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Physical & Chemical properties

Viscosity

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Administrative data

Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Documentation insufficient for assessment. No guideline followed, no data on test method only the apparatus used was cited.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1998
Report Date:
1998

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
apparatus: Haakte VT 500, in a thermostated bath at 20 °C and calibrated with millipore water (0.001 Pa.s)
GLP compliance:
no
Remarks:
but certified ISO 17025 : "testing laboratory for safety testing in the field of chemistry, protection against explosion and fire, electrostatic, storage, transport"
Type of method:
rotational viscometer (dynamic)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material: liquid sample, hyposphosphite de sodium 810 g/L
- Lot/batch No.: 7 samples from different batches have been used
for details see table 1 in the Results freetext
- Sample concentrations : 810 g/L (commercial concentration)

Results and discussion

Viscosityopen allclose all
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
> 19 - < 23
Remarks on result:
other: 6 solutions at 810 g/L in concentration (average: 21 mPa.s)
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
3
Remarks on result:
other: solution at 50% concentration

Any other information on results incl. tables

Table 1: details of the measured viscosity

Name

Sample designation

Number of lot

Viscosity

(Pa.s)

Sodium hypophosphite 810 g/L

L1

97-51

0.023

L2

97-53

0.020

L3

98-2

0.022

L4

98-17

0.019

L5

98-18

0.022

L6

98-19

0.021

H3PO2

L11

nd

0.003

nd: no data

Remark: another data is given but without indication of the concentration nor the lot. associated viscosity is 0.055 Pa.s

Applicant's summary and conclusion

Conclusions:
In the test conditions, the viscosity (dynamic) of sodium hypophosphite in solution at 810 g/L is between 19 and 23 mPa.s (average 21 mPa.s)
Executive summary:

Viscosity of solution of sodium hypophosphite (ie: hypophosphorous acid solutions) was measured with rotational viscometer in a thermostated bath at 20 °C and calibrated with millipore water (0.001 Pa.s). 6 lots at commercial concentration of 810 g/L have been tested plus one additional sample at a concentration of 50%.

No more data are given in the study report.

Dynamic viscosity was between 19 and 23 mPa.s (average at 21 mPa.s) at 810 g/L and 3 mPa.s at 50% in concentration.

As documentation is insufficient for assessment this study is considered as not assignable.