Tensiometer Ring used for ASTM D971, ASTM D1331, ASTM D1590

By Hank Levi on Fri, Nov 30, 2012 @ 11:15 AM

There are many ASTM methods companies follow.  Here are a few of the more popular ASTM methods relating to surface and interfacial tension:

  • ASTM D971; Interfacial tension of oil against water: This standard is used to evaluate hydrocarbon fluids and possible contamination levels.  Evaluating hydrocarbon fluid contamination levels is important in numerous industries including transformer oil testing and most Fuels.  Our heavy use of petroleum products and the effects of hydrocarbon fluid contamination makes for an almost limitless list of applications that require testing.
  • ASTM D1331; Solutions of surface-active agents:  This standard applies to detergents and soaps but also includes emulsifiers and surfactants.  The test method determines the surface tension of popular substances including diswasher detergents and laundrey soap mixtures in water.
    ASTM D1331 is broken into two separate sections based on the liquid mixture being tested. ASTM D1331 method A applies to aqueous solutions containing surface-active agents. It includes water with two or more surfactants added. ASTM D1331 states that it "is also applicable to nonaqueous solutions and mixed solvent solutions." This includes electrolytes. ASTM D1331 applies to two-phase mixtures. Two-phase mixtures include a water and surfactant mixture containing air in the form of foam or bubbles. Two-phase mixtures include solid particles with the aqueous mixture. ASTM D1331 states "more than one solute component may be present, including solute components that are not in themselves surface-active." This allows for the surface tension testing of soaps when it includes artificial colorings, scents or skin conditioners. Surface tension testing methods do not change when multiple surfactants are included in the mixture.

    Read more: ASTM D1331 Methods | eHow.com http://www.ehow.com/info_8694874_astm-d1331-methods.html#ixzz2DivCVGeX
     This method applies to both aqueous and non-aqueous solutions
    ASTM D1331 is broken into two separate sections based on the liquid mixture being tested. ASTM D1331 method A applies to aqueous solutions containing surface-active agents. It includes water with two or more surfactants added. ASTM D1331 states that it "is also applicable to nonaqueous solutions and mixed solvent solutions." This includes electrolytes. ASTM D1331 applies to two-phase mixtures. Two-phase mixtures include a water and surfactant mixture containing air in the form of foam or bubbles. Two-phase mixtures include solid particles with the aqueous mixture. ASTM D1331 states "more than one solute component may be present, including solute components that are not in themselves surface-active." This allows for the surface tension testing of soaps when it includes artificial colorings, scents or skin conditioners. Surface tension testing methods do not change when multiple surfactants are included in the mixture.

    Read more: ASTM D1331 Methods | eHow.com http://www.ehow.com/info_8694874_astm-d1331-methods.html#ixzz2DivCVGeX
  • ASTM D1590; Surface tension of industrial water and Industrial waste water

The popularity of these ASTM methods require users to perform many of these tests day-to-day and in the process find themselves in situations where they either need to have their tensiometer ring repaired or replaced.  These platinum wire accessories while possessing a very high and durable melt-point can be damaged easily due to mishandling.  Damaged tensiometer rings can effect results so examine the rings routinely and handle with care at all times.

If you do find yourself in a situation where you need a quick repair for your Du Nouy Ring or need to find a replacement let us know.

 
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Du Nouy Ring Repair Service

By Hank Levi on Fri, Apr 06, 2012 @ 03:46 PM

Hi, this is Hank Levi, and I wanted to take a minute to tell you about what we're doing to provide repair service and replacement of new Du Nouy Rings.  We have been supporting operators working with popular manual and automatic tensiometers for about 10 years.  It may have been a result of the day-in and day-out working with these tensiometers that led us to where we are today...but it all started about 3 1/2 years ago when we started repairing Du Nouy Rings as part of our service.  About a year later we began providing New replacement Du Nouy Rings also.

