![]() ![]() Viscosity is measured with a spindle emersed in the material, rotated at a constant speed with a digital readout. For quality control, we always recommend a viscosity meter. Related article: Thinners for Conformal Coatings Methods of Measuring Viscosityįinally, in this edition, we’ll look at two methods for measuring viscosity. So always be careful when diluting material. Intrinsic viscosity is used to classify polymers and helps to identify the applications that specific polymers can be used for. Therefore, always compare with the HumiSeal thinner compatibility chart or with the HumiSeal technical department before preblending a HumiSeal product.Īs can be seen by the chart, the first 30% addition of thinner has the greatest effect on viscosity. Intrinsic viscosity determination is used in the field of polymer chemistry, which is a chemistry subdiscipline that deals with the synthesis of polymers as well as the analysis of a polymer’s structure and properties. It should be remembered that each type of thinner will reduce the viscosity of material at different rates. ![]() In this example, we are using 1R32A-2 conformal coating-with a starting viscosity around 200 cps-and our thinner type 600 (this will make 1R32A-2 preblend 65). In the next chart, we look at the relation between solvent addition and viscosity. ![]() Dilution and Viscosity: How % of Thinner Affects Viscosity This will increase the accuracy of the measurements taken. For viscosity measurements on-site, it is important to ensure the temperature and humidity conditions are within the range established by the user of the material (e.g. When testing a batch material or developing a preblend, HumiSeal uses 25☌ as the standard temperature condition. As can be seen by the graph, for every 5☌ increase in temperature, there is a five cps drop in viscosity. This will show why it is important to measure viscosity at the correct temperature. To explain the effect of the temperature of viscosity, we will use one of our standard preblend materials: 1R32A-2 PB 65. Temperature and Viscosity: How Temperature Affects Viscosity The values are defined in a specification known as API 1509 and are based on the resistance the oil gives to flowing at two different temperatures cold and high temperature. Motor oil viscosity grades are based on a scale developed by the API (American Petroleum Institute) lubricant organization. The lower the number, the less viscous the material, as can be seen by this comparison chart: starting with water at 1 cPs and ending with honey at anywhere between 2,000 – 10,000 cPs. Viscosity is the resistance to flow of a fluid. Viscosity is the internal friction of moving fluid and a measurement of the resistance of a fluid deformed by shear stress. We will start with the definition of viscosity. This is the first in a short series on material viscosity, in which we will review what it is and how to measure it. ![]()
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