Ethane, 1,2-dichloro-1-[difluoro(trifluoromethoxy)methoxy]-1,2,2-trifluoro-

Endpoint summary

Description of key information

One acute toxicity study by oral route is available. The study was conducted according to OECD guideline 423 and in compliance with Good Laboratory Practice (GLP) criteria.

The LD50 (rat) was higher than 2000 mg/kg bw, moreover no significant toxic effect following oral administration of a single dose of 2000 mg/kg bw was observed.

No acute toxicity study by dermal route or by inhalation are available for MOVE 3 Adduct.

An estimation of the potential for acute dermal toxicity is done on the basis of the data available from acute oral toxicity and on considerations of dermal absorption potential.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

31-JAN-2007 to 12-JUN-2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Deviations:

no

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

yes

Specific details on test material used for the study:

ACUTE ORAL TOXICITY STUDY
- Name of test material (as cited in study report): Addotto MOVE 3
- Substance type: monoconstituent 
- Physical state: colourless clear free-flowing liquid
- Analytical purity, impurities, purity test date: no data available
- Lot/batch No.: DIST.05/06
- Expiration date of the lot/batch: 31-DEC-2010
- Storage condition of test material: ambient condition

Species:

rat

Strain:

Sprague-Dawley

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Italy S.r.l. / 33049 San Pietro al Natisone (UD) / ITALY
- Age at study initiation: 6 to 8 weeks
- Weight at study initiation: 176 to 200 g; the body weight of each individual was within 20% of the mean of the group.
- Fasting period before study: overnight fast prior to dosing and a period of approximately 4 hrs after dosing
- Housing: in groups of 3 animals, in polycarbonate cages (59 x 38.5 x 20 cm) with stainless steel mesh lid and floor
- Diet: ad libitum, commercial laboratory rodent diet (4 RF 18, Mucedola S.r.l. / 20019 Settimo Milanese (MI) / ITALY)
- Water: ad libitum, drinking water
- Acclimation period: at least 5 days before the start of the test

ENVIRONMENTAL CONDITIONS
- Temperature: 22 ± 2°C
- Humidity: 55 ± 15%
- Air changes: 15 to 20 air changes per hour
- Photoperiod: 12 hrs dark / 12 hrs light

IN-LIFE DATES: From 26-JAN-2007 to 06-MAR-2007

Route of administration:

oral: gavage

Vehicle:

CMC (carboxymethyl cellulose)

Remarks:

as 0.5% aqueous solution

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 200 mg/mL
- Amount of vehicle: 10 mL/kg
- Justification for choice of vehicle, lot/batch no., purity: no data available

MAXIMUM DOSE VOLUME APPLIED: 10 mL/kg

CLASS METHOD
- Rationale for the selection of the starting dose: a single group of 3 female animals was dosed at a level of 2000 mg/kg (step 1). No mortality occurred and three additional females were subsequently dosed at the same dose level (step 2).

Doses:

2000 mg/kg

No. of animals per sex per dose:

3 per group (2 groups treated, for a total of 6 animals per dose)

Control animals:

no

Details on study design:

A single group of 3 female animals was dosed first. At the end of the observation period, an additional group was treated at the same dose level.

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: throughout the study all animals were checked twice daily for mortality and morbidity. Animals were observed for clinical signs immediately upon dosing, approximately 30 min, 2 and 4 hrs after dosing and daily thereafter for a total of 14 days. All animals were weighed at allocation to the study (day -1), immediately prior to dosing (day 1) and on days 2, 8 and 15.
- Necropsy of survivors performed: yes; all animals were killed on day 15 by carbon dioxide narcosis. Animals were subjected to a gross necropsy examination for both external and internal abnormalities. The cranial, thoracic and abnormal cavities were opened to allow examination of their contents. Larger organs were sectioned. Both the stomach and representative sections of the gastro-intestinal tract were opened for examination of the mucosal surfaces.

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No death occurred following dosing at 2000 mg/kg in each group of female animals (steps 1 and 2).

Clinical signs:

other: The only significant clinical sign observed in the first group of animals treated with 2000 mg/kg (step 1) was the presence of soft faeces in the cage tray on Day 2. Recovery from this sign occurred by Day 3. Hair loss of the dorsum was detected in 1/3 fe

Gross pathology:

No abnormalities were observed in any animal at the necropsy examination performed at termination of the study.

Table 1: Body weight and body weight changes (g) - mean data

		Day -1 (pre-test phase)	Day 1 (dosing phase)	Day 2	Day 8	Day 15
Step 1	Mean body weight	219.0	203.7	218.0	233.0	240.3
	Standard deviation (SD)	5.3	3.2	2.0	5.0	7.2
	Mean body weight change	-	-	+14.3	+29.3	+36.7
	SD	-	-	3.1	2.3	4.2
Step 2	Mean body weight	230.3	213.7	230.7	239.3	246.0
	SD	9.1	11.2	11.0	12.9	13.9
	Mean body weight change	-	-	+17.0	+25.7	+32.3
	SD	-	-	3.0	2.1	3.1

Interpretation of results:

GHS criteria not met

Conclusions:

In conclusion, these results indicated that the test item had no significant toxic effect on the rat following oral administration of a single dose at a level of 2000 mg/kg. The lack of mortality demonstrated the LD50 to be greater than 2000 mg/kg body weight.

