Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 692-840-5 | CAS number: 1345668-40-7
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Link to relevant study record(s)
Description of key information
Raffinates (Fischer-Tropsch), C10-C25-branched hydrocarbon fluids, are poorly absorbed dermally with an estimated overall percutaneous absorption rate of approximately 2ug/cm2/hr or 1% of the total applied fluid. Regardless of exposure route, Raffinates (Fischer-Tropsch), C10-C25-branched hydrocarbon fluids, are rapidly metabolized and eliminated.
Key value for chemical safety assessment
Additional information
There have not been any in vivo dermal absorption studies of Raffinates (Fischer-Tropsch), C10-C25-branched hydrocarbon fluids, but there have been in vitro studies of some constituents, particularly dodecane and hexadecane. Due to the structural similarity of these molecules to Raffinates (Fischer-Tropsch), C10-C25-branched hydrocarbon fluids, it seems reasonable to assume that the solvents would have toxicokinetic properties similar to those of these constituents.
IN VIVO
Ten healthy adult volunteers (five males and five nonpregnant females) with no occupational exposure to jet fuel were recruited for participation. One of the volunteer’s forearms was placed palm up inside the exposure chamber, and two aluminum application wells (10 cm2 per well) were pressed against the skin to prevent JP-8 from spreading during the experiment. Neat JP-8 (1.0 mL) was applied to the volar forearm. The exposure chamber was sealed for the duration of the experiment (0.5 h). At the end of the exposure period, the two exposed skin sites were wiped with a gauze pad and tape-stripped as many as 10 times. Blood samples were drawn from the unexposed arm at baseline, 0.5 h, 1 h, 1.5 h, 2 h, 2.5 h, 3 h, and 3.5 h.
The permeability coefficients (cm/h) of the aliphatic hydrocarbons were determined to be: Decane 6.5E-06, Undecane 4.5E-07, and Dodecane 1.6E-06.
A simple mathematical model based on Fick’s laws of diffusion was used to predict the spatiotemporal variation of undecane and dodecane in the stratum corneum of human volunteers using the same data as above. The estimated values of the diffusion coefficients (Dsc, cm2/min×10E−8 +/- S.D.) were determined to be: undecane, 4.2 +/- 1.2 and Dodecane, 5.0 +/- 0.7.
IN VITRO
Several in vitro studies used porcine skin flaps to determine the absorption and disposition of several aliphatic compounds. There are some general conclusions of the absorption and disposition of C9-C14 aliphatic, < 2% aromatic hydrocarbon fluids. All of the tested chemicals showed a lag time of about 1 h. The retention of aliphatic chemicals in stratum corneum is much higher than epidermis and dermis at all time points. Under infinite dose conditions, the chemicals diffused rapidly into stratum corneum and reached plateau levels within 1 h. The absorption of chemicals in stratum corneum at all time points were in the following order: tetradecane > dodecane > nonane. This shows a linear relationship between the carbon chain length and the absorption of the chemicals in the stratum corneum. The absorption pattern of chemicals in epidermis and dermis, in contrast to stratum corneum, demonstrated a parabolic relationship between the molecular weight of the hydrocarbon and their skin retention.
Dermal absorption values for several of the C9-C14 aliphatic, < 2% aromatic hydrocarbon fluids have been experimentally determined. The permeability coefficients (cm/h) for decane, undecane, and dodecane were determined to be 6.5*10E-6, 4.5*10E-07, and 1.6*10E-06, respectively. In a second experiment, the diffusion coefficient values (cm2/h) of for dodecane (DOD), tridecane (TRI), and tetradecane (TET) were determined to be (0.21 +/-0.02)*10E-6, (6.849 +/- 0.57)*10E-6, (0.209 +/- 0.04)*10E-6, respectively.
Binding to the stratum corneum can be determined by calculating the Log PC (octanol/water) values. There is an increase in binding of the aliphatic JP-8 components with increasing Log PC value. Log PC values are 8.76 +/- 0.74, 13.15 +/- 1.05, 15.85 +/- 1.36 for dodecane (DOD), tridecane (TRI), and tetradecane (TET), respectively.
