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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. 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

Chromium trioxide
EC Number
CAS Number
Entry Nr in Annex XIV
Use name
The use of chromium trioxide for a pre-treatment step (etching) in the electroplating process
Broad information on use applied for (conditions of use and function)
Hansgrohe SE uses solid chromium trioxide for the pre-treatment (etching) of plastic parts before they are coated by electroplating. Plastic substrates are electrical insulators, meaning that they cannot be electroplated under normal conditions, therefore they have to be etched to make electroplating possible. Freshly molded plastic parts are etched with chromic acid by dipping the parts into a heated bath (ca. 60°C). This etching step is a prerequisite to achieve acceptable lifetimes of coated articles for manual handling (sanitary objects, e.g. shower heads).

The short process time allows the synchronization of the process with the plating steps. The process is integrated into the plating line which avoids handling and prevents any contamination of the etched surface, which would deteriorate the subsequent plating layers.

As a wet chemical dipping process the chromic acid etching exhibits similar risks as the plating process itself. Therefore, the same risk management measures can be applied for both processes.

Substance function: Chromic acid, being a strong oxidizer for any organic matter, etches the plastic and gives a characteristic roughness and a chemically modified surface which improve the adhesive strength of the coatings. The unique surface roughness and the chemical modification result in a high bonding strength between the metal coating and the plastic surface. This allows very durable and robust metal layers for the use of sanitary installations in home and industry.

Annual tonnage used: <20 tonnes of chromium trioxide

Review period requested: 12 years
Use applied for number in application for authorisation
Broad information on use applied for (Use descriptor system)
Sector of end use (SU): 3
Environmental release category (ERC): 6b
Process category (PROC): 2, 8b, 15
Product category (PC): 14
Article category related to subsequent service life (AC): n/a
Technical Function: Etching agent, Oxidizing agent
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
Hansgrohe SE
Application type
Commission decided
Other consultations on the same/ similar use
Comments submitted to date
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

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