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Toxicological information

Acute Toxicity: oral

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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Annex XI of Regulation 1907/2006 and the REACH Guidance (R 6.2) permits the grouping of chemicals (chemicals categorisation). Barratt and Illing (2007, revised 2009a; 2009b, see attachments in section 13 of IUCLID data set) set out justification for an initial grouping of the polyols (oligomers and polymers) using a named core substance, with varying numbers of attached propoxy groups (or propoxy and ethoxy groups). The properties of the core substance and the repeating unit should be reflected in the polyols. The repeating unit is essentially non-toxic. If there are toxic properties associated with a core substance, these properties should reduce with increasing numbers of repeating units (i.e. increasing molecular weight).If both the core substance and the repeating unit are non-toxic, it can be anticipated that there will be no toxicity in the polyol.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995
Report Date:
1995

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 401 (Acute Oral Toxicity)
GLP compliance:
yes
Test type:
standard acute method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent

Test animals

Species:
rat
Strain:
Wistar
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Harlan-Winkelmann GmbH, Borchen, Germany
- Age at study initiation: 6 - 9 weeks
- Weight at study initiation: males 182 g; females 156 g

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 + 2 C
- Humidity (%): 55 + 5 %
- Photoperiod (hrs dark / hrs light): 12 hours light and dark period


Administration / exposure

Route of administration:
oral: gavage
Vehicle:
water
Details on oral exposure:
VEHICLE
- Amount of vehicle (if gavage): 10 ml/kg bw

Doses:
2000 mg/kg bw
No. of animals per sex per dose:
5
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: 7 and 14
- Necropsy of survivors performed: yes
- Other examinations performed: Clinical observations were made several times on the day of dosing and at least once a day during the 14 day observation period. Bodyweights were recorded immediately prior to dosing and on days 7, and 14. Gross pathological examination was carried out on all animals.

Results and discussion

Effect levels
Sex:
male/female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Mortality:
No death
Clinical signs:
No Signs
Body weight:
All animals gained in bodyweight over the observation period.
Gross pathology:
None identified

Any other information on results incl. tables

Annex XI of Regulation 1907/2006 and the REACH Guidance (R 6.2) permits the grouping of chemicals (chemicals categorisation).Barratt and Illing (2007, revised 2009a; 2009b, see attachmentsin section 13 of IUCLID data set) set out justification for an initial grouping of the polyols (oligomers and polymers) using a named core substance, with varying numbers of attached propoxy groups (or propoxy and ethoxy groups). The properties of the core substance and the repeating unit should be reflected in the polyols. The repeating unit is essentially non-toxic. If there are toxic properties associated with a core substance, these properties should reduce with increasing numbers of repeating units (i.e. increasing molecular weight).If both the core substance and the repeating unit are non-toxic, it can be anticipated that there will be no toxicity in the polyol.

 

A second round of grouping was based on allocation of the NLP polyols formed from different named core substances to one of two categories. The first group was those NLP polyols linked to the core substance by an ether linkage (category 1) and the second group (category 2) was those linked by a secondary/tertiary amine linkage. Category 1 consists of:

·        Sucrose, propoxylated, >1-16.5 moles propoxylated

·        propylidyne trimethanol, propoxylated, >1-6.5 moles propoxylated

·        Glycerin, propoxylated, >1-6.5 moles propoxylated

·        Propan-1,2-diol, propoxylated, >1-4.5 moles propoxylated

·        Pentaerythritol, propoxylated, >1-8.5 mol propoxylated.

·        Nitrilotriethanol, propoxylated, 1-6.5 moles propoxylated.

For details see attached documents ‘Grouping of NLP Polyols and their toxicokinetics assessments’ (Barratt and Illing (2007, revised 2009a) and PROPOSALS FOR FURTHER TESTING FOR THE NLP ‘POLYOLS’ (2009b) in section 13 of IUCLID data set. 

The registered substance is a complex substance (UVCB) which can be regarded as a mixture of Sucrose, PO and Glycerin, PO, two members of the grouping "NLP polyols linked to the core substance by an ether linkage" (= category 1). As, in all cases, the ether linked NLP polyols are non-toxic, it is anticipated that any mixture of them or any co-initiated polyol formed using a mixture of initiators will have a similar lack of toxicity. Thus the hazard profile for the multicomponent substance can be sufficiently described by the information of the individual constituents and it is unnecessary to test this co-initiated polyol.

The physico-chemical properties of these source substances and the target substance are very similar as displayed in Table 1 (test material highlighted in yellow).

Table 1: Comparison of physico-chemical properties of source substances with target substance

 

 

Source Substances

Target Substance

 

Glycerin + PO

Sucrose + PO

Glycerin + Sucrose + PO

Appearance

liquid

liquid

liquid

Melting point

no MP

no MP

no MP

Boiling point

Decomposition >= 290°C

no BP

Decomposition >= 210°C

Relative density

1.08 (20°C)

1.122 (20°C)

1.132 (20°C)

Partition coefficient

> -1.82 < -0.73

> -3.60 < -3.25

> -0.7 < 1.1

Water solubility

completely miscible

240 g/L (25°C)

completely miscible

Surface tension

53 nM/m (20°C; at 1 mg/L)

54.54 nM/m (20°C; at 1 mg/L)

61.3 nM/m (20°C; at 1 mg/L)
(Glycerol + PO)

Flashpoint

163°C (no information on pressure available)

149.5°C (1003 hPa)

198°C (1013 hPa)

Auto flammability

305°C (1014 ha)

355°C (1000 hPa)

350°C (1008 hPa)

Flammability

no pyrophoric properties
does not emit flammable gases in contact with water

no pyrophoric properties
does not emit flammable gases in contact with water

no pyrophoric properties
does not emit flammable gases in contact with water

Explosiveness

no explosive properties

no explosive properties

no explosive properties

Oxidising properties

no oxidising properties

no oxidising properties

no oxidising properties

Viscosity

560.6 mPa (20°C)

26.63 Pa s (20°C)

21.47 mPa s (20°C)

 

 

Therefore, in line with Annex XI, 1.2 of Regulation (EC) No 1907/2006, read-across (many-to-one) was chosen for the registered substance (with Polyether Sucrose + Glycerin+ PO) and thus no toxicological study has been performed with registered substance itself.

The model being used to justify read-across (many-to-one) is that the toxicity of the polyether polyol is derived from the core substance (initiator) and the repeating unit. While for propoxylated polyols the repeating unit is probably not classifiable, any toxicological property requiring classification is derived from the core substance. The fact, that the target chemical is formed from core substances (Sucrose and Glycerol) which are the same for two source substances (Sucrose, PO and Glycerin, PO), suggests that there are no major differences between these source substances and the target substance which may affect the toxicological properties.Due to the closeness of the compounds, polyols grouping data (= source substances data) is lead for Polyether Sucrose + Glycerin + PO (= target substance) according to Table 2 (see section 13 of IUCLID data set).

 

 

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The oral LD50 for test substance in male and female Wistar rats is >2000 mg/kg bw. No adverse effects were observed at this dose level.