Skip to Content
Skip to Content

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.

Back to Substance List

Substance Details

Chromium trioxide
EC Number
CAS Number
Entry Nr in Annex XIV
Use name
Industrial use of a mixture of chromium trioxide for the hard chromium plating of military armament steels parts which are thermomechanically stressed and in contact with oxidizing gas at high temperature, so as to ensure a thermal barrier with high melting point, resistance to wear and oxidation associated with weapons as well as resistance to impact and atmospheric corrosion.
Broad information on use applied for (conditions of use and function)
Substance function:

Under Use-1, chromium trioxide is used for hard chromium plating of medium- and large-calibre firearms inner barrels and thermomechanically stressed parts.

The main sought-after functional properties for hard chromium under Use-1 notably include:
- the creation of a thermal barrier with high melting point, so that the temperature of steel does not exceed its tempering temperature
- wear resistance, so as not to degrade the internal surface of the gun barrel during the firing of amunitions
- impact resistance, associated with shooting with high rates of fire
- resistance to atmospheric corrosion
- resistance to oxidising hot gas corrosion, generated by the combustion of the propellant charge.

Key elements of the conditions of use:

- Chromium trioxide is used at one Nexter Mechanics plant (Tulle, France), by 5 workers and for a maximum quantity of 0.5 t/ year (this quantity covers both use 1 and use 2)
- Hard chromium plating is carried out by immersion
- All the steps involving potential exposure to chromium trioxide are covered by a unique exposure scenario
- Given its applications in the surface treatment of armament systems parts and components, Use-1 is critical for a large number of Nexter armament systems portfolio. The parts concerned by use 1 include: Inner weapon barrels, Muzzle brake, CAESAR’s mushroom, Decompressors, CAESAR’s rear split rings, Sealing rings, Unit housing body, Brake rings.
- The functional properties obtained with hard chromium are necessary to comply with requirements of the French national competent authorities, defined according to the expression of needs of the army; they are directly related to the severe conditions of use of the armament systems and the strong thermomechanical stresses associated with the firing of projectiles. Such functional requirements performances are key to the delivery of a constant shooting accuracy and reliability during their engagement on battlefields.

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): 17
Environmental release category (ERC): 5
Process category (PROC): 8a, 10, 13, 15
Product category (PC): 14
Article category related to subsequent service life (AC): No
Technical Function: Corrosion inhibitors and anti-scaling agents, plating agents and metal surface treating 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
Nexter Mechanics
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

Categories Display

Tagged as:

(click the tag to search for relevant content)

Route: .live2