This requires a precise and clear dialogue on the measures established by each other. This very frequent and quite legitimate question has its source in the notion of rheological behavior, which we will deal with in the second chapter. Why don’t I find the same viscosity value as my supplier? What information should I communicate around this viscosity value? Specify the standard used where measurement conditions will help to dialogue between services, with your customers and your suppliers. Why do I need the viscosity value? Meet a standard, check the stability of the product quality, validate an industrial process, innovate, provide a specification to a customer.ĭefining the purpose of this measure is the first step.ĭoes the temperature at which I am measuring reflect the time I want characterize? it is very important to be as close as possible to what the product undergoes in its life cycle.ĭo the quantified results of this measure allow me to identify discrepancies that I judge between two products? The precision of a measurement is not enough to make it relevant. The answer to this question raises other questions: It is therefore important to clearly define what information you want to collect before embarking on a measure of “viscosity” that could prove difficult or unnecessary to better qualify your product.ġ.2 Is the measure of the defined viscosity relevant? In the field of polymers, there are other viscosity values such as specific viscosity, intrinsic viscosity, and relative viscosity, which make it possible to calculate the average viscous molar mass of these polymers in solution. s (1 mPa.s = 20☌ water viscosity) or Poise or cPoise. It can consider the rheological behavior of the product, which gives it an absolute character. It is expressed in Stokes, cStokes or cm2/s.ĭynamic viscosity h (Eta) qualifies most formulated products it is free from the effect of density and is most measured with rotary instruments. Kinematic viscosity n (nu), resulting from a flow time measurement, takes account of gravity and concerns rather less viscous fluids and simple rheological behavior: Newtonian fluids. This frequently asked question deserves clarification as there are several viscosity values to qualify a product: 1 Viscosity Defined 1.1 What is the viscosity of my product?
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