Sodium phosphinate

Viscosity

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

Test material information

Constituent 1

Reference substance name:

Sodium phosphinate

EC Number:

231-669-9

EC Name:

Sodium phosphinate

Cas Number:

7681-53-0

Molecular formula:

H3O2P.Na

IUPAC Name:

sodium phosphinate

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

Viscosity

Viscosity 1

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)

Viscosity 2

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.