1,3,3-trimethyl-N-(2-methylpropylidene)-5-[(2-methylpropylidene)amino]cyclohexanemethylamine

Endpoint summary

Description of key information

The test substance showed corrosive effects on the skin of male and female rabbits. For skin corrosive substances it is assumed that the substance will also cause severe damages of the eyes. However, in a in vivo study on eye irritation (Hüls 1985) the test substance, tested with one undiluted administration of 0,1 m3 to eyes or eyelid sac of male and female rabbits showed slightly irritating effects (OECD 405, 1981).

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Reference 1

Endpoint:

skin irritation: in vitro / ex vivo

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

an in vitro skin irritation study does not need to be conducted because adequate data from an in vivo skin irritation study are available

Reference 2

Endpoint:

skin corrosion: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-01-18 to 2016-01-19

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)

Version / remarks:

July 28, 2015, adopted

Qualifier:

according to guideline

Guideline:

other: ICCVAM Minimum Performance Standards: In Vitro Membrane Barrier Test Systems for Skin Corrosion, June 23, 2003

Qualifier:

according to guideline

Guideline:

other: ICCVAM Recommended Performance Standards for in vitro Test Methods for Skin Corrosion (May 2004)

GLP compliance:

yes (incl. QA statement)

Species:

other: in vitro

Details on test animals or test system and environmental conditions:

Test Kit
Name: Corrositex™
Supplier: Transia GmbH, 35510 Butzbach, Germany
Lot No.: CT120314

Vehicle:

unchanged (no vehicle)

Amount / concentration applied:

- Test item: 500 μL of the neat test item were dispensed directly atop the bio-barrier.
- Positive control: Sulfuric acid (95-97%) was used as positive control. 500 μL were applied to only one bio-barrier.
- Negative control: Citric acid (10% (w/v) solution in deionised water) was used as negative control. 500 μL were applied to only one bio-barrier.
- Reference Item: 10% acetic acid (v/v) will be used as reference item. 500 μL were applied to four bio-barriers.

Duration of treatment / exposure:

Time until observable change in CDS solution: 0 - 240 min
As result from the categorisation test, the test item were applied per bio-barrier for 1 hour

Observation period:

1 hour

Details on study design:

Preparation of the Bio-barrier
- One day prior to testing the bio-barrier matrix was prepared.
- The bio-barrier powder was solved in the bio-barrier diluent and heated for 20 ± 2 minutes at 68 – 70 °C in a water bath under continuous stirring.
- The temperature did not exceed 70 °C. The mixture was allowed to cool in the turned-off water bath for another 10 minutes.
- The mixture was then filled into the membrane holders (200 μL per membrane holder). Air bubbles were avoided.
- The filled membrane holders were sealed with parafilm and were stored at 2 – 8 °C until further use.
Qualify Test
- In order to test whether the test system is suitable for the test item and reference item, 150 μL of the test item were applied into the
“Qualify Test Vial”. The vial was shaken until the solution appeared homogenous, and incubated for 1 minute. Afterwards, a change in consistency
was noted.
Categorisation Test
- In the categorisation test the observation period of the test item and reference item after application to the bio-barrier was determined:
• Category 1: observation period after application will be 4 hours
• Category 2: observation period after application will be 1 hour
- Approximately 150 μL of the test item were applied into the “Category A Vial” as well as into the “Category B Vial”. The vials were shaken until the
solution appeared homogenous. After 1 minute no colour change was monitored.
- Based on the colour change obtained, a test item is assigned to a category. If an intense colour change (similar to the category 1 colour chart) is
observed in “Category A Vial” or in “Category B Vial” the test item is assigned to category 1. If a less intense colour change (similar to the category 2 colour chart) is observed in “Category A Vial” or in “Category B Vial” the test item will be assigned to category 2. If no colour change is observed in
either of the vials, a confirmation test is conducted. For the confirmation test two drops of the confirm reagent are added to the “Category B Vial”.
The vial was shaken for 5 seconds. The colour of the solution matched one of the colours shown in the accompanying colour chart, confirming that
the test item is a category 2 substance.
Classification Test
- 11 vials containing the CDS were pre-warmed to room temperature.
- 4 vials each were used for quadruplicate measurement of the test item and reference item, the vial labelled (+) was used for the positive control
(single measurement), and the vial labelled (-) was used for the negative control (single measurement).
- The vial labelled C was used as colour reference for the CDS.
- Applications of the test item, reference item and the controls were performed staggered to ensure accurate reaction times to be recorded.
- The prepared bio-barriers were placed atop the CDS vials (not longer than 2 min prior to application) and 500 μL of the test item or controls,
respectively, were applied per bio-barrier for 1 hour was a result from the categorisation test.
- The time interval of the possible colour change or precipitation in the CDS solution was recorded in the raw data file.

