TCP-HF®
The original, MIL-DTL approved clear trivalent suite of chemistries.
We have multiple products for both Chromate Conversion and Anodizing Chemistry. Variations include spray, powder, pen, cleaners, dyes, deoxidizers and more.
CHEMEON TCP-HF (Hexavalent Free) is recognized as the legacy, clear finish trivalent chromium conversion coating, chemfilm and anodic seal solution. Born from U.S. Naval innovation, CHEMEON’s Dr. Sjon Westre was first to commercialize and scale its production. Replacing the known carcinogen hexavalent chromium with a safer, high-performance alternative, TCP-HF meets MIL-DTL-81706B, MIL-DTL-5541F Type II, TT-C-490 Type VI and ASTM B921 standards while delivering exceptional corrosion resistance and adhesion on light metals.
CHEMEON’s suite of TCP-HF products retain electrical conductivity and are REACH, RoHS, WEEE and ELV compliant.
CHEMEON TCP-HF EPA (Extended Protection Additive) is used in conjunction with TCP-HF in chemical conversion applications. TCP-HF + EPA provides a more robust solution and increasing salt spray resistance for difficult alloys such as 2024.
CHEMEON TCP-HF Touch-Up Pen is an industry standard for a clear finish on small part touch ups, MRO and field repair. Easy to use 1.5 oz pen applicator is in stock and ready to ship. For use on aluminum alloys, magnesium, IVD aluminum, zinc and zinc alloys, zinc-nickel and cadmium. CHEMEON Cleaner 4100 Pen, single step cleaner and acid activator, is also available.
CHEMEON TCP-NP (No Prep) is a two component product that does not require a deoxidization step.
Download Chemeon TCP-HF as Anodic Seal Fact Sheet
FAQs: TCP-HF
What is TCP-HF and its history with CHEMEON?
TCP-HF (Hex Free) is the first commercial hex-free version of the Navy’s Trivalent Chromium Process (TCP), commercialized by CHEMEON CTO Dr. Sjon Westre. With a clear to iridescent coating appearance, TCP-HF remains a highly effective, MIL-DTL qualified conversion coating trusted worldwide for corrosion protection and adhesion.
Can I speak directly with Dr. Sjon Westre about my trivalent chrome needs?
Yes. As the expert who first commercialized TCP as TCP-HF and an AMPP award-winning educator, Dr. Westre is available for customer-specific discussions on process challenges, optimization, qualification, and tailored solutions. Contact us to schedule.
How does TCP-HF compare to eTCP?
TCP-HF is the foundational reliable performer. eTCP® builds on it with a signature exclusive purple/violet visual color indicator for instant verification while maintaining or exceeding performance. Both are QPL-listed and fully supported.
Is TCP-HF qualified under military specifications?
Yes — meets MIL-DTL-81706 and MIL-DTL-5541 Type II requirements for Class 1A and Class 3 applications.
Can TCP-HF be used in field or repair applications?
Yes, our QPL Touch-Up Pen is available internationally with easy military purchasing via Defense Logistics Agency (DLA) and National Stock Numbers. For enhanced field performance, consider our SurfGard wipe/brush touch-up kits or upgrade to eTCP®.
How does 3D metrology support TCP-HF processes?
The VK-X3000 provides quantitative surface analysis to verify uniformity and process consistency.
Does CHEMEON offer training on TCP-HF?
Yes — our exclusive classes, often led or informed by Dr. Westre’s expertise, cover best practices for trivalent conversion coatings including TCP-HF.
Is TCP-HF still recommended for new programs?
Absolutely — it is a proven, cost-effective solution. We also guide customers toward eTCP® for the signature purple/violet visual color indicator, or the latest innovation ECC-PRO™ Chemeon’s electrolytic conversion coating for advanced needs and future MIL-DTL-81706 Revision C readiness.
How do I get started with TCP-HF or discuss upgrades?
Request samples, technical data, or a direct consultation with Dr. Westre to discuss your specific needs or golas.. Our team provides full implementation support.
