For example, ISO VG 22 refers to a viscosity grade of 22 cSt ± 10% at 40°C. The viscosity at different temperatures can be calculated using the viscosity at 40°C and the viscosity index (VI), which represents the temperature dependency of the lubricant. This classification defines 20 viscosity grades in the range of 2 to 3200 square millimeters per second (1 mm2/s = equals 1 cSt) at 40ºC (104ºF). For petroleum-based liquids, this covers approximately the range from kerosene to cylinder oils. Kinematic Viscosity The ratio of the absolute viscosity of a liquid to its density frequently occurs in the study of viscosity and hydraulics and the term "kinematic viscosity" with the symbol V has been assigned to it where p is the density. In the metric system, the unit of kinematic viscosity is the square centimeter per second or the stoke. cP is the expression for dynamic viscosity, or absolute viscosity of the oil, and is the measure of the fluids resistance to flow. cSt is the expression for Kinematic viscosity, which is the ratio of a fluids viscous force to it's interial force. The ISO viscosity classification uses mm2/s (cSt) units and relates to viscosity at 40oC. It consists of a series of 18 2viscosity brackets between 1.98 mm /s and 1650 mm2/s, each of which is defined by a number. The numbers indicate to the nearest whole number, the mid points of their corresponding brackets.
Centipoise (cP) and Centistokes (cSt) are the units viscosity is measured in. The following chart shows a comparison of different viscosity grades versus Approximate Viscosities of Some Common Liquids Coffee Liquor 30-40%. 10- 100. 20. T. Custard. 1.6. 1500. 85-90. T. Edible Oil. 0.9. 65. 20. N. Gelatine 37% depend on the viscosity and other oil properties and on the bearing internal geometry, speed, and size. When the rolling bearings increases with oil viscosity, it is necessary to select is mm2/s (also known as cSt). [6] ASTM D341– 09, Standard Practice for Viscosity-Temperature Charts for Liquid Petroleum Products. Centipoise is a unit of dynamic viscosity, often used for expressing the internal friction of oil in low temperatures. The connection of cSt and cP is cP = cSt x fluid
The first part of the grade (10W) is the comparable grade of the single viscosity oil that features the oil’s weight at cold temperature. The second part of the grade (30) is the grade of the comparable single viscosity oil that defines its viscosity at 212 degrees Fahrenheit.
The other unit is the Centistoke (cSt) which is used to report the kinematic viscosity of motor oil at high temperatures. The number reflects the time required for a The viscosity of an engine oil is significant for three primary reasons. SAE Viscosity Chart (High Temp) As shown in the graph below, the average viscosity for the 5W-30 major brands tested is 10.4 cSt @100°C. Also important to note there Viscosities and densities of ISO - and equivalent SAE grade oils. centiStokes, 10-6 reyns (lb s/in2), kg/m3, lb/in3 or Absolute Viscosity Converting Chart - Dynamic viscosity converting chart with units like Poiseuille - Poise - centiPoise and The viscosity grade of a lube oil is determined by the Society of Automotive Engineers (SAE). Oils can be separated into multigrade oils and monograde oils.
Here is a handy liquid viscosity chart of common liquids and their viscosity in Centistokes (cSt). Saybolt Second Universal (SSU). Water. 1. 1. 31. Milk. 3. 4. 40. No. 4 Fuel Oil. 12.6. 15.7. 80. Cream. 20. 20.6. 100. Vegetable Oil. 40. 43.2. 200. Velocity and Flow Capacity of Oil Standard Tubes. Equations for Flow Fluid Characteristics Chart Table, Density, Vapor Pressure and Kinematic Viscosity · Hazen-Williams Kinematic Viscosity. °F, °c, °K, CentiStokes, m2/sec, ft2/sec. Mar 16, 2015 As an example: 30W oil flows much faster at higher temperatures. Viscosity-Chart . Fluids are most commonly measured in Sabolt Universal equivalent to 10,000 St. Usually, centistokes (cSt) is used (1 cSt = 0.01 St = 1 The viscosity of lubricating oil changes with temperature and the rate of change In case of lubricants the viscosity is very important because it affects the oil's ability to reduce friction Low-Shear-Rate Kinematic Viscosity (cSt) at 100 °C max. The higher the measure of viscosity at 100 deg C in centistrokes (cSt), the higher the oil's weight. The following chart shows the viscosity an oil must be at a