The flux, JSS (nmol/cm2 per h)*10E-2, values were determined to be 1.94 +/- 0.39, 13.80 +/- 0.82, and 1.40 +/- 0.20 for DOD, TRI, and TET, respectively. The permeability coefficients, Kp (cm/h)*10E-4, were 0.37 +/- 0.13, 18.46 +/- 1.50, 0.64 +/- 0.20 for DOD, TRI, and TET, respectively. The diffusion coefficient values, D (cm/h)*10E-6, were determined to be 0.21 +/- 0.02, 6.84 +/- 0.57, and 0.20 +/- 0.04 for DOD, TRI, TET, respectively. The lag time (hours) was determined to be 1.33 +/- 0.07, 0.89 +/- 0.17, and 1.62 +/- 0.34 hours for DOD, TRI, and TET, respectively. FTIR results suggest that all of the test chemicals significantly (P<0.05) extracted SC lipid and protein in comparison to control. TRI exhibited greater extraction of the SC lipid and protein as well as greater transport through the skin than other chemicals.
The percutaneous absorption and cutaneous disposition of topically applied neat Jet-A, JP-8, and JP-8(100) jet fuels (25 uL/5 cm2) was examined by monitoring the absorptive flux of the marker components 14C naphthalene and 4H dodecane simultaneously applied non-occluded to isolated perfused porcine skin flaps (a = 4). Absorption of 14C hexadecane was estimated from JP-8 fuel. Absorption and disposition of naphthalene and dodecane were also monitored using a nonvolatile JP-8 fraction reflecting exposure to residual fuel that might occur 24 h after a jet fuel spill. In all studies, perfusate, stratum corneum, and skin concentrations were measured over 5 h. Naphthalene absorption had a clear peak absorptive flux at less than 1 h, while dodecane and hexadecane had prolonged, albeit significantly lower, absorption flux profiles. Within JP-8, absorption was (mean +/- SEM; % dose) hexadecane (0.18 +/- 0.08). The area under the curve (AUC) was determined to be (mean +/- SEM; % dose-h/mL): hexadecane (0.0017 +/- 0.0003).
The flux, permeability coefficient (Kp), and binding of hexadecane for porcine skin was determined to be 8.80 +/- 0.00 (nmol/cm2/h) x 10E-3. The permeability coefficient (Kp), and binding of hexadecane for human skin were determined to be 7.02 +/- 0.00 (nmol/cm2/h) x 10E-3. Factor of difference (FOD) in the permeability of pig and human skin was 1.28 for hexadecane. The FOD in binding of hexadecane to pig and human skin was found to be 0.76.
OVERVIEW OF PERCUTANEOUS ABSORPTION OF HYDROCARBON SOLVENTS
There are no studies of repeated dose toxicity of hydrocarbon solvents using the dermal route of administration. Accordingly, where it is necessary to calculate dermal DNELs, systemic data from studies utilizing other routes of administration, normally inhalation but also oral data, can be used in some situations. In accordance with ECHA guidance, read across from oral or inhalation data to dermal should account for differences in absorption where these exist (R8, example B.6). In fact, hydrocarbon solvents are poorly absorbed in most situations, in part because some are volatile and do not remain in contact with the skin for long periods of time and also because, due to their hydrophobic natures, do not partition well into aqueous environments and are poorly absorbed into the blood.
If these differences in relative absorption are introduced into the DNEL calculations to calculate external doses, the DNELs based on systemic effects are highly inflated. This seems potentially misleading as it implies that substances have different intrinsic hazards when encountered by different routes whereas in fact the differences are due ultimately to differences in absorbed dose. Accordingly, it is our opinion that it would be more transparent if the differences in absorption were taken into account in the exposure equations rather than in DNEL derivation.
Shown below is a compilation of percutaneous absorption information for a number of hydrocarbon solvent constituents covering carbon numbers ranging from C5 to C14 as well as examples of both aliphatic and aromatic constituents. The low molecular weight aliphatic hydrocarbons (n-pentane, 2-methylpentane, n-hexane, n-heptane, and n-octane) were tested by Tsuruta (1982) using rat skin in an in vitro model system. As shown (Table 1), the highest percutaneous absorption value was 2 ug/cm2/hr for pentane. Lower values (< ~ 1 ug/cm2/hr) were reported for aliphatic hydrocarbons ranging from hexane to octane. Several authors have assessed the percutaneous absorption of higher molecular weight aliphatic constituents including Baynes et al. (2000), Singh and Singh (2003), Muhammad et al. (2005), and Kim et al., (2006). The first three of these authors used porcine skin models and reported that, except for one anomalous result with tridecane, the percutaneous absorption values for aliphatic constituents ranging from nonane to tetradecane were well below 1 ug/cm2/hr. Rat and human skin are considered to be more permeable than human skin (Kim et al., 2006), so these numbers can be considered conservative.
