ASTM F67 vs ASTM F136: A Comprehensive Guide to Medical Titanium Materials

Introduction

In orthopedic, dental, and medical device manufacturing, ASTM F67 (commercially pure titanium) and ASTM F136 (Ti-6Al-4V ELI titanium alloy) are two core material standards. Choosing the wrong material can affect the long-term performance of implants and surgical outcomes. Bokang titanium provides a clear comparison of both standards, key differences, clinical applications, and FAQs to help make informed material decisions.

Quick Selection Guide

Key takeaway: Choose F136 for high load-bearing and fatigue resistance; choose F67 for maximum biocompatibility, complex shaping, or bone integration applications.

Key Differences Explained

1. Material Composition and Biocompatibility

• F67 (CP-Ti): High purity titanium with stable oxide layer, excellent biocompatibility, no alloy elements.

• F136 (Ti-6Al-4V ELI): Contains 6% aluminum (strength) and 4% vanadium (toughness). Decades of clinical use confirm safety and performance.

2. Mechanical Performance

• Strength: F136 is ~1.5–2× stronger than F67 Gr4.

• Fatigue resistance: F136 performs better under high cyclic loads, critical for joint implants.

• Ductility: F67 has higher elongation, easier to shape; F136 balances strength and toughness.

3. Manufacturing and Processing

• Forming: F67 is easier to cold-form, bend, and shape, suitable for intraoperative adjustments.

• Machining & Welding: Both can be machined/welded; F136 is harder and causes more tool wear.

• 3D Printing: F67 preferred for porous structures for bone ingrowth; F136 for load-bearing porous or solid parts.

Clinical Applications

Orthopedics & Spine

• Recommended: F136

• Examples: Hip/knee stems, spinal fusion implants, long bone plates and nails

• Reason: High mechanical loads require superior strength and fatigue resistance.

Dental & Oral Surgery

• Recommended: F67 (Grade 3/4)

• Examples: Dental implants

• Reason: Biocompatibility and bone integration are more important than maximum strength.

Craniofacial & Neurosurgery

• Recommended: F67

• Examples: Cranial/face repair plates and meshes

• Reason: Non-load-bearing areas; high formability and biocompatibility needed.

Medical Device Components

• F67: Pacemaker shells, surgical instruments in contact with tissue

• F136: High-strength instrument handles or load-bearing components

• 3D-printed porous structures: F67 for bone ingrowth; F136 for load-bearing custom implants

Frequently Asked Questions (FAQ)

Q1: Is aluminum and vanadium in F136 safe?
A: Yes. Over 40 years of global clinical use and surface oxide protection ensure safety. Only extremely rare cases (e.g., severe kidney dysfunction) might warrant using pure titanium.

Q2: Why are dental implants mostly F67 instead of F136?
A: Dental implants rely on stable bone integration rather than extreme mechanical load. F67 provides excellent biocompatibility and sufficient strength.

Q3: Which material for 3D-printed porous implants?
A: F67 for porous structures to enhance bone ingrowth; F136 for load-bearing porous or solid structures.

Q4: How to choose the right material based on implant location?

• High load-bearing/cyclic stress areas → F136

• Bone integration with low load → F67

• Areas requiring bending or shaping → F67

• Porous structures for bone ingrowth → F67

Conclusion

ASTM F67 and F136 are complementary rather than competing standards:

• F136 = strength and load-bearing expert

• F67 = biocompatibility and formability champion

Choosing the right material depends on implant function, mechanical load, manufacturing process, and regulatory requirements. Understanding these standards is the first step toward safe and effective implant design.

Need help selecting materials for your medical devices?
Changzhou Bokang Special Materials provides full-range ASTM F67 and F136 titanium solutions and offers technical support from material selection to manufacturing guidance.

Get a free material evaluation or contact our engineers for one-on-one consultation.