Irritation / corrosion parameter:

other: Colour change

Value:

> 60

Vehicle controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

RESULTS AND DISCUSSION

Qualify Test (Test Item)

The test item induced a physical change (precipitation) in the qualify test after 1 minute incubation. Since a physical change (precipitation) was visible in the “Qualify Test Vial”, the test item was considered to be suitable for the next step.

Qualify Test (Reference Item)

The reference item induced a change in colour in the qualify test after 1 minute incubation. Since a change in colour was visible in the “Qualify Test Vial”, the test item was considered to be suitable for the next step.

Categorisation Test (Test Item)

The test item did not induce a change in colour neither Category A vial nor in the Category B vial after 1 minute incubation. A confirmation experiment was performed by adding the confirm reagent to the Category B vial. This induced a change in colour to grey. Therefore, the test item was classified as category 2.

Categorisation Test (Reference Item)

The reference item did not induce a change in colour neither Category A vial nor in the Category B vial after 1 minute incubation. A confirmation experiment was performed by adding the confirm reagent to the Category B vial. This induced a change in colour to yellow. Therefore, the test item was classified as category II.

Classification Test

Test Group	Time Interval of Color Change	UN GHS Prediction
Negative Control	> 60 minutes	Non-corrosive
Positive Control	53 seconds	Corrosive Sub-category 1A
Reference Item	> 30 – 60 minutes	Corrosive Sub-category1C
Test Item	> 60 minutes	Non corrosive

Discussion

According to Sponsor’s information there is an animal study available with test substance. Based on this study results test item has to be classified as corrosive. The design of this study could not distinguish between subcategories 1B and 1C. Therefore, a reference item, with well-known Category (1C) was determined in addition in the present study.

The test item and the reference item passed the qualify test and were considered as suitable for testing with the Corrositex™ test kit.

In the categorisation test the test item and the reference item did not induce a colour change in the category A or in the category B vial after 1 minute incubation. A confirmation experiment was performed by adding the confirm reagent to the Category B vial. This induced a change in colour after 5 seconds incubation. The test item was classified according to category 2.

500 μl of the test item and the reference item were applied on quadruplicate bio-barriers for the classification test. The bio-barriers were placed atop vials containing the CDS reagent. The time needed to corrode the bio-barrier and induce a distinct change in the colour of the CDS reagent was monitored for each of the vials.

500 μL of the negative control (10% citric acid) were placed atop one bio-barrier and the colour change of the CDS reagent was monitored up to 60 minutes.

500 μL of the positive control (Sulfuric acid 95-97%) was placed atop one bio-barrier and the colour change of the CDS reagent was monitored.

The negative control did not induce a change in the colour of the CDS reagent after 60 minutes. The positive control showed a distinct change in the colour of the CDS reagent in the time interval of 0 – 3 minutes. These results ensured the validity of the test.

A change of colour of the CDS reagent after treatment of the bio-barriers with the test item could not be observed after 60 minutes. According to the classification criteria given in "overall remarks" the test item was classified as Non Corrosive.

A change of colour of the CDS reagent after treatment of the bio-barriers with the reference item could be observed in the interval from 30 to 60 minutes. According to the classification criteria given in "overall remarks"

the reference item was classified as corrosive (GHS Cat 1C).

Conclusions:

In conclusion, it can be stated that in this study and under the experimental conditions reported, the test item is not corrosive to skin.

Executive summary:

This in vitro study was performed to assess the corrosive potential of test item by means of the in vitro Membrane Barrier Test for

Skin Corrosion (OECD TG 435) using the Corrositex™ test kit.

Following an initial determination of the compatibility of the test item with the test system (qualify test) and a test system-specific categorisation (categorisation test), 500 μL of the test item were applied on quadruplicate bio-barriers for the classification test. The

bio-barriers were placed atop vials containing the chemical detection system (CDS). The time needed to corrode the bio-barrier and to induce a distinct change in the colour of the CDS reagent was monitored for each of the vials.

Additionally to the test item a reference item was tested.

No change of colour of the CDS reagent after treatment of the bio-barriers with the test item was observed after the 60 minutes time interval.

A change of colour of the CDS reagent after treatment of the bio-barriers with the reference item could be observed in the interval from 30 to 60 minutes.

The test item as well as the negative and the positive controls fulfilled the acceptance criteria for the test system.

According to the classification criteria given in "overall remarks" the test item was, therefore, classified as not corrosive.

The reference item was classified as corrosive (UN GHS subcategory 1C or C; Reg. (EC) No. 1272/2008).

In conclusion, it can be stated that in this study and under the experimental conditions reported, the test item is not corrosive to skin.

