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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
05-11-2016 – 05-11-2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard OECD test guidelines
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Principles of method if other than guideline:
The boiling point determination of Test item Benzimidazole (CAS No. 51-17-2) was done as per the test guideline OECD 103 by Siwoloboff method.
GLP compliance:
not specified
Type of method:
method according to Siwoloboff
Specific details on test material used for the study:
- Name of test material : Benzimidazole
- Molecular formula : C7H6N2
- Molecular weight :118.1384 g/mol
- Smiles notation : c12c(nc[nH]1)cccc2
- InChl : 1S/C7H6N2/c12476(31)8597/h15H,(H,8,9)
- Substance Type: Organic
- Physical State: Solid crystalline powder (Off white)
- Purity: 99.5%
Key result
Boiling pt.:
> 250 °C
Atm. press.:
973.4 hPa
Decomposition:
no
Remarks on result:
other: The heating was continued till 250°C but no bubbles emerged from the capillary.Hence, the boiling point of the test item was inferred to be greater than 250°C.

Method Details

Observations

Remarks if, any

Guideline

OECD 103

 

Method

Method according to

Siwoloboff

 

Principle of Boiling

point test

A sample is heated gradually in a tube which is immersed in a liquid bath.

The sample tube is held in

close contact with a thermometer and it contains a boiling capillary which is

fused about1 cm above its lower end. Upon approach of the boiling temperature bubbles emerge rapidly

from the lower open end of

the capillary. The boiling temperature is that temperature at which, on

momentary cooling, the string of bubbles stops and liquid suddenly rises in the capillary.

 

Quantity of

chemical used

g/ml

2 g

Nature of the Bath

taken

Oil bath

Water bath

OIL

 

If oil bath is used, specify

Liquid paraffin

Silicone oil

SILICON

Atmospheric

pressure

hPa

973.4

mean Boiling

point (°C)

(RESULT)

°C

greater than 250

Conclusions:
The boiling point of Benzimidazole (CAS No. 51-17-2) is determined to be greater than 250°C at 973.4 hPa.
Executive summary:

The boiling point determination of Benzimidazole (CAS No. 51-17-2) was done following OECD Guideline 103 and according to the method of Siwoloboff. The boiling point was found to be greater than 250°C at 973.4 hPa.

Description of key information

The boiling point of Benzimidazole (CAS No. 51-17-2) is determined to be greater than 250°C at 973.4 hPa.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
250 °C

Additional information

The boiling point determination of Benzimidazole (CAS No. 51-17-2) was done following OECD Guideline 103 and according to the method of Siwoloboff. The boiling point was found to be greater than 250°C at 973.4 hPa.

Other supporting data from various reliable handbooks and authoritative databases, also determined the boiling point of chemical Benzimidazole as >360 degree C.