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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Viscosity

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Administrative data

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Endpoint:
viscosity
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a gas
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data taken from a published, peer-reviewed handbook.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Viscosity of the liquified gaseous substance
GLP compliance:
not specified
Type of method:
other: not stated
Temp.:
other: -69.0°C
Parameter:
other: cP
Value:
0.475
Temp.:
other: -50.0°C
Parameter:
other: cP
Value:
0.317
Temp.:
other: -40.0°C
Parameter:
other: cP
Value:
0.276
Temp.:
other: -33.5°C
Parameter:
other: cP
Value:
0.255

The viscosity was measured to be;

 

Viscosity (cP)

Temp (⁰C)

1

0.475

-69

2

0.317

-50

3

0.276

-40

4

0.255

-33.5
Conclusions:
The viscosity was measured to 0.475, 0.317, 0.276 & 0.255 centiposes at -69, -50, -40 & -33.5  ⁰C respectively.
Executive summary:

The viscosity of anhydrous ammonia was measured to 0.475, 0.317, 0.276 & 0.255 centiposes at -69, -50, -40 & -33.5  ⁰C respectively.

Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Value taken from a published handbook.
Qualifier:
no guideline followed
Principles of method if other than guideline:
No methodological data are reported
GLP compliance:
no
Type of method:
other: No details
Temp.:
other: -40.0°C
Parameter:
dynamic viscosity (in mPa s)
Value:
5
Remarks on result:
other: Aqueous ammonia 26%
Temp.:
other: -17.7°C
Parameter:
dynamic viscosity (in mPa s)
Value:
2.8
Remarks on result:
other: Aqueous ammonia 26%
Temp.:
other: 1.1°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1.7
Remarks on result:
other: Aqueous ammonia 26%
Temp.:
other: 26.7°C
Parameter:
dynamic viscosity (in mPa s)
Value:
1.1
Remarks on result:
other: Aqueous ammonia 26%
Temp.:
other: 48.9°C
Parameter:
dynamic viscosity (in mPa s)
Value:
0.7
Remarks on result:
other: Aqueous ammonia 26%

The viscosity of aqueous ammonia (26%) is temperature-dependent and is reported to be between 0.7 -5 centipoise (mPa.s) at temperatures of between -40 and 48.9 degrees Celsius. The viscosity at 26.7 degrees Celsius is reported to be 1.1 centipoise (mPa.s).

Conclusions:
The viscosity of aqueous ammonia is temperature-dependent
Executive summary:

The viscosity of aqueous ammonia (26%) is temperature-dependent and is reported to be between 0.7 -5 centipoise (mPa.s) at temperatures of between -40 and 48.9 degrees Celsius. The viscosity at 26.7 degrees Celsius is reported to be 1.1 centipoise (mPa.s)

Description of key information

The substance is a gas at room temperature: this endpoint is not relevant.

Key value for chemical safety assessment

Viscosity:
0.255 mPa · s (dynamic)
at the temperature of:
-33.5 °C

Additional information

The data requirement can be waived as the substance is a gas at room temperature and atmospheric pressure. However the viscosity of anhydrous ammonia was measured to 0.475, 0.317, 0.276 & 0.255 centipoises at -69, -50, -40 & -33.5  ⁰C respectively (CRC Handbook).