Reference 3

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1985-05-29 to 1985-06-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

(1981)

Deviations:

no

GLP compliance:

no

Species:

rabbit

Strain:

other: Small white Russian, Chbb-SPF

Details on test animals or test system and environmental conditions:

- Source: Dr. Karl Thomae GmbH, Biberach (Germany)
- Sex: male and female
- Weight at study initiation: 2.2 - 2.6 kg

Type of coverage:

occlusive

Preparation of test site:

not specified

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

0.5 ml

Duration of treatment / exposure:

4 hour

Observation period:

- Examination time points: 1, 24, 48, 72 hours, 5, 7, 9, 12, and 14 days  after patch removal; evaluation based on readings 1-4

Number of animals:

6 (3 males, 3 females)

Details on study design:

ADMINISTRATION/EXPOSURE 
- Area of exposure: 6 cm2
- Occlusion: mull patch, polyethylene film, elastic dressing
- Removal of test substance: washing with warm water
- Post exposure period: 14 days

Irritation parameter:

primary dermal irritation index (PDII)

Time point:

other: 1, 24, 48, and 72 hours

Score:

6.21

Irritant / corrosive response data:

AVERAGE SCORE
- Erythema: 4.0
- Edema: 2.2
- necroses: within 4 hours, not within 3 minutes
REVERSIBILITY: not reversible

Other effects:

general sequence: reddish brown, sometimes green  discoloration with white flecks on part of the application area (1-72  hours); induration (24-72 hours); eschar formation, partly detaching  (days 5-14), formation of scars (end of study)

Conclusions:

The substance crosslinking agent
1,3,3 -trimethyl-N-(2 -methylpropylidene)-5 -[(2 -methylpropylidene)amino]cyclohexanemethylamine, tested with one undiluted application of 0,5 cm3 was corrosive to the skin of male and female rabbits (OECD 404, 1981).

Executive summary:

The test substance tested with one undiluted application of 0,5 cm³was corrosive to the skin of male and female rabbits (OECD 404, 1981).

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (corrosive)

Eye irritation

Link to relevant study records

Reference

Reference 1

Endpoint:

eye irritation: in vitro / ex vivo

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

an in vitro eye irritation study does not need to be conducted because adequate data from an in vivo eye irritation study are available

Reference 2

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1985-05-29 to 1985-06-10

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

(1981)

Deviations:

no

GLP compliance:

no

Species:

rabbit

Strain:

other: Small white Russian, Chbb-SPF

Details on test animals or tissues and environmental conditions:

- Source: Dr. Karl Thomae GmbH, Biberach (Germany)
- Sex: male and female
- Weight at study initiation: 2.0 - 2.6 kg
- Number of animals: 3 males, 3 females
- Controls: untreated eye

Vehicle:

unchanged (no vehicle)

Amount / concentration applied:

undiluted
Amount applied: 0.1 ml

Duration of treatment / exposure:

72 hour(s)

Observation period (in vivo):

Postexposure observation period: 12 days

Number of animals or in vitro replicates:

6

Details on study design:

Comment: rinsed after (see exposure time)
EXAMINATIONS
- Ophtalmoscopic examination: 1, 24, 48, 72 hours, 5, 7, 9, and 12 days  after treatment
- Tool used to assess score: sodium fluorescein / ophthalmic lamp /  visual inspections
- Scoring system: Draize (1959); evaluation: VCI notes on safety data  sheet and Appendix VI of 79/831/EEC

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

other: according to scoring system

Score:

18.21

Max. score:

110

Reversibility:

fully reversible within: 12 days

Remarks on result:

other: REVERSIBILITY: complete in 12 days except for alopecia on the margin of  the lower eyelid of one animal

Irritant / corrosive response data:

AVERAGE SCORE
- Cornea: 0.72
- Iris: 0.33
- Conjunctivae (Redness): 2.06
- Conjunctivae (Chemosis): 0.61
- Overall irritation score: 18.21/110
DESCRIPTION OF LESIONS: transient reddening of parts of the iris in the  females
REVERSIBILITY: complete in 12 days except for alopecia on the margin of  the lower eyelid of one animal

Conclusions:

The crosslinking agent
1,3,3 -trimethyl-N-(2 -methylpropylidene)-5 -[(2 -methylpropylidene)amino]cyclohexanemethylamine
(VESTAMIN A 139), tested with one undiluted administration of 0,1 m3 to eyes or eyelid sac of male and female rabbits showed slightly irritating effects (OECD 405, 1981).

Executive summary:

The test substance tested with one undiluted administration of 0,1 m³to eyes or eyelid sac of male and female rabbits showed slightly irritating effects (OECD 405, 1981).

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

The test substance tested with one undiluted application of 0,5 cm³ was strongly irritating to the skin of male and female rabbits (OECD 404, 1981).

 In a study on eye irritation the test substance tested with one undiluted administration of 0,1 m³ to eyes or eyelid sac of male and female rabbits showed only slightly irritating effects (OECD 405, 1981).

Justification for classification or non-classification

According to criteria of EC Regulation 1272/2008, the test substance is corrosive to skin (Skin Corr. 1 C) and slightly irritating to the eyes (Eye Irrit. 2).