New Phthalate-free PVC-based Sealant Range for Metal Packaging
A new generation of sealants free of phthalate-based plasticizers is available for one-component metal sealing systems. The company, Henkel Adhesive Technologies, is offering the new sealant range under their Darex Cov brand. The company reports that these new formulations will ensure more reliable sealing of metal packaging with the added benefit of improved health and environmental credentials.
The phthalate-free PVC-based compounds will gradually replace existing products and provide users with a future-proof solution that complies with current and future regulations, at the same time offering processing and application advantages, reports Henkel. The transition is being driven by increasingly stringent legal requirements — including the European REACH regulation — and growing demands for more sustainable packaging solutions.
As potential endocrine disruptors, phthalates have been the focus of scientific and regulatory attention for years. Certain types such as DEHP, DBP, and BBP have already been classified as toxic to reproduction and are banned in various applications, including toys and cosmetics. The European Commission has also listed several similar substances in the SVHC (substances of very high concern) category. With this in mind, Henkel took the early decision to switch to phthalate-free (NI) formulations.
A key focus of development was the formulation of a one-component sealant system that is suitable for nozzle application, offering stable viscosity, thermal stability, and high resistance to solvents, ketones and oils. Darex COV 73 not only does not contain phthalates, but it also avoids the use of ingredients that are classified as carcinogenic, mutagenic or toxic to reproduction (CMR). According to Henkel, the phthalate-free formulation makes it possible to reduce the curing temperature, thus cutting energy consumption and shrinking the application’s carbon footprint.
Darex COV 73 was successfully developed to market maturity in a pilot project with Emballator. The Swedish manufacturer of metal packaging switched several of its facilities to the new phthalate-free formulation in 2024. In collaboration with Henkel, the company is pursuing a clear sustainability strategy and is proactively addressing regulatory developments such as the REACH regulation by adopting technical solutions at an early stage. Applying Darex COV 73 under real production conditions provided clear evidence for both the smooth application process and effective sealing performance.
Henkel reports that the new Darex COV range is being rolled out gradually to help support its customers in the transition to phthalate-free sealants.
Source: Henkel