The European Commission has adopted decisions granting REACH authorisation for certain uses of pentazinc chromate octahydroxide, dichromium tris(chromate) and potassium dichromate.
The first two are identified as SVHCs due to their carcinogenic properties and had a sunset date of 22 January 2019. Potassium dichromate is carcinogenic, mutagenic and reprotoxic (CMR) and had a sunset date of 21 September 2017.
This month, the EU executive permitted Aviall Services and Finalin the following use of pentazinc chromate octahydroxide:
in wash primers, fuel tank primers and aluminised primers for the purpose of corrosion protection in aeronautic applications where any of the following key functionalities or properties is necessary for the intended use: corrosion resistance, active corrosion inhibition, adhesion, chemical resistance, layer thickness, temperature resistance, compatibility with other substrate/other coatings, dynamic performance (only for fuel tank primer) and appearance (only for aluminised primer).
The Commission also granted both companies authorisation for formulation of mixtures exclusively for these uses.
Additionally it permitted Wesco Aircraft EMEA authorisation for the following use of dichromium tris(chromate):
in chemical conversion coating applications by the aerospace and defence sector where any of the following key functionalities or properties is necessary for the intended use: corrosion resistance, active corrosion inhibition, adhesion promotion, chemical resistance, layer thickness and electrical properties.
The recommended review period for the authorised use, as well as those granted for pentazinc chromate octahydroxide, is 22 January 2026.
And the Commission has permitted Brenntag use of potassium dichromate:
for surface treatment of metals (such as aluminium, steel, zinc, magnesium, titanium, and alloys), composites and sealings of anodic films for the aerospace sector in the surface treatment processes in which any of the key functionalities listed in the Annex is required.
It also granted the company authorisation for the formulation of mixtures exclusively for this use.
The recommended review period is 21 September 2024.
The authorisation list REACH Annex XIV currently contains 54 chemicals. Last month, Echa started consulting on adding a further seven priority substances.
Chemical Watch, 16 April 2020