Helping Customers Move Forward
In industrial packaging, closures are critical. They keep products secure, protect integrity, and ensure compliance. For decades, many closure systems relied on Cr6 (hexavalent chromium) passivation because of its excellent corrosion resistance. However, Cr6 is classified as a carcinogen and is subject to increasingly strict regulations around the world. The European Union has already restricted its use under frameworks like RoHS and ELV, and OSHA sets limits on workplace exposure in the United States. The regulatory direction is clear: Cr6 is being phased out.
Why Tri-Sure Made the Switch
Tri-Sure chose to move completely away from Cr6 and standardize on Cr3 (trivalent chromium) passivation nearly a decade ago. This decision was not only about compliance but also about creating a safer and more sustainable closure system. Through extensive testing, Tri-Sure confirmed that Cr3 delivers equal or better performance compared to Cr6 in key areas such as flange curling, plug threading, lacquer adhesion, drop resistance, and corrosion protection.
Cr3 also supports safer workplaces and aligns with customer sustainability policies. The improvement is visibly clear, Cr3 closures have a platinum-colored finish compared to the gold tone of Cr6.
Why a Full Cr3 Closure System Matters
Some suppliers have tried to bridge the gap by applying a lacquer on top of components that are still plated with Cr6. This can be misleading and does not deliver the same safety or compliance benefits as a Cr3 closure system.
Customers should be cautious of this approach for several reasons:
- Compliance risk: Regulations are moving toward eliminating Cr6 entirely. A partial solution may still leave restricted substances in the system.
- Material safety: A full Cr3 closure ensures that all metal surfaces are free from Cr6, reducing risk across the entire package and supply chain.
- Sustainability integrity: Be cautious that your lacquered closures are plated with Cr3, and ask your supplier for certification.
The Takeaway
Cr6 may have been the industry standard for years, but regulations and sustainability priorities are pushing the market in a new direction. Tri-Sure’s commitment to Cr3 closures ensures customers receive the same trusted performance while avoiding the risks tied to Cr6. By selecting a full Cr3 closure system, companies can stay compliant, strengthen their sustainability profile, and protect the reliability of their packaging.
Have more questions? Click here to check out our FAQs about Chromium (III) passivation