Executive summary:

The acute toxicity of the test item was investigated after oral administration (10 mL/kg in 0.5% aqueous solution of carboxymethyl cellulose) of a single dose to fasted Sprague-Dawley rats, followed by a 14-day observation. The method was in accordance with EU method B.1 tris and OECD guideline 423 and in compliance with good laboratory practices (GLP).

A single group of 3 female animals was dosed at a level of 2000 mg/kg and observed for a period of 14 days (step 1). No mortality occurred. The only significant clinical sign observed in the first group of animals treated at 2000 mg/kg (step 1) was the presence of soft faeces in the cage tray on Day 2. Recovery was completed by Day 3.

Three additional female animals were then dosed at the same dose level (2000 mg/kg) and observed for a period of 14 days (step 2). No mortality occurred. Piloerection was observed in the 3 animals approximately 2 hours after dosing. Presence of soft faeces in the cage tray was recorded on Day 2. Recovery was completed by Day 3.

Changes in body weight were within the expected range for this strain and age of animals. Animals were killed at the end of the observation period and were subjected to necropsy examination. No abnormalities were observed at necropsy examination at termination of the study.

These results indicated that the test item had no significant toxic effect on the rat following oral administration of a single dose at a level of 2000 mg/kg. The lack of mortality demonstrated the LD50 to be greater than 2000 mg/kg body weight. Therefore, the test material does not meet the classification criteria of EC Regulation No. 1272/2008 (CLP / EU GHS) and UN GHS for acute toxicity.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

discriminating dose

Value:

2 000 mg/kg bw

Quality of whole database:

One acute toxicity study by oral route is available, having high reliability (Guideline study conducted under GLP).

Additional information

Assessment of Acute Dermal Toxicity Potential

No Acute Toxicity study by Dermal route are available for MOVE 3 Adduct therefore an estimation of the potential for acute dermal toxicity is done on the basis of the data available from acute oral toxicity and on considerations of dermal absorption potential.

Systemic toxic effect due to dermal exposure is related both to the systemic toxicity of the substance and to the capacity of the substance to be absorbed at systemic level following dermal exposure.

As described in theECHA Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7.a_v.3.0, a potential for acute dermal toxicity is expected when systemic toxicity is observed in an acute oral toxicity test and there is potential for high dermal absorption.

 

MOVE 3 Adduct was tested for its acute toxicity by oral route resulting in no significant toxic effect when administered to rat at the single dose of 2000 mg/kg bw.

Moreover the dermal absorption potential of MOVE 3 Adduct can be estimated on the basis of the physical-chemical properties.

Dermal absorption represents the amount of topically applied test substance that is found in the epidermis (stratum corneum excluded) and in the dermis, and this quantity is therefore taken as systemically available. As described in the ECHA Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7.c_v.2.0, the following parameters can be considered for assessing the skin absorption potential:

Physical state, molecular weight, structure, water solubility, Log Kow, Vapor pressure, Surface tension, Skin Irritation/Corrosion data and other animal study involving dermal administration, presence of cationic trace elements.

 

MOVE 3 Adduct has a molecular weight of 302.94, it is a high volatile liquid (Vapor pressure of 17000 Pa at 25°C) with a low water solubility (ws = 0.84 mg/L), lipophilicity (log Kow = 4.4), no surface tension properties and it does not contain any cationic trace element.

Moreover it was tested in anin-vitrosystem for skin irritation resulting not-irritant to the skin.

As reported in ECHA Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7.c_v.2.0_Table R.7.12-3 liquids are taken up more readily than dry particulates but absorption of volatile liquids across the skin may be limited by the rate at which the liquid evaporates off the skin surface.

Molecular weight less than 100 favors dermal uptake. Above 500 the molecule may be too large.

If the water solubility is below 1 mg/l, dermal uptake is likely to be low.

For substances with log Kow above 4, the rate of penetration may be limited by the rate of transfer between the stratum corneum and the epidermis, but uptake into the stratum corneum will be high.

Anyway although a substance may readily partition into the stratum corneum, it may be too volatile to penetrate further. This can be the case for substances with vapor pressures above 100-10,000 Pa at 25°C.

 

Therefore, basing on its physical-chemical properties, a significant rate of absorption through the skin is not anticipated for MOVE 3 Adduct.

 

Considering the lack of acute toxicity by oral route and that there is no potential for significant dermal absorption, acute toxicity by dermal route is not expected for MOVE 3 Adduct.

Justification for classification or non-classification

The lack of mortality in the Acute toxicity study by Oral route demonstrated the LD50 (oral) to be greater than 2000 mg /kg bw, moreover, because of the lack of significant toxic effects there is no evidence that the substance may have LD50 in the range 2000 - 5000 mg/kg bw.

Therefore, MOVE 3 Adduct does not meet the classification criteria for the Acute Oral Toxicity hazard class according to EC Regulation No.1272/2008 (CLP/EUGHS) and UN GHS.

Due to lack of toxicity by oral route, and considering that the physicochemical properties of MOVE 3 Adduct suggest no potential for a significant rate of absorption through the skin (MW = 302.94, water solubility < 1 mg/L, log Kow > 4, Vapor Pressure at 25°C > 10000 Pa; Ref: ECHA Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7.c_v.2.0_ Table R.7.12—3) toxicity by dermal route is not anticipated.

Therefore, MOVE3 Adduct does not meet the classification criteria for Acute Dermal Toxicity hazard class according to EC Regulation No.1272/2008 (CLP/EUGHS) and UN GHS.