Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
The registration substance 'Paraffin waxes (Fischer-Tropsch), isomerization' is a white solid at standard temperature and pressure.
Given its complex and variable composition and depending on the product grade, this mixture of linear and branched aliphatic hydrocarbons has a measured pour point range of 78 to 90°C (ASTM D97) and a measured boiling range of 375 to >700°C (ASTM D7169). The measured relative density is 0.84 to 0.85 at 15°C (ASTM 4052 and ASTM D1250 table 53A) and the viscosity ranges from about 18 to 21 mm2/s at 100°C mm2/s. The substance has a measured flashpoint of >239°C (ASTM D93, closed cup), a measured autoignition temperature of 422°C (EU Method A.15) and a measured vapour pressure of 1.7 Pa at 20°C (EU Method A.4).
Measured (whole-substance) water solubility and partition coefficient are not available for the registration substance; instead, data of the closely related substance GTL waxy raffinate [C15-50; CAS 848301-87-1, EC 482-130-1] are used, covering the low molecular weight fraction of the registration substance up to C50:
- water solubility: 3.1 mg TOC/L at 20.0±0.5°C (EU Method A.6);
- partition coefficient: log Kow >6.5 at 40 °C and pH7 (EU Method A.8).
The use of these data for the registration substance is considered justified on the basis of the following conclusions:
- water solubility: as the water solubility decreases with increasing carbon chain length, it can be safely concluded that the corresponding result for the (solid) registration substance containing higher molecular weight constituents (C25 - C150, about 30-55% >C50) should be << 3.1 mg TOC/L at 20.0 ± 0.5°C; as key result, a water solubility of approx. 1 mg TOC/L (rather < 1 mg TOC/L) is applied for the registration substance, which is supported by a test result for the closely related (liquid) substance GTL base oil (CAS 848301-69-9, EC 482-220-0), consisting of linear and branched alkanes (paraffins) with a small amount of cycloalkanes in the carbon range from C18 to C50;
- partition coefficient: due to the general trend of decreasing water solubility with increasing carbon chain length/molecule size and the fact that the experimentally determined value for GTL waxy raffinate is based on the highest calibration standard [DDT, limit value of 6.5], it can be safely concluded that the result for the registration substance containing higher molecular weight constituents (C25 - C150, about 30-55 % >C50) would be the same: 3.16 x 106, log10 KOW >6.50.
For the endpoints vapour pressure, water solubility and partition coefficient, predicted property data for relevant constituents were obtained as described in the endpoint study records.
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