This is called centistokes, which we have already noted. This would reflect an order of center point uncertainty in calculations similar to that imposed by dimensional manufacturing tolerances. The effective corrosion inhibitor provides additional protection for metal components. This property is called absolute viscosity also known as dynamic viscosity and is measured in centipoises cP. The fluid gets thicker at lower temperatures and it gets thinner at higher temperatures.Next
Viscosities are defined or assigned using a laboratory device called a viscometer. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. These scientifically engineered synthetic lubricants are formulated from synthetic base fluids that have exceptional oxidation and thermal properties and excellent low temperature fluidity. Care should be taken to make sure the two types of fluids are not mixed. The oil is contributing to extension of the lifetime of particle filters. At least for automotive oils, we can expect to continue to see the 10- 20- 30- 40- 50- values used.Next
In addition suitable for other hydraulic systems where a clean, non-staining hydraulic oil is desired. The viscosity of each grade ranges ± 10 % from the mid-point. A study of possible temperatures indicated that 40ºC 104ºF was suitable for the industrial-lubricant classification as well as for the lubricant-definition properties mentioned above. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities. For the practitioner of industrial lubrication, the centistoke is the measure that will occupy most of our attention.Next
These benefits include longer grease life, enhanced bearing protection and bearing life, wide temperature range of application, and the potential for improved mechanical efficiency and energy savings. Formulations are subject to change at any time. This points to the need for a universally accepted viscosity designation - one that can be used by lubrication practitioners, lubricant suppliers and machinery design engineers simultaneously with minimal confusion. Other factors include the type of base oil and the additives with which the lubricant is formulated. Some of our calculators and applications let you save application data to your local computer. If a machine is heavily loaded then the machine designer will use a lubricant that resists being pushed around, which would be heavy like honey.
This classification applies mainly for use with industrial lubrication. The Mobil Vactra Oil Numbered Series provides separability from many water and aqueous coolants reducing the potential negative effects of cross contamination which helps to enhance the service life and performance of both the lubricant and coolant. Further, there is no intention to offer quality definition of lubricants with this scale. It has been formulated to withstand heavy loads ans severe conditions resulting in very good micro pitting resistance. If the practitioner is comfortable with one particular measure but would like to see the correlating viscosity range in another measure, all he must to do is place a straight horizontal line through his chosen viscosity type and see its correlation within the other types of measures. The division of each decade into six equal logarithmic steps provides such a system and permits a uniform progression from decade to decade.Next
As the fluid gets thicker - a function of its increasing resistance to flow - then it takes progressively longer to move through the tube funnel. Given all of these variables and details, several organizations decided to come up with a way to characterize lubricating oils so that members of their respective organizations would have a uniform and simple way to communicate, educate and ultimately protect their interests. The step inbetween two subsequent viscosity grades is approx. This product is designed to extend bearing life under conditions of extremely slow speeds, sliding contacts, and high temperatures. To address the issue of micropitting wear, our product formulation scientists designed a proprietary combination of additives which would resist traditional gear wear mechanisms as well as protecting against micropitting. Reduced fluid friction produces lower operating temperatures and can help improve gear efficiency. These applications will - due to browser restrictions - send data between your browser and our server.Next
The classification is based on the principle that the midpoint nominal kinematic viscosity of each grade should be approximately 50 percent greater than that of the preceding one. The other consideration is how the fluid behaves only under the force of gravity. For lubricating oils, viscometers tend to operate by gravity rather than pressure. This is similar to the amount of time it takes a specific volume of fluid at a specific temperature to drain through a funnel. The Mobil Vactra Oil Numbered Series has been developed and specifically designed to provide an extra margin of machinery protection by satisfying the stringent demands of slide ways. Another important property is it is 100% compatible with petroleum based oils.Next
The reference temperature for the classification should be reasonably close to average industrial service experience. If the machine runs very fast then the machine designer will specify a lubricant that can get out of the way, and back into the way just as quickly. Use the following chart to better understand the relationship of the viscosity measurement scales only. Think of a kinematic viscometer as a long glass tube that holds a volume of oil. To the new entrant into the lubrication field, the number of options can be confusing, particularly if the primary lubricant supplier does not associate one of the prominent viscosity systems to the product label.