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Viscosity

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Reference
Endpoint:
viscosity
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 21 May 2012 to 30 August 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Test Guideline 114 (Viscosity of Liquids)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO Standard 3219
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
2012-12-15
Type of method:
other: rotational spindles
Key result
Temp.:
20°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 28.65
Temp.:
40°C
Parameter:
dynamic viscosity (in mPa s)
Value:
ca. 17.54

The results of the dynamic viscosity measurements are explained as a function of the shear rate. The mobile SC4-21 was chosen (for viscosity situated between 2.4 and 46865 mPa.s).

Results at 20°C:

Rotation speed (rpm) Assay N°1 (mPa.s) Assay N°2 (mPa.s) Shear rate (s-1)
20.00 29.06 29.99 18.60
21.00 28.79 29.90 19.53
22.00 28.55 30.25 20.46
23.00 28.12 29.75 21.39
24.00 27.73 29.88 22.32
25.00 27.74 29.81 23.25
26.00 27.58 30.10 24.18
27.00 27.77 29.68 25.11
28.00 27.62 29.46 26.04
29.00 27.63 29.74 26.97
30.00 27.49 29.68 27.90
35.00 27.99 29.86 32.55
40.00 27.88 29.76 37.20
45.00 27.70 29.58 41.85
50.00 27.84 29.43 46.50
55.00 28.03 29.48 51.15
60.00 27.65 29.29 55.80
65.00 28.05 29.27 60.45
70.00 28.05 29.32 65.10
75.00 27.99 29.18 69.75
80.00 27.65 29.11 74.40
90.00 27.60 29.00 83.70
100.00 27.56 29.06 93.00
110.00 27.52 28.93 102.30
120.00 27.65 29.06 111.60
130.00 27.51 28.98 120.90
140.00 27.52 28.99 130.20
150.00 27.56 28.96 139.50
160.00 27.50 28.91 148.80

Assay N°1 was performed with a increasing rotation speed . Assay N°2 was performed with a decreasing rotation speed.

The mean dynamic viscosity of the test item at 20.0 ± 0.2 °C was 28.65 ± 0.81 mPa.s.

Results at 40°C

Rotation speed (rpm) Assay N°1 (mPa.s) Assay N°2 (mPa.s) Shear rate (s-1)
30.00 17.18 17.96 27.90
31.00 17.69 17.99 28.83
32.00 18.01 18.01 29.76
33.00 17.75 18.04 30.69
34.00 17.78 17.92 31.62
35.00 17.81 17.94 32.55
36.00 17.57 17.83 33.48
37.00 17.35 17.99 34.41
38.00 17.51 18.01 35.34
39.00 17.78 18.27 36.27
40.00 17.81 18.28 37.20
45.00 17.29 17.91 41.85
50.00 17.06 18.18 46.50
55.00 17.21 17.72 51.15
60.00 17.26 17.73 55.80
65.00 17.30 17.74 60.45
70.00 17.14 17.74 65.10
75.00 17.18 17.75 69.75
80.00 17.16 17.63 74.40
90.00 17.08 17.60 83.70
100.00 17.15 17.57 93.00
110.00 17.13 17.51 102.30
120.00 17.07 17.54 111.60
130.00 17.05 17.52 120.90
140.00 17.07 17.47 130.20
150.00 17.09 17.47 139.50
160.00 17.08 17.49 148.80
170.00 17.04 17.48 158.10
180.00 17.05 17.44 167.40
190.00 17.04 17.46 176.70
200.00 17.06 17.43 186.00

Assay N°1 was performed with a increasing rotation speed . Assay N°2 was performed with a decreasing rotation speed.

The mean dynamic viscosity of the test item at 40.0 ± 0.2 °C was 17.54 ± 0.22 mPa.s.

Taking into account the results obtained at 20.0 and 40.0 °C, the test item was considered to have Newtonian properties in the experimental conditions used.

Conclusions:
The mean dynamic viscosity of the test item at 20.0 ± 0.2 °C was 28.65 ± 0.81 mPa.s.
The mean dynamic viscosity of the test item at 40.0 ± 0.2 °C was 17.54 ± 0.22 mPa.s.
Taking into account the results obtained at 20.0 and 40.0 °C, the test item was considered to have newtonian properties in the experimental conditions used.
Executive summary:

The viscosity of the substance EC 242-893-1 in aqueous solution was investigated in a GLP-compliant study performed in accordance with OECD Guideline 114 (Viscosity of Liquids). The mean dynamic viscosity of the test item at 20.0 ± 0.2 °C was 28.65 ± 0.81 mPa.s. The mean dynamic viscosity of the test item at 40.0 ± 0.2 °C was 17.54 ± 0.22 mPa.s. Taking into account the results obtained at 20.0 and 40.0 °C, the test item was considered to have Newtonian properties in the experimental conditions used.

Description of key information

The viscosity of the REACh substance (2-Hydroxy-3-sulphopropyl) dimethyl[3-[(1-oxododecyl) amino]propyl]ammonium hydroxide (EC 242-893-1) in aqueous commercial product) was investigated in a GLP-compliant study (Grevin, 2012) performed in accordance with OECD Guideline 114 (Viscosity of Liquids). The mean dynamic viscosity of the test item at 20.0 ± 0.2 °C was 28.65 ± 0.81 mPa.s. The mean dynamic viscosity of the test item at 40.0 ± 0.2 °C was 17.54 ± 0.22 mPa.s. Taking into account the results obtained at 20.0 and 40.0 °C, the test item was considered to have Newtonian properties in the experimental conditions used. The study was performed on a commercial product (aqueous solution) as the substance EC 242-893-1 is manufactured and used in a liquid form.

Key value for chemical safety assessment

Viscosity:
28.65 mPa · s (dynamic)
at the temperature of:
20 °C

Additional information

The viscosity of the substance EC 242-893-1 in aqueous solution was investigated in a GLP-compliant study (Grevin, 2012) performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and was selected as key study for the endpoint.

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