Non-EP lubricant grades are rust and oxidation inhibited, only EP Lubricants are mild Extreme Pressure type. Note: Compounded oils must have 3-10% suitable animal fats. Put simply, the less viscous the fluid is, the. Thus, water is thin, having a lower viscosity, while honey is thick, having a higher viscosity. In everyday terms (and for fluids only), viscosity is thickness.
Viscosity charts iso#
The American Gear Manufacturers Association (AGMA) and the International Standards Organization (ISO) have established viscosity standards for hydraulic fluids and industrial gear lubricants.įollowing are the AGMA Lubricant Numbers, the corresponding ISO Grade and the viscosity ranges: Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress.
Viscosity charts manual#
Following is a table with the SAE gear lubricant viscosity grades: Centipoise is the unit of measure for viscosity, where 1 centipoise is the equivalent to the viscosity of water. Materials that are gel-like at rest but fluid when agititated are described as thixotropic. AGMA has redefined its grades to align with ISO standards, so they line up exactly. Viscosity is a measure of the resistance of a fluid to flow (usually through a specific orifice). ISO VG measures oil at 40C and a given range to +/-10 of their stated value, so ISO VG 100 oil will have a viscosity between 90 and 100 cSt at 40C.
For instance, an SAE 80W gear lubricant may have the same viscosity as an SAE 20W or SAE 30 engine oil and SAE 90 gear lubricant viscosity can be similar to that of an SAE 40 or SAE 50 engine oil. Oils grades that are on the same horizontal line (with the correct Viscosity Index) on the chart are equivalent. A gear lubricant and an engine oil having the same viscosity will have widely different SAE viscosity grade designations as defined in the two viscosity classifications. From the chart, the corresponding viscosities are 69.0 and 473 micropoises. Gear lubricant viscosity grades should not be confused with engine oil viscosity grades. ( 3 ) The viscosity of nitrogen at 0 C is 166.2 micropoises ( ref. The Society of Automotive Engineers (SAE) has devised a method for classifying the viscosity characteristics of gear lubricants as well. Following is the API description: SAE Viscosity Grades for Gear Lubricants The automotive and petroleum industries in cooperation with the American Society of Testing and Materials (ASTM), Society of Automotive Engineers (SAE) and the American Petroleum Institute (API) have developed a service classification system to serve as a guide for recommending and marketing gear lubricants. Viscosity Temperature Chart API Service Designation for Gear Lubricants SAE Viscosity Grades for Engine Oils – SAE J300 Dec 99
The chart shown at the bottom of the page graphically represents the viscosity-temperature relationship of the SAE grading system with lines drawn to show the viscosity characteristics for several popular motor oils. The Society of Automotive Engineers (SAE) viscosity grading system for engine oils consists of “W” grades that define low temperature viscosities and “straight” grades that put further limits on high temperature viscosities.
0 kommentar(er)
