | 350-480 MPa (Grade 1-4) | ~860 MPa | F136 for load-bearing implants |
| Yield Strength | 240-450 MPa | ~795 MPa | F136 for high-stress applications |
| Elongation | 15-24% | ~10% | F67 for better formability |
| Cost Premium | Baseline | 20-30% higher than F67 | F67 for cost-sensitive projects |
| Primary Applications | Cranial plates, dental abutments, surgical tools | Hip/knee/spinal implants, load-bearing devices | Based on mechanical requirements |
| Biocompatibility | ISO 10993 certified | ISO 10993 certified | Both suitable for implant use |

