Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100c1 this standard is issued under the. A higher viscosity implies a slower flow and a thicker fluid. The lower the vi, the more the viscosity is affected by changes in temperature. The viscosity index is calculated by the following formula.
Main applications for new and older diesel powered vehicles suitable for new and older diesel powered vehicles from class 8 tractortrailers to heavy duty diesel pickups, delivery, utility, and school bus fleets. To continue using viscosity after this period you will need to purchase a license. Low volatility and excellent thermal stability are beneficial for achieving extended drain intervals in severe cogeneration engine service. The viscosity index vi is an arbitrary, unitless measure of a fluids change in viscosity relative to temperature change. Viscosity index viscosity index vi defines the viscosity relationship with temperature. In this paper viscosity index of soybean oil was determined using tree methods. The viscosity index vi is an arbitrary, unitless measure of a fluids change in viscosity relative. It stands alone as an independent lubricant performance. Hygard retains proper viscosity over a wide range of operating temperatures thanks to its polymeric viscosity improver. This publication is intended to replace the previous viscosity index tables.
The scale of viscosity index is numerical in nature, with zero being the most susceptible to changes in viscosity. Viscosity index vi defines the viscosity relationship with temperature. The viscosity index vi allows for comparison of the viscosity behavior of different oils. Vi l u l h 10 where, vi is viscosity index u is the kinematic viscosity of oil of interest l and h are the kinematic viscosity of the. Too often the viscosity index vi is disregarded as a lubricant selection parameter. The batch size, type of polymer and formulation dictate which machine is most suitable. Silverson is the world leader in design and manufacture of high shear mixers for rapid dissolving of viscosity index improvers into luboils, ranging from high shear inline mixers to complete solubilizing plants. Viscosity classifications industrial lubricant cassifications iso international standards organisation viscosity classification the iso viscosity classification uses mm2s cst units and relates to viscosity at 40oc. Viscosity 5 viscosity coefficients viscosity coefficients can be defined in two ways. Basic viscosity presentation free download as powerpoint presentation. This document is available in either paper or pdf format.
The vi is calculated from the viscosity of the polymer in oil solution at 40 c and at 100 c. The viscosity index vi is a useful tool for lubricant users and refiners. It also applies to fluids like engine and automatic transmission oils, gear lubricants, and powersteering fluids. The following bibliographic material is provided to assist you with your purchasing decision. This standard is issued under the fixed designation d 2270. The proper viscosity allows it to work effectively, flowing readily through any part of the system. High speed dissolving of viscosity index improvers in. In this article, viscosity indices was presented for a number of vegetable oils, crude rapeseed oil, degummed rapessed oil, rapeseed oil dry, rapeseed oil bleache and refined rapeseed oil using. Extended oil drain capability and intervals blended into the synthetic base stocks is a highly advanced proprietary performance additive package. Viscosity index is a measure for the change of kinematic viscosity with. Manual ds39b ds39b viscosity index tables for celsius. Simply put viscosity is a physical property of a fluid or gas that reflects its tendency to flow. The high viscosity index of our paos provides maximum protection in both. C astm d92 oc 400 colour astm 1% dilution astm d1500 0,5 aniline point astm d611 oc 96 103 paraffinic oil 60 specification test method unit.
Viscosity index vi is a scale used to measure how much an oils viscosity, or resistance to flow, changes depending on its temperature. After buying viscosity you will receive a license code that will activate your copy, so you dont need to download viscosity again. The viscosity of low vi oils change significantly with temperature the viscosity of high vi oils changes much less with temperature 30 120 vi 50 0 100 150 0 vi 200 250 40 50 60 70 80 temperature, celsius 90 100 110 300 kinematic viscosity, mm 2 s. Engine oils are widely used for lubrication purposes in automobile and related industries. Vi viscosity index vi is an empirical measure of how much the viscosity of a lubricating oil changes with a change in temperature. Pdf in this paper viscosity index of soybean oil was determined using tree methods. Convenient reference tables for obtaining calculated viscosity index vales obtained from basic kinematic values in centistokes given in astm standard d 2270 and in standards on viscosity tables for kinematic viscosity conversions. This precision is sufficiently good for works control, has been satisfactory for trading, and is within the requirements demanded by efficient lubrication. Viscosity is a tensorial quantity that can be decomposed in different ways into two independent components. Method d 227074 was prepared in compliance with worldwide agreements.