Are CHEMEON products available through NSN / DLA, and how can global military partners in the US and Europe access them?
Yes — many CHEMEON products, including eTCP® and TCP-HF trivalent chromium conversion coatings, are available through the Defense Logistics Agency (DLA) via National Stock Numbers (NSNs). This provides streamlined procurement for U.S. military and authorized partners.
For global military partners:
- United States: Direct access through DLA, primes, and authorized distributors with NSN support for qualified products.
- Europe and International: Availability through our authorized international distributor/resellers, enabling efficient supply to NATO and allied forces. CHEMEON maintains strong compliance with MIL-DTL, REACH and other international standards to support global defense and environmental programs.
Our team can assist with tailored procurement solutions. Contact us directly info@chemeon.com for current NSN listings, availability, or to discuss your specific military or international requirements. Dr. Sjon Westre and the technical team are available for technical discussions on compliance and application.
FAQs: MIL-DTL-81706 Chemical Conversion Materials
What is MIL-DTL-81706 and why does it matter for aluminum surface finishing?
MIL-DTL-81706 is the U.S. Department of Defense detail specification for chemical conversion materials used to form protective coatings on aluminum and aluminum alloys. It qualifies the chemistry (listed on QPL-81706), which must then meet performance requirements under MIL-DTL-5541. Key benefits include corrosion protection, paint adhesion, and electrical properties for aerospace, defense, and OEM applications. Type II (trivalent chromium or non-hexavalent) options are increasingly preferred for regulatory compliance.
What are the main differences between Type I and Type II under MIL-DTL-81706?
Yes — QPL-listed for MIL-DTL-81706 (Type II, Class 1A and 3) in multiple forms and methods. Proven in aerospace, Navy, Army, Marine, Space, and OEM applications.
- Type I: Contains hexavalent chromium (Cr(VI)) — traditional but restricted due to toxicity and environmental regulations.
- Type II: Hexavalent-free (trivalent chromium or alternatives) — RoHS/REACH compliant, safer, and the future standard. Both deliver equivalent performance within classes when using QPL-listed products, but Type II is recommended for new programs. CHEMEON’s eTCP® line is fully qualified Type II.
Which Classes and Methods are covered under MIL-DTL-81706?
Yes — QPL-listed for MIL-DTL-81706 (Type II, Class 1A and 3) in multiple forms and methods. Proven in aerospace, Navy, Army, Marine, Space, and OEM applications.
- Class 1A: Maximum corrosion protection (unpainted or painted parts).
- Class 3: Low electrical resistance (for electrical/electronic applications).
- Methods: A (immersion), B (spray), C (brush), plus touch-up/repair options.
- Forms: Include RTU liquids, powders, and pens for field/MRO use. CHEMEON eTCP® products qualify across multiple forms/methods for maximum flexibility.
Is CHEMEON eTCP® qualified under MIL-DTL-81706?
Yes. CHEMEON’s patented eTCP® (including RTU, Powder, TCP-HF, and touch-up kits) is listed on QPL-81706 for Type II, Class 1A and 3 applications. It provides a distinctive purple/violet visual color indicator that parts are properly coated and protected—unique among qualified options. Recent qualifications support immersion, spray, brush, wipe, touch-up pen and anodic sealing uses.
How does CHEMEON eTCP® compare for aerospace and military applications?
eTCP® excels in demanding environments (e.g., 2024 aluminum, 3D-printed parts, Navy MIL-DTL qualified, available on the Qualified Product List https://qpldocs.dla.mil) with superior corrosion resistance, paint adhesion, and electrical properties—often matching or exceeding legacy hexavalent chrome performance. It supports MRO field repairs, OEM production, and available internationally. Third-party validated data available for NSS and all MIL-DTL parameters.
Where can I find QPL-listed CHEMEON products or request support?
View our QPL qualifications at https://qpldocs.dla.mil, contact Chemeon or register for access to download technical data sheets, order samples, and request support. We offer full-service expertise for MIL-DTL-81706 compliance, including ECC-PRO, Electrolytic Conversion Coating Process advancements.