Applicable ASTM Methods

ASTM Methods that call for DuNouy Ring Tensiometers are:

D971 - Interfacial Tension of Oil Against Water
D1331 - Solutions of Surface Acting Agents
D1417 - Synthetic Rubber Lattices
D1590 - Surface Tension Industrial Water and Industrial Wastewater

Check Out the Video on Calibration

If you need to calibrate your Tensiometer, check out this video: "How To Calibrate a CSC Tensiometer"

Get the Video on How to Run a duNouy Tensiometer Test

Pricing

Pricing for both tensiometers is detailed in our on-line storeat CSC Precision Tensiometer and CSC Interfacial Tensiometer.

Check the Scope of CSC Tensiometers

CSC Precision and Interfacial
DuNouy Tensiometers

CSC offers two duNouy Tensiometers. Both of these tensiometers operate with a precision of ± 0.05 dynes/cm.

CSC Precision Tensiometer

To measure the surface tension between a liquid and the air, the duNouy ring is placed below the surface of the liquid. This test is performed by pulling the ring upward through the surface of the liquid.

The force needed for the ring to break the surface (overcome the surface tension) is determined. This measurement is in dynes/centimeter. The Tensiometer that is made for this purpose is the CSC Precision Tensiometer.

Product Specs:

Measurement Range: 0-90 dynes/cm
Accuracy: +/- 0.05 dynes/cm
Sample Stage Operation: Manual
Measurement: Apparent Surface Tension
Correction Factor for Actual Surface Tension

CSC Interfacial Tensiometer

There are applications where the surface tension at the boundary of two liquids needs to be measured. This is called interfacial surface tension.

The Tensiometer for this test needs to pull the ring up through the boundary between the lower, higher density liquid, and the liquid that is floating above. The force needed to break through the surface of the higher density liquid is recorded as interfacial surface tension.

The force needed to break the boundary going from the floating liquid to the greater density liquid is measured by pushing the ring down through the boundary. This force is also measured in dynes/centimeter and is also interfacial surface tension.

The instrument used to do these tests is the CSC Interfacial Tensiometer.

Product Specs:

Measurement Range: 0 to +90 dynes/cm (surface tension); 0 to -90 dynes/cm (interfacial tension)
Accuracy: +/- 0.1 dynes/cm
Sample Stage Operation: Manual
Measurement: Apparent Surface Tension
Correction Factor for Actual Surface Tension

Replacement duNouy Rings

Do you need rings?

For the Precision Tensiometer the part number is 70537000.

The Interfacial number is 70542000.

You can order on-line at the CSC Store, or by completing the form, or calling us 703-876-4030.

Get the Manual

Decorative & Hard Chrome

The CSC Tensiometer helps decorative and hard chrome platers meet EPA regulations on chromium emissions. The regulations state that there is a direct relationship between surface tension and chromium emissions.

Results of the surface tension tests help the platers maintain bath conditions that meet EPA emission requirements.

More About Interfacial Surface Tension

We published a short piece discussing Interfacial Surface Tension.

Here is the link to it.

We are Here to help you find the best Tensiometer Solution.

If you are just visiting for general interest great. If you need a quote, want to discuss you application or need more information simply let us know.

You can reach us by email at tensiometer@cscscientific.com.

If you prefer to text use 703-608-1349. You can also chat with us using the Help Button at bottom right. You can also send us your contact information and questions or call us at 703-876-4030.

Surface Tension