The viscosity of a fluid is its resistance to flow and is highly influenced by temperature. Dont ignore viscosity index when selecting a lubricant. Kinematic viscosity is the dynamic viscosity divided by the density typical units m2s, stokes, st. Generally speaking, the less it changes, across a range of temperatures, the better. Viscosity index vi improver has found its largest commercial applications as additives to engine oils. Jstor may 2018 learn how and when to remove this template message. Standard practice for calculating viscosity index from kinematic viscosity at 40 and 100c. Enhanced film strength at high operating temperatures low coefficients of traction, which result in improved fuel economy benefits.
Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at. Some people think the viscosity index is incorporated in the iso viscosity grade, but it is not. Kinematic viscosity values at 40 and degrees are given. Astmd2270 standard practice for calculating viscosity. There are two standard procedures to calculate the viscosity index. We commonly refer to high viscosity fluids as being thick and low viscosity fluids as being thin. Viscosity index improvers and polymer architectures 2 linear comb multi star hyper branch dendrimer increasing viscosity influence increasing shear stability fact vmsviis are additives that minimize the change of fluid viscosity with temperature popularempirical belief change in.
Dynamic viscosity, also absolute viscosity, the more usual one typical units pas, poise, p. It is mostly used to characterize the viscosity temperature behavior of lubricating oils. Viscosity describes a fluids internal resistance to flow and may be thought of as a. It consists of a series of 18 2viscosity brackets between 1. Calculator for viscosity index vi according to astm d2270 and iso 2909. Ocp viscosity index improver application hitec 5748 additive is an olefin copolymer ocp vi improver recommended for use in gasoline and diesel engine lubricants, particularly when excellent shear stability and hightemperature, highshearrate viscosity is desired. The smaller the difference in viscosity at low 40 c and at high 100 c temperatures, the higher the vi number or index obtained.
This download is a fully functional version of viscosity, which will stop working after 30 days. Product specification paraffinic oil unit specification. Viscosity index an entirely empirical parameter which would accurately describe the viscosity temperature characteristics of the oils. Pdf standard practice for calculating viscosity index.
Petroleum products calculation of viscosity index from. Viscosity index is a dimensionless number that represents how the viscosity of a hydraulic fluid changes with temperature. This article appeared in a journal published by elsevier. Such viscosity index data may be considered as suitable for information only and not for specification purposes. Pdf viscosity index improvement of lubricating oil fraction sae.
Basic viscosity presentation viscosity shear stress. Oil thats too heavy will cause sluggish operation and lower. The viscosity index is important both for new oils and for inservice oils. One reason is simply because it is poorly understood. Oil thats too light can cause increased wear and generate heat.
The information contained in this document is based upon data believed to be reliable at the. Pdf an investigation was conducted for the improvement of viscosity index of a lubricating oil fraction sae 30 obtained from vacuum. A high vi can be interpreted as meaning that a polymer increases the viscosity of the fluid without polymer proportionately more at high temperatures than at low temperatures. Shear stability index ssi measures loss of polymer added viscosity after. Standard practice for calculating viscosity index from. These new tables are based on astm method d 227074 for calculating viscosity index from kinematic viscosity at 40 and 100c. Y kinematic viscosity at 100 c of the oil whose viscosity index is to be calculated, mm2s, and h kinematic viscosity at 40 c of an oil of 100 viscosity index having the same kinematic viscosity at 100 c as the oil whose viscosity index is to be calculated, mm2s. Ultra gear 320 is a mineral oil containing a borate extreme pressure additive package, and it is currently being used in a different gearbox nearby. The dependency of the kinematic viscosity on the temperature can be comparatively assessed by means of the viscosity index. Understanding the sae motor oil viscosity standard what is motor oil viscosity. Standard test method for kinematic viscosity of transparent and opaque liquids and calculation of dynamic viscosity 1 this standard is issued under the. These are the current methods for calculating the vi for petroleum products used in civil and military applications.
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