A turbidimetric method for the rapid evaluation of MWF emulsion stability

J. Deluhery, N. Rajagopalan

Research output: Contribution to journalArticlepeer-review


The stability of metalworking emulsions is a critical characteristic impacting its usefulness as a lubricant and rust inhibitor. Loss of stability usually results in replacement of the fluid leading to both economic loss and environmental discharge. In this paper, the loss of stability caused by accumulation of hardness ions is examined by a turbidimetric method. The method is based on following the change in the wavelength exponent of the emulsions caused by changing particle size. The stability as determined by this method is compared to conventional testing based on phase separation over 24 h. The turbidimetric method is shown to be a more conservative estimate of emulsion stability. The simplicity of the method makes it useful for both product formulation and process control.

Original languageEnglish (US)
Pages (from-to)145-149
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number2-3
StatePublished - Apr 22 2005


  • Metalworking fluid
  • Oil-in-water emulsions
  • Stability
  • Turbidity

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


Dive into the research topics of 'A turbidimetric method for the rapid evaluation of MWF emulsion stability'. Together they form a unique fingerprint.

Cite this