Kim et al. (2006) reported results of percutaneous absorption studies with human skin under in vivo conditions. In this case, the assessment method was based on tape stripping. The authors reported percutaneous absorption values ranging from 1 – 2 ug/kg/day for decane, undecane and dodecane. These values are higher than those reported by other authors, most likely because this technique measures absorption into the skin but not through the skin as was done in the studies listed above. Accordingly, it seems likely that these numbers are conservative as well.
With respect to aromatic hydrocarbons, most of the reported percutaneous absorption values [Baynes et al. (2000); Singh and Singh (2003); Mohammad et al. (2005); and Kim et al. (2006)] are less than 2 ug/cm2/day. The only exceptions are the values for naphthalene from Mohammad et al. (2005) which range from 4.2-6.6 ug/cm2/hr.
After considering all of the above, it seems reasonable to assume apparent that across the entire range of hydrocarbon solvent constituents, percutaneous absorption values are less than 2 ug/cm2/day. Accordingly, when systemic dermal DNELs are calculated using route to route extrapolations, the values will not be corrected for differences in absorption. Rather, 2 ug/cm2/hr will be used as a common percutaneous absorption rate for all hydrocarbon solvents for which dermal exposure estimates are provided.
Table 1: Summarized information on percutaneous absorption of hydrocarbon solvent constituents (C5-C16).
Constituent |
Molecular Weight |
nmol/min/cm2 |
nmol/hr/cm2 |
ug/cm2/hr |
Reference |
Aliphatic Constituents |
|
|
|
|
|
Pentane |
72 |
0.52 |
31.2 |
2.2 |
Tsuruta et al. 1982 |
|
|
|
|
|
|
2-methyl pentane |
86 |
0.02 |
1.2 |
0.1 |
Tsuruta et al., 1982 |
|
|
|
|
|
|
n-hexane |
86 |
0.02 |
0.6 |
0.5 |
Tsuruta et al., 1982 |
|
|
|
|
|
|
n-heptane |
100 |
0.02 |
1.2 |
0.1 |
Tsuruta et al., 1982 |
|
|
|
|
|
|
n-octane |
114 |
0.08 x 10-3 |
0.005 |
0.0005 |
Tsuruta et al., 1982 |
|
|
|
|
|
|
Nonane |
128 |
|
|
0.03 |
Muhammad et al., 2005 |
Nonane |
|
|
|
0.38 |
McDougal et al., 1999 |
|
|
|
|
|
|
Decane |
142 |
|
|
2 |
Kim et al., 2006 |
Decane |
|
|
|
1.65 |
McDougal et al., 1999 |
|
|
|
|
|
|
Undecane |
156 |
|
|
0.06-0.07 |
Muhammad et al., 2005 |
Undecane |
|
|
|
1.0 |
Kim et al., 2006 |
Undecane |
|
|
|
1.22 |
McDougal et al., 1999 |
|
|
|
|
|
|
Dodecane |
170 |
|
|
0.02-0.04 |
Muhammad et al., 2005 |
Dodecane |
|
|
|
2 |
Kim et al., 2006 |
Dodecane |
|
|
|
0.3 |
Singh and Singh, 2003 |
Dodecane |
|
|
|
0.51 |
McDougal et al., 1999 |
Dodecane |
|
|
|
0.1 |
Baynes et al. 2000 |
|
|
|
|
|
|
Tridecane |
184 |
|
|
0.00-0.02 |
Muhammad et al., 2005 |
Tridecane |
|
|
|
2.5 |
Singh and Singh, 2003 |
Tridecane |
|
|
|
0.33 |
McDougal et al., 1999 |
Tetradecane |
198 |
|
|
0.3 |
Singh and Singh, 2003 |
Hexadecane |
|
|
7.02 x 10E-3 |
0.00004 |
Singh and Singh, 2002 |
|
|
|
|
|
|
Aromatic Constituents |
|
|
|
|
|
Trimethyl benzene |
120 |
|
|
0.49 - 1.01 |
Muhammad et al., 2005 |
Trimethyl benzene |
|
|
|
1.25 |
McDougal et al., 1999 |
|
|
|
|
|
|
Naphthalene |
128 |
|
|
6.6 - 4.2 |
Muhammad et al., 2005 |
Naphthalene |
|
|
|
0.5 |
Kim et al., 2006 |
Naphthalene |
|
|
|
1.4 |
Singh and Singh 2002 |
Naphthalene |
|
|
|
1.8 |
Baynes et al. (2000) |
Naphthalene |
|
|
|
1.0 |
McDougal et al., 1999 |
|
|
|
|
|
|
1 methyl naphthalene |
142 |
|
|
0.5 |
Kim et al., 2006 |
Methyl naphthalene |
|
|
|
1.55 |
McDougal et al., 1999 |
|
|
|
|
|
|
2-methyl naphthalene |
|
|
|
0.5 |
Kim et al., 2006 |
2-methyl naphthalene |
|
|
|
1.1 |
Singh and Singh, 2002 |
|
|
|
|
|
|
|
|
|
|
|
|
Dimethyl naphthalene |
156 |
|
|
0.62 – 0.67 |
Muhammad et al., 2005 |
Dimethyl naphthalene |
|
|
|
0.59 |
McDougal et al. 1999 |
Table 2: Estimated percentages of various hydrocarbon solvent constituents absorbed
Based on the information provided below, an overall estimate of 1% for all hydrocarbon solvents seems reasonable.
