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Hydraulic fluids play an ever-important part in commercial use, and it’s vital that you source premium quality hydraulic oil from a supplier you can trust.

When an additive company sells an additive pack, it will work alongside a particular manufacturer to create a product which works perfectly with that manufacturer’s application. This will be traceable by a hydraulic oil supplier who has used the additive in the fluid. Hydraulic oil ratings or approvals are stipulated by many end users of oil to ensure they’re using the correct fluid for their equipment.

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Under high heat, oil becomes less viscous and flows more easily, which means that it can leak or lose its required properties. Additives are used to retain viscosity for fluids used in applications involving exposure to higher temperatures.

ISO VG – ISO Grade (where ISO is the International Standards Organisation) – the higher the VG number the more viscous the fluid is. The VG number tells you which hydraulic oil is thicker. This is sometimes referred to as the hydraulic oil weight. At the same time, grades with a W next to them indicate the weight (Unlike automobile engine oil which refers to winter oil).

Give our hydraulic experts a call on 0330 123 1444 to place a hydraulic oil order with us. Available for delivery nationwide, within 48 hours of purchase, we’ll have your business well-oiled in no time.

Hydraulic fluids are used in many applications across every industry. To give you an idea of the vast array of uses for hydraulic fluid and why industrial hydraulic oil is so important, here are 10 examples of equipment and machinery which use hydraulic oil:

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‘Non-compressible’ means that the fluid cannot be compressed. Liquids are compressible to some degree, but it is incredibly negligible and not considered for our