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rasselstein® CFPA – a move towards a chromium-free future

thyssenkrupp Rasselstein now offers its customers rasselstein® CFPA (Chromium-Free Passivation Alternative), a 100-percent chromium-free passivation on the surface of tinplate. The innovative product ready for series production offers the same functionality as the previous chromium-based passivations 300 or 311.

According to the REACH regulation, Chromium(VI) compounds, which to date have been used for the production of tinplate passivation, may only be used for a limited period. The time has come for a chromium-free passivation alternative.

In the context of surface treatments, passivation refers to the targeted application of a protective layer on a metallic material which prevents or significantly slows down oxidation of the base material.

thyssenkrupp launches rasselstein® CFPA on the market

surface of packaging steel

thyssenkrupp Rasselstein now offers rasselstein® CFPA, a chromium-free alternative product based on titanium which can be used for all tinplate applications. CFPA is fully compliant with EU and FDA regulations1) and is approved both for coated as well as uncoated tinplate for contact with foodstuffs. The draft of the Euronorm EN10202 therefore describes CFPA as the new European standard.

1) http://www.accessdata.fda.gov/scripts/fdcc/?set=fcn&id=1661

New passivation impresses with surface properties

Packaging Steel

rasselstein® CFPA effectively minimizes the tin oxide growth during storage, providing the same functionality as chromium-based passivation. It gives tinplate high-quality surface properties, such as a brilliant appearance, best lacquer adhesion, excellent wettability, and very good direct printability. Comprehensive tests have confirmed that suitable lacquer systems are available for existing application purposes.

To check the resistance with various food products, storage tests up to several years were performed in addition to laboratory tests. On behalf of thyssenkrupp Rasselstein, the SSICA Institute in Parma performed representative storage tests with two products typically filled in food cans: chickpea puree and diced tomatoes with basil. The study shows no differences between rasselstein® CFPA and the previous chromium-based standard 311 for 12-month storage of the test products at 20° C and 37° C. Corrosion characteristics and sulphide staining resistance were identical.

To sum up, SSICA confirms that rasselstein® CFPA is fully suited for canning food.

Comprehensive support for customers

technical customer service at Packaging Steel

When transitioning to rasselstein® CFPA, customers of thyssenkrupp in Andernach can rely on the full support of technical customer service, which will advise them on all issues. In addition, the network of lacquer suppliers, packaging steel manufacturer, packaging manufacturers and fillers, established by thyssenkrupp Rasselstein ensures that the conversion to tinplate with chromium-free passivation works as smoothly as possible.

The gradual, irreversible conversion of the tinning lines in Andernach started in 2019. This will increase market availability of tinplate with chromium-free passivation. Customers can now convert their tinplate packaging to the new chromium-free passivation.

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