Category |
Representative Substance |
Estimate of Percent absorption |
Proposal for category |
Reference for percent value |
|
|
|
|
|
1 |
Trimethyl benzene |
0.2% |
0.2% |
Based on data in Muhammad et al. (2005) |
2 |
Naphthalene |
1.2% |
1.2% |
Riviere et al. 1999 |
3 |
Dodecane (75%) |
0.63% |
0.5% |
Riviere et al., 1999 |
|
TMB (25%) |
0.2% |
|
Muhammad et al., 2005 |
|
|
|
|
|
4 |
Hexadecane (70%) |
0.18% |
0.5% |
Riviere et al., 1999 |
|
Naphthalene (30%) |
1.2% |
|
Riviere et al., 1999 |
|
|
|
|
|
5 |
Pentane |
- |
- |
|
|
|
|
|
|
6 |
Hexane |
- |
- |
|
|
|
|
|
|
7 |
Heptane |
0.14% |
0.14% |
Singh et al. 2003 |
|
|
|
|
|
8 |
Dodecane |
0.63% |
0.63% |
Riviere et al. 1999 |
|
|
|
|
|
9 |
Hexadecane |
0.18% |
0.18% |
Riviere et al., 1999 |
|
|
|
|
|
References
Kim, D., Andersen, M., and Nylander-French (2006). Dermal absorption and penetration of jet fuel components in humans. Toxicology Letters 165:11-21.
McDougal, J., Pollard, D., Weisman, W., Garrett, C., and Miller, T. (2000). Assessment of skin absorption and penetration of JP-8 jet fuel and its components. Toxicological Sciences 25:247-255.
Muhammad, F., N. Monteiro-Riviere, R. Baynes, and J. Riviere (2005). Effect of in vivo jet fuel exposure on subsequent in vitro dermal absorption of individual aromatic and aliphatic hydrocarbon fuel constituents. Journal of Toxicology and Environmental Health Part A. 68:719-737.
Riviere, J., Brooks, J., Monteiro-Riviere, N., Budsaba, K., and Smith, C. (1999). Dermal absorption and distribution of topically dosed jet fuels jet A, JP-8 andJP-8(100). Toxicology and Applied Pharmacology 160:60-75.
Singh, S., Zhao, K., Singh, J. (2002). In vitro permeability and binding of hydrocarbons in pig ear and human abdominal skin. Drug and chemical toxicology, (2002 Feb) Vol. 25, No. 1, pp. 83-92.
Singh, S. and Singh, J. (2003). Percutaneous absorption, biophysical and macroscopic barrier properties of porcine skin exposed to major components of JP-8 jet fuel. Environmental Toxicology and Pharmacology 14:77-85.
Singh, S., Zhao, K., Singh, J. (2003). In vivo percutaneous absorption, skin barrier perturbation and irritation from JP-8 jet fuel components. Drug Chem. Toxicol 26:135-146.
Tsuruta, H. et al. (1982). Percutaneous absorption of organic solvents III. On the penetration rates of hydrophobic solvents through the excised rat skin. Industrial Health 20:335-345.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.