The term per- and polyfluorinated alkyl compounds (PFAS) covers several thousand chemical compounds that pose a risk to living organisms and the environment due to their longevity. For this reason, a draft ban was published some time ago for this group of substances, also known as perpetuity chemicals, which is currently still being evaluated by the ECHA. Irrespective of the pending test result, we are of course taking a comprehensive look at our processes and are always trying to make them more sustainable and to avoid being affected by impending bans. Specifically, in this case we are looking at an alternative sealing process, as the substances PTFE and PFA used to date may be affected by a ban.

With our new process variant of the hard anodized coatings HART-COAT®, HART-COAT®-GL, NUCOTEC® und NUCOCOMP®, a subsequent sealing is applied in order to specifically create additional functional properties. In contrast to our HC-Plus, HC-Plus 2 and EloXseal variants, this new sealant does not require any perfluorinated or polyfluorinated alkyl compounds – making it 100% PFAS-free – and at the same time offers further advantages compared to the previous solution.

PFAS Free HC-SIL

advantages of HART-COAT®-SIL / HART-COAT®-GL-SIL / NUCOTEC®-SIL / NUCOCOMP®-SIL

  • Improvement of the sliding properties
  • Increased hydrophobic properties (water-repellent)
  • High corrosion resistance
  • Improved chemical resistance

layer properties

“The transparent sealant applied by dipping consists of an organic polymer with inorganic silane groups. The result is an adhesive layer that further improves the performance of our hard anodized coatings in terms of their basic properties and leads to a demonstrable reduction in the coefficient of friction,” says Dr.-Ing. Georg Andersohn (reasearch & development manager at Aalberts surface technologies).

The already very good corrosion resistance of the respective base layers HART-COAT®, HART-COAT®-GL, NUCOTEC® und NUCOCOMP® in artificial atmospheres is also improved by the additional sealing. The focus of the application is on sealing the hard anodized layers, but in principle other metallic materials and sub-layers can also be sealed.

The feasibility and the achievable coating properties must be evaluated individually, please contact us for further information and samples! You can find our datasheet here: Datasheet SIL for sealing hard anodic coatings

any questions?

research and development manager

Dr.-Ing. Georg Andersohn
research and development manager

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