Since then we have found customers who have needed help with Du Nouy Rings from other tensiometer manufacturers as well.  Last year Fisher Scientific stopped selling and servicing their tensiometers and with it their ability to provide Du Nouy Ring service.  We also discovered that customers of other manufacturers including Kruss, KSV, Kyowa, CSC, SEO and a few others might have a need for our du Nouy Ring service support too.

Well, the good news is that we are in the Du Nouy Ring business.  We can repair or provide replacement rings for any brand of Du Nouy Ring on the market.  This includes Du Nouy Rings for the popular Fischer Scientific Tensiomat, CSC Scientific, Kruss, KSV, Kyowa, SEO and more.

Do you have a need to have a ring repaired?  Or maybe you just need a new one.  Or maybe both.  Well we can help.  Just submit your contact information so we have a way to reach you and tell us what type rings you have.   We'll have someone contact you to review the details and if needed arrange to have your damaged rings sent in for service.
If you know of another person or organization that could benefit from our service please don't hesitate to forward this information to them.

Du Nouy Ring Repair ServiceCreated on 04/06/12 at 16:50:49

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How Much Does a Tensiometer Cost?

By Hank Levi on Mon, Sep 26, 2011 @ 03:37 PM

Tensiometers

 

Tensiometers are instruments used for conducting surface analysis on liquid substances.  Typical applications Tensiometers perform include measuring surface tension, interfacial tension as well as liquid density and Lamella Length on some Tensiometer models.  Some models can also perform other tasks including powder wettability and dynamic contact angle of a solid substrate.  Depending on the types of information the operator is seeking to find one model may be more appropriate than the other.

 

To help prospective users evaluate and compare the different types of models available in the market we have prepared a reference document we call the:

 

"Tensiometer Selection Matrix"

 

This matrix is not necessarily brand specific as it was designed to help those seeking to compare capabilities and prices among popular manual Tensiometer models vs. popular Automatic or "digital" Tensiometer models.

 

We hope you find the Tensiometer Selection Matrix helpful in your search and evaluation of Tensiometers.

 Created on 09/22/11 at 12:43:16

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How Interfacial Tension Helps Evaluate Emulsifications

By Hank Levi on Fri, May 27, 2011 @ 03:44 PM

oil and water emulsification

Measuring interfacial tension is effective in understanding how two or more immiscible liquids are, or can be - emulsified.

Immiscible liquids by definition are liquids incapable of being mixed to form a homogeneous substance.  Oil and water are immiscible.  We can act upon these immiscible liquids by emulsifying them into a single homogeneous substance referred to as an  emulsion.  Emulsifying two liquids that ordinarily do not mix well -such as oil and water- causes tiny droplets from one liquid to be suspended in the other liquid - forming an emulsion.

We refer to a liquid as a phase.  Where one phase meets another phase (liquid to liquid - oil to water for example) a boundary forms between them and an imbalance of forces occur.  The amount of the imbalance can attribute to an energy at the point where the two phases meet.  We refer to this energy as surface free energy where a measure of energy/area or interfacial tension as force/length can be observed.  Increasing the interface area by dispersing one liquid phase into another by emulsification or the use of a surfactant for example will result in a lower interfacial tension.  The Interfacial Tension is measured in Dynes per Centimeter using an instrument known as a tensiometer.

Understanding these relationships exist and measuring them under different testing conditions is important to understanding how many liquid products interact. Knowing the interfacial tension becomes more important for researchers on how best to pursue future R&D as well as for production managers to maintain quality control for existing products used every day.  Some examples of industry where effectively measuring and monitoring emulsifications is important include:

  • Food Products
  • Beverages
  • Dairy Products
  • Cosmetics
  • Chemicals
  • Pharmaceuticals
Developing fluid separation and dispersion of oils in dressings and mayonnaise are very commonly studied for food R&D.  Developing new cosmetic formulations are also popular and important. 
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