reaction mass of N1,N3-bis(3-aminopropyl)-2-methyl-cyclohexane-1,3-diamine and N1,N3-bis(3-aminopropyl)-4-methyl-cyclohexane-1,3-diamine

Endpoint summary

Description of key information

skin corrosion (OECD 435): corrosive category 1B (BASF, 2018)

eye irritation: The study need not be conducted because the substance is classified as corrosive to the skin.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin corrosion: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 435 (In Vitro Membrane Barrier Test Method for Skin Corrosion)

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

Batch identification: Bähr63/Dest/F4-5
pH value: 9.5 (according to safety data sheet)
Physical state / color: Liquid / colorless to yellowish, clear
Storage conditions: Room temperature, avoid temperatures > 30°C, under N2

Test system:

artificial membrane barrier model

Source species:

other: Corrositex® kit

Details on animal used as source of test system:

Corrositex® kit, InVitro International, Irvine CA, USA

Justification for test system used:

The Corrositex® assay is a standardized in vitro corrosion test. The Corrositex® assay kit is commercially available from InVitro International

Vehicle:

unchanged (no vehicle)

Details on test system:

The Corrositex® Biobarrier Membrane is a test system consisting of a reconstituted collagen matrix. The assay is based on the time that the test substance requires to penetrate through the Corrositex® Biobarrier Membrane and produce a change in the Chemical Detection System (CDS).

The Corrositex® assay is used to determine the corrosive potential of test substances. The assay is limited to testing materials which cause detectable pH changes in the CDS .

Amount/concentration applied:

undiluted

Vehicle:

unchanged (no vehicle)

Controls:

yes

Amount / concentration applied:

500 µL of the undiluted test substance were added onto the membrane disc

Duration of treatment / exposure:

one time

Observation period:

The time until a color change was observed was recorded manually and the breakthrough times of the four replicates were used to determine the corrosive potential of the test substance.

The first vial was observed for three minutes for any change in the CDS. If no color change was observed within three minutes, the remaining membranes were treated with the test substance. An electronic time clock was started with each application. The vials were continuously observed for the first ten minutes. Thereafter, the vials were observed for approximately ten minutes around the time points relevant for evaluation or until breakthrough of the test substance occurred

Details on study design:

The experimental design of this study consisted of
- a qualification screen with the CDS (to determine if a color change can be detected)
- a categorization screen (to categorize weak acids/bases and strong acids/bases
- a definitive Corrositex® assay

Corrositex® assay

Following the acceptance of the positive control, the Corrositex® assay was performed for the test substance. Four vials containing the CDS were used for the test substance.

In addition, one vial was used for the PC, the NC and the color control (blank) each.
A membrane disc coated with the biobarrier matrix was placed into one vial containing the CDS and approximately 500 µL test substance were added onto the membrane disc. The vial was observed for three minutes for any change in the CDS.

If no color change was observed within three minutes the membranes remaining were treated with the test substance. The vials were observed continuously for the first ten minutes. Thereafter, the vials were observed for approximately ten minutes around the time points relevant for evaluation or until breakthrough of the test substance. The elapsed time between test substance application and the first change in the indicator solution (i.e. barrier penetration) was recorded.

The positive control vial was prepared as described above and contained one pellet of sodium hydroxide on top of the membrane disc. This vial was continuously monitored until breakthrough.

The negative control vial was prepared as described above and contained 500 µL 10% citric acid. This vial was observed for 60 minutes and was evaluated as “non-corrosive” if no reaction had been observed.

Irritation / corrosion parameter:

penetration time (in minutes)

Value:

56.12

Vehicle controls validity:

not examined

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

PRETEST
Qualification screen: the test substance can react with the CDS and produce a visible color change.

Interpretation of results:

Category 1B (corrosive) based on GHS criteria

Conclusions:

The mean breakthrough time determined in the in vitro membrane barrier test was 56 minutes and 12 seconds.

Executive summary:

Based on the results observed it was concluded that Reaction mass of N1,N3-bis(3-aminopropyl)-2-methyl-cyclohexane-1,3-diamine and N1,N3-bis(3-aminopropyl)-4-methyl-cyclohexane-1,3-diamine

shows a corrosive potential in the Corrositex® - Skin Corrosion Test and should be assigned to UN GHS skin corrosivity subcategory 1B.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (corrosive)

Eye irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Based on the results observed it was concluded that Reaction mass of N1,N3-bis(3-aminopropyl)-2-methyl-cyclohexane-1,3-diamine and N1,N3-bis(3-aminopropyl)-4-methyl-cyclohexane-1,3-diamine shows a corrosive potential in the Corrositex® - Skin Corrosion Test and should be assigned to UN GHS skin corrosivity subcategory 1B.

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008

The available experimental test data are reliable and suitable for classification purposes under Regulation 1272/2008. As a result the substance should be assigned to UN GHS skin corrosivity subcategory 1B.