What Is ASTM Titanium? Understanding Implant-Grade Metals in Piercing
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The Meaning of ASTM F136 Titanium
If you’ve ever heard your piercer mention “ASTM titanium” or “implant-grade titanium,” you might wonder what that really means.
ASTM F136 titanium refers to a specific grade of titanium alloy defined by the American Society for Testing and Materials (ASTM International) under standard F136.
ASTM is a globally recognized organization that establishes technical standards for materials used in medicine, engineering, and manufacturing.
In body piercing, ASTM F136 titanium is highly valued for its biocompatibility, corrosion resistance, and lightweight strength. It’s the same metal used in surgical implants, which means it’s proven safe for long-term contact with the human body.
The Science Behind ASTM Standards
ASTM International publishes various titanium standards that define purity, performance, and mechanical strength.
Some key ones include:
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ASTM B265 – Titanium and titanium alloy sheets and plates
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ASTM B348 – Titanium bars and billets
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ASTM B861 – Seamless titanium alloy tubes
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ASTM F67 – Commercially pure titanium for surgical implants
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ASTM F136 – Titanium-6Aluminum-4Vanadium ELI (Extra Low Interstitial) alloy for surgical implants
The last one — ASTM F136 — is the standard used for implant-grade titanium jewelry. “ELI” (Extra Low Interstitial) means the material has extremely low levels of impurities such as oxygen, nitrogen, and carbon — making it exceptionally clean and safe inside the body.
What About “G23 Titanium”?
You’ll often see jewelry labeled as G23 titanium. While the “G” stands for “Grade,” it’s not an official ASTM or ISO designation by itself.
In practice, Grade 23 (G23) titanium is the same alloy composition as ASTM F136, and when properly manufactured, it meets the same medical-grade standard.
So when you see “G23 titanium,” it usually means it complies with the ASTM F136 specification for implant-grade titanium used in orthopedic implants and surgical tools.
Why Implant-Grade Metals Matter in Piercing
Not every metal is safe to wear inside a fresh piercing. Only a few materials have been tested and approved for long-term implantation in the human body.
Safe materials for new piercings must:
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Withstand autoclave sterilization (high heat and pressure)
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Be chemically stable and non-reactive
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Cause no irritation, allergy, or infection when worn long-term
That’s why ASTM F136 titanium — along with other approved materials like ASTM F138 implant-grade stainless steel, 14K–18K gold, and niobium — are the gold standard for professional piercers.
The Role of Material Certification
Professional piercers and reputable jewelry manufacturers obtain mill certificates or material test reports to prove that their metal meets ASTM or ISO standards.
These certificates come from the raw material supplier and confirm the alloy’s exact composition, purity, and manufacturing process.
Some high-end jewelry brands go further, conducting biocompatibility tests through independent laboratories to ensure the metal performs safely when implanted in living tissue.
A trustworthy piercer or studio can show you this documentation upon request — it’s part of maintaining full transparency and professional responsibility.
Why Piercing Studios Choose ASTM F136 Titanium
At Piercing Lab, we use ASTM F136 titanium not just because it’s beautiful, but because it’s proven safe.
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Hypoallergenic: contains no nickel, reducing allergic reactions.
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Corrosion-resistant: doesn’t rust or discolor, even in moist environments.
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Biocompatible: the body accepts it without inflammation or rejection.
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Autoclavable: fully safe to sterilize under medical-grade conditions.
These qualities make it the top choice for initial piercings, where healing tissue is most sensitive.
Final Thought
In modern piercing and medical applications alike, ASTM F136 titanium plays an essential role. Its purity, durability, and biocompatibility make it one of the safest materials for both surgical implants and professional body jewelry.
When choosing jewelry for a new piercing, always ask your piercer about ASTM or ISO certification — because true safety starts with science, not marketing labels.
References:
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Association of Professional Piercers. Jewelry for Initial Piercings. https://safepiercing.org/jewelry-for-initial-piercings/
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ASTM International. Standard Specification for Titanium and Titanium Alloy Castings. https://www.astm.org/b0367-22.html
