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Physical & Chemical properties

Viscosity

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Description of key information

The pieces of information that build the weight of evidence are the following:

A) Handbook from Flick (1991)       

Purity of min. 97%       

Method not described       

Value of viscosity: 0.325 mPa s at 20°C

B) Publication from Ren et al. (2007)       

Purity >99.0% (Chaoyang Chemical Co. Ltd.)       

Description of method and apparatus (capillary viscometer)       

Value of viscosity: 0.341 mPa s at 28°C

C) Publication from Wu et al., 2005       

Purity >99.4%

Description of method and apparatus (capillary viscometer)

Values of viscosity: 0.3786 mm2/s at 20°C and  0.3498 mm2/s at 30°C

D) Publication from Udovenko & Fialkov, 1958

Purity and methods not described

Values of viscosity: 0.336 mPa.s at 20°C and 0.304 mPa.s at 30°C

Key value for chemical safety assessment

Viscosity:
0.371 mm²/s (static)
at the temperature of:
20 °C

Additional information

The weight of evidence approach is justified as determined from more than one piece of information (independent sources). We claim the reliability, relevance, adequacy and quality of the weight of evidence:

-     Reliability: Klimisch score of 2 is assigned to the studies 

-     Relevance:

o  Relevance of test material: substance purity ranges from 97% to 99.4% without affecting the reproducibility of the endpoint value. The test material is equivalent to the submission substance identity.

o  Relevance of test method and conditions: the tested methods are described enough to demonstrate their comparability with internationally approved test guidelines.

o  Relevance of the endpoint: the values obtained extend over 50 years and show a good reproducibility.

Source

Dynamic viscosity [mPa.s] at temperature of

Static viscosity [mm2/s] at temperature of

20°C

28°C

30°C

20°C

28°C

30°C

Flick (1991)

0.325

 

 

0.377

 

 

Ren et al. (2007)

 

0.341

 

 

0.39605

 

Wu et al. (2005)

0.3262

 

0.3262

0.3786

 

0.3498

Udovenko & Fialkov (1958)

0.336

 

0.304

0.39024

 

0.35307

-     Adequacy: the endpoints, whereas obtained from not internationally approved test guideline, with different sources and purity of test item and at different temperatures, lead to a clear trend: viscosity of dimethoxymethane is 0.371    mm2/s at 20°C.

-     Quantity: four pieces of information are considered.