Registration Dossier

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

The key study for this endpoint is as follows:
Sárvári, Z. (2010). Determination of the melting point of Great Lakes CD-75P. Testing Laboratory: LAB Research Ltd., H-8200 Vesprém, Szabadságpuszta, Hungry. Report no.: 10/113-344AN. Owner Company: Chemtura Corporation, 199 Benson Road, Middlebury, Connecticut 06749, USA. Report date: 2010-05-03.
The following information is presented as supporting information only.
PBT Working Group (2008) ECB Summary Sheet, PBT Working Group, List No. 58, p2, Section 1.2, Table 1.1.
Smith, K., Liu, C.-H., El-Hiti, G.A., Kang, G.S., Jones, E., Clement, S.G., Checquer, A.D., Howarth, O.W., Hursthouse, M.B. & Coles, S.J. (2005) An extensive study of bromination of cis,trans,trans-1,5,9-cyclodedecantriene: product structures and conformations, Org. Biomol. Chem (2005), Vol. 3, pp. 1880-1892.
Barontini, F., Cozzani, V. & Petarca, L. (2001) Thermal stability and decomposition products of Hexabromocyclododecane, Ind. Eng. Chem. Res. (2001) Vol 40, pp.3270-3280.
Peled, M. Scharia, R. & Sondark, D. (1995) Thermal rearrangement of Hexabromo-cyclododecane (HBCD), Industrial Chemistry Library (1995) Vol 7, pp.92-99.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
185.9 °C

Additional information

Sárvári (2010) was conducted in accordance with OECD guideline 102 and EU Method A.1 under GLP conditions using the capillary method. A small amount of the test item was heated in the electronic controlled sample block and the temperature around the sample was displayed. The sample was observed visually while raising the temperature. The initial and final melting temperatures were determined. Using a linear heating rate of 0.5 °C/min the melting point of Great Lakes CD-75P was found to be 185.9 ± 0.04 °C (95 % confidence interval), i.e. 459.0 K.

The following results were reported by the supporting information for the melting point or range of the registered substance:

PBT Working Group (2008):

Melt./Freez. pt.

Remarks

>= 172 — <= 205 °C

overall range for all isomers.

190 °C

average value

179 — 181 °C

for α-HBCDD isomer

170 — 172 °C

for β-HBCDD isomer

207 — 209 °C

for γ-HBCDD isomer

Barontini et al (2001):

Melt./Freez. pt.

Decomposition

Decomp. temp.

Remarks

189 °C

yes

230 °C

Results for HBCDD 1.

Decomposition point above melting point.

182.7 °C

yes

230 °C

Results for HBCDD 2.

Decomposition point above melting point.

Peled et al (1995):

Melt./Freez. pt.

Remarks

198 °C

Result for sample A

196.5 °C

Result for sample B

207 °C

Result for sample B-2

192.2 °C

Result for sample C

195.5 °C

Result for sample D

Melting points of pure isomers of HBCD (Peled et al, 1995):

HBCDD 1 (γ-isomer) = 208 -210

HBCDD 2 (β-isomer) = 169 -170

HBCDD 3 (α-isomer) = 171 -173