For example, a lubricant with an ISO grade of 32 has a viscosity within the range of 28.8-35.2, the midpoint of which is 32. Equivalent viscosities for 100 & 210F are shown SAE 90 to 250 and 20 to 50 specified at 100C. This comparative viscosity chart shows the relationship between the various viscosity grading systems (viscosities are related horizontally). ISO are specified at 40C AGMA are specified at 40C SAE 75w, 80w, 85, 5w, & 10w specified at low temperature. The higher the number, the more consistent the oil is. Viscosity Charts Viscosities can be related horizontally only Viscosities based on 96 VI single grade oils. What you need to look at is the viscosity index, which provides a measure of how consistent the viscosity of the oil is across a temperature range. Each ISO viscosity grade number corresponds to the mid-point of a viscosity range expressed in centistokes(cSt) at 40☌. For example, a 5W or 7W fork oil might end up being thicker than a 10W or 15W fork oil, which can make choosing one even harder. Viscosity grade comparison charts like this one are relatively easy to find, but they can be a bit difficult to understand. Many petroleum products are graded according to the ISO Viscosity Classification System, approved by the international standards organization (ISO). Materials that are gel-like at rest but fluid when agititated are described as thixotropic. SAE 90 to 250 and 20 to 50 specified at 100☌. Viscosity is a measure of the resistance of a fluid to flow (usually through a specific orifice).
#Viscosity comparison chart series
This might surprise you if youre thinking that gear. 1 on this series proposed an extrapolation chart with reference ranges1, based on a validated mathematical formula2 and upon which issues No. Viscosities based on 96 VI single grade oils.Įquivalent viscosities for 100° & 210☏ are shown For example, the chart indicates that an SAE 50 engine oil and an SAE 90 gear oil are the same viscosity. Viscosity numbers range from one to millions of centipoise (cps), When it comes to polyurethanes and epoxies, keep in mind that temperature can have a major impact on a resin’s viscosity. Turn the tube around, start the stop watch when the air bubble crosses the 27 mm line and stop when the bubble crosses the 100 mm line.Viscosities can be related horizontally only The term viscosity refers to the thickness or flow-ability of a liquid. Fill the tube up to the 100 mm line, insert the cork down to the 108 mm line and turn the tube bottom up. The tube has three amber ring marks at 27, 100 and 108 mm from the bottom. Verticality control: 5° slant = 10 % error.Please be aware of the following accuracies when performing the test: The rise time in seconds of the sealed tubes and samples can also be determined using a basic timer.Practice for Viscosity-Temperature Charts for Liquid Petroleum Products. Turn over the holder and visually compare what letter best matches the rise time of the bubble in the sample go to Viscosity Units Converter Viscosity Comparison Chart UNITS OF VISCOSITY DYNAMIC VISCOSITY Poise (symbol: P) + centiPoise (symbol: cP) Named after the French physician Jean Louis Marie Poiseuille (1799 1869), this is the CGS unit of viscosity, equivalent to dyne-second per square centimetre. The viscosity index (VI) allows for comparison of the viscosity behavior of.Fill the sample tube with liquid, insert a cork, and then using the tube holder 0577, insert the four lettered tubes and the sample tube into the holder Kinematic Viscosities ISO 1500 680 460 320 220 150 100 AGMA Grade SAE Crankcase 15M.Knowing the approximate viscosity, pick four standard tubes closest in viscosity to your sample.
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