Welcome to the registrant group for Cetrimonium Bromide (CTAB)

DHI is providing technical services in connection with REACH registration of the above substance.
Contact information:
Anne Rathmann Pedersen, MSC (Chem.Eng.) PhD
[email protected]
+45 4516 9370 (direct)
For Letter of Access (LoA) price and application, please contact us at [email protected] with CC to [email protected].

After signature of the LoA Agreement and receipt of payment for the access, we will provide the token for the joint registration.


Phil Stafford
International Sales Manager for US and Europe

Phone: +45 2429 4174

SDS and Identified usesDownload pdf

SIP – Boundary composition for cetrimonium bromide, EINECS no. 200-311-3

Name and identifier, molecular and structural information

Chemical name Cetrimonium bromide
IUPAC name N,N,N-trimethylhexadecan-1-aminium bromide
EINECS number 200-311-3
CAS number 57-09-0
Synomyms Hexadecyltrimethylammonium bromide
Cetyl trimethyl ammonium bromide
1-Hexadecanaminium, N,N,N-trimethyl-, bromide
Molecular and structural formula C19H42N.Br
InChl InChI=1/C19H42N.BrH/c1-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(2,3)4;/h5-19H2,1-4H3;1H/q+1;/p-1
Molecular weight  364.4475


Recommendation for specification
Degree of purity (% w/w) >95
C-Chain distribution (% w/w):
C14 0-3
C16 ≥95
C18 0-3
Free amine (Mwt 270) (% w/w)  0-2
Amine Hydrobromides (Mwt 350) (% w/w) 0-2
 Sulphated ash (% w/w) 0-1
Methyl bromide (% w/w) 0-1

Recommended Analytical Information

For the analytical information to be included in the company specific dossier, it is recommended to have the following analyses done:

Analysis Rationale
Spectral data FT-IR, UV, NMR- MS Identification
Chromatograms GC-MS Purity, quantification (chain length distribution for the starting material)
Supplementary tests recommended Identification test A-E from the current USP/NF Pharmacopoeia General identification and identification of the bromide ion

Cetrimonium bromide, EINECS no. 200-311-3

Background on the registration process 

Novo Nordisk Pharmatech A/S was accepted in the role as lead registrant in 2009.

The roles to be taken in the SIEF were described by CEFIC and it was decided to follow these.

Novo Nordisk Pharmatech’s SIEF, now LOA agreement is based on a CEFIC template and is a bilateral
contractual agreement made between the lead registrant and the individual SIEF members.

Through a SIEF group formed in 2009, Novo Nordisk Pharmatech has ensured the registration of
Cetrimonium bromide. Our external consultant DHI has been managing the preSIEF formation,
aiming to prepare an inventory of the foreseen activity level for each of participants within the SIEF
group and to reach agreement on the sameness of the substance.

Through a questionnaire to all preSIEF members in 2009 the substance identification was decided upon.
Please find substance identification information in the SIP section on this webpage.

In 2010 Novo Nordisk Pharmatech took steps to planning a SIEF meeting to ensure data availability survey
between SIEF members before registration of the substance, however, no other SIEF members showed interest.

In 2013 Novo Nordisk Pharmatech informed all preSIEF members about the approaching registration deadline
and invited preSIEF members to inform Novo Nordisk Pharmatech about their uses.

The mapping of the identified uses serves as the basis for exposure scenarios to be developed and included in
the registration for this substance. For the identified uses, a risk characterization was carried out in order to
demonstrate that risk to human health and the environment is controlled with the implementation of risk
management measures. The exposure scenarios and the risk characterization is part of the chemical safety
report included in the registration.

Any registrant intending to register this substance in annual volumes above 10 t/yr shall pay attention to the list
of identified uses. The registrant shall be aware of uses, outside the list of identified uses, which must be added to
their own registration.

In 2013 Novo Nordisk Pharmatech prepared the joint submission of the registration dossier for Cetrimonium
bromide in the tonnage band of 100-1000 ton/year and registered before the deadline 30 May 2013. No SIEF
members indicated a need for an earlier registration deadline.

Please pay attention to the list of registered uses attached. Kindly be aware that the number of uses included in
the registration differs from the number of identified uses communicated previously. Any registrant intending to
register the substance in annual volumes above 10 ton/year shall be aware that uses outside the list of registered
uses must be added to own registration.