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Verabschiedete Gutachten und bisherige Konsultationen zu Zulassungsanträgen

Verabschiedete Gutachten und bisherige Konsultationen zu Zulassungsanträgen


This page provides further information on the applications for authorisation or review reports, which have undergone consultation. The applications for authorisation are in the opinion development phase until the final opinions of the Committees for Risk Assessment and Socio-economic Analysis have been adopted and sent to the European Commission. The European Commission's decision-making process can be followed through the comitology register, where further information is published about the REACH Committee's past and upcoming meetings.

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Substance Details

Potassium dichromate
EC Number
CAS Number
Entry Nr in Annex XIV
Use name
Use of potassium dichromate for surface treatment of metals such as aluminium, steel, zinc, magnesium, titanium, alloys, composites, sealings of anodic films
Broad information on use applied for (conditions of use and function)
Corrosion resistance is one of the major functionalities of chromates in surface treatment processes.

Key functionalities of potassium dichromate for the main treatment processes (chemical conversion coating, passivation of stainless steel and electroplating) as well as the post-treatment processes (sealing after anodising, chromate rinsing and passivation of metallic coatings) are:
- Corrosion resistance
- Adhesion promotion
- Layer thickness
- Chemical resistance
- Resistivity (electrical contact resistance)
- Hardness (in the electroplating process)

Potassium dichromate -based surface pre-treatments are cleaning, pickling, etching, deoxidising, stripping of inorganic finishes and stripping of organic coatings. The key functionality of potassium dichromate -based surface pre-treatments is removal of surface residues.

The main form of application is dipping or immersion of parts in a tank or through a series of tanks containing solutions in closed or open systems.

Sometimes the solution containing hexavalent chromium is applied by brush or with a pen-stick, especially to small surfaces.

Concentrations of Cr(VI) in the surface coating may be below or above detection levels.

Annual tonnage used: 100 tonnes
Number of sites: >100

Requested review period: 12 years
Use applied for number in application for authorisation
Broad information on use applied for (Use descriptor system)
Sector of end use (SU): 0: other: Aerospace and Aeronautics
Environmental release category (ERC): 6b
Process category (PROC): 1, 2, 4, 5, 7, 8a, 8b, 10, 13, 15, 21, 24
Product category (PC): 14
Technical Function: Corrosion inhibitors and anti-scaling agents
Summary table of RMMs and OCs (non confidential)
Section 9 and 10 of the CSR (original and updated, if available) (non confidential)
Analysis of Alternatives (non confidential report)
Substitution Plan (non confidential summary)
Socio-Economic Analysis (non confidential report)
Joint Analysis of Alternatives and Socio-Economic Analysis (non confidential report)
Explanatory note
Additional information
Brenntag UK Ltd
Application type
Commission decided
Other consultations on the same/ similar use
Comments submitted to date
Download [ZIP]
Response to comments by applicant
Responses to RAC and SEAC requests by Applicant(s) (non confidential)
Compiled RAC and SEAC opinions
Minority positions
Adopted commission decision (OJ summary)
Authorisation decision
C(2020)2073 Annex

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