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Adopted opinions and previous consultations on applications for authorisation

Adopted opinions and previous consultations on applications for authorisation

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. Its decision-making process can be followed through the comitology register, where further information is published about the REACH Committee's past and upcoming meetings.

On 1 February 2020, the United Kingdom (UK) withdrew from the EU. The transition period provided by the withdrawal agreement ended on 31 December 2020. As of 1 January 2021, an application for an authorisation submitted by a person established in the UK (except Northern Ireland) is no longer valid in the EU, unless that application has been transferred to a legal entity established in the EU or Northern Ireland before the end of the transition period. Therefore, authorisation applications and decisions in so far as these concern persons established in the UK (except Northern Ireland) are no longer considered valid. The table below will be updated at a later stage.


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Substance Details

Chromium trioxide
EC Number
CAS Number
Entry Nr in Annex XIV
Use name
Surface treatment (except ETP) for applications in various industry sectors namely architectural, automotive, metal manufacturing and finishing, and general engineering
Broad information on use applied for (conditions of use and function)
This use involves the surface treatment of a metal surface with a water based chromium trioxide containing mixture (e.g. chromic acid) to convert or coat the surface and thereby deliver a barrier film of complex chromium compounds and related on-site formulation.

It is an industrial processes applied in various industry sectors including architectural, automotive, metal manufacturing and finishing, and general engineering, where a water based chromium trioxide containing mixture is typically used in one or more of a series of integrated treatments. Pre-treatment includes processes such as chemical polishing, stripping, deoxidising, pickling and etching of metals. Main treatment includes processes such as conversion coatings, passivation and anodizing, deposition and other surface treatments where a water based chromium trioxide containing mixture is used. Post-treatment includes processes such as rinsing, staining and sealing for final surface protection.

The surface treatment applied for is used to effectively treat articles or components of many different sizes and shapes. The main form of application is dipping or immersion of parts in a bath or through a series of baths containing solutions in closed or open systems.

The water based chromium trioxide containing mixture is sometimes applied by spraying and occasionally, by brush or with a pen-stick, especially to small localised areas.

The concentrations of hexavalent chromium remaining in the surface coating is typically below detection levels, however occasionally hexavalent chrome may be present on purpose.

Machining operations, like fettling, drilling, riveting, edging, abrading, or sanding, might be necessary during industrial post-treatment of coated parts. Therefore, exposure to hexavalent chrome containing dust during these activities is also considered.

The result of the surface treatment process is a barrier film which provides a range of desired properties to the finished article. It protects the metal from corrosion, provides a base for subsequent painting, provides a chemical polish, and/or colours the metal in combination with other important functional characteristics.

Examples of sector specific surface treatment applications include, amongst others, the following:

  • Architectural: building components (envelopes, windows, doors)
  • Automotive: belt locks, bumpers, cylinder heads
  • Packaging: food and beverage cans, twist-off caps and aerosol bottoms and tops (including electrolytic chromium/chromium oxide coated steel (ECCS))
  • General engineering: printed circuit boards, photochemical machining, power transformers
Annual tonnage used: <1,000
Requested review period: 7 years
Use applied for number in application for authorisation
Broad information on use applied for (Use descriptor system)
Sector of end use (SU): SU 0 other: Various sectors including Architecture, Automotive, Food/Non-Food Packaging, General Engineering, Steel Production, Printing, Passivation Copper Foils, Galvanized Steel
Environmental release category (ERC): 6b
Process category (PROC): 1, 2, 4, 5, 7, 8a, 8b, 10, 13, 15, 21, 24, 26
Product category (PC): 14
Article category related to subsequent service life (AC): Not applicable
Technical Function: Ingredient used in surface treatment processes to deliver a barrier film of complex chromium compounds
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
REACHLaw Ltd as Only Representative on behalf of Joint Stock Company “Novotroitsk Plant of Chromium Compounds”
Application type
Commission decided
Other consultations on the same/ similar use
Comments submitted to date
Download comments
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)
2020/C 442/05
Authorisation decision
C(2020)8735 Annex

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