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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
dermal absorption in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Non-GLP, non-guideline in-vitro experimental study, published in peer reviewed literature, minor restrictions in reporting but otherwise adequate for assessment.

Data source

Reference
Reference Type:
publication
Title:
In vitro evaluation of the efficacy of skin barrier creams and protective gloves on percutaneous absorption of industrial solvents
Author:
Korinth, G., Geh, S., Schaller, K.H. and Drexler, H
Year:
2003
Bibliographic source:
Int. Arch. Environ. Health, 76, 382-386

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
In an in vitro skin permeability study, the permeation of 1,2,4-trimethylbenzene through human skin was determined using static Franz diffusion cells.
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
1,2,4-trimethylbenzene
EC Number:
202-436-9
EC Name:
1,2,4-trimethylbenzene
Cas Number:
95-63-6
Molecular formula:
C9H12
IUPAC Name:
1,2,4-trimethylbenzene
Details on test material:
- Name of test material (as cited in study report): 1,2,4-trimethylbenzene
- Purity: >99%
- Source; Fluka (Germany)
Radiolabelling:
no

Test animals

Species:
human
Sex:
not specified
Details on test animals or test system and environmental conditions:
Human skin from one donor obtained from a local hospital and stored for approximately 1 week at -20C.

Administration / exposure

Type of coverage:
occlusive
Vehicle:
other: neat TMB, 10 or 50% TMB in ethanol
Duration of exposure:
8h
Doses:
128 µL/0.64cm3

Results and discussion

Absorption in different matrices:
Steady state status had not been attained after 8 h exposure.
64 µg penetrated untreated skin from neat 1,2,4-TMB, 77 µg penetrated from a 50% ethanolic solution of 1,2,4-TMB.
The presence of skin barrier cream enhanced penetration of 1,2,4-TMB from ethanolic solutions.
1,2,4-TMB was detected in the receptor fluid within 30 min of application to glove material.
Percutaneous absorption
Dose:
128 µl/0.64cm2
Parameter:
percentage
Absorption:
ca. 0.1 %
Remarks on result:
other: 8 h
Remarks:
value calculated by reviewer = 0.057% (not reported in original publication)

Applicant's summary and conclusion

Executive summary:

Steady state status had not been attained after 8 h exposure.

64 µg (0.057%) penetrated human skin when 1,2,4-TMB was applied at a rate of 128 µL/0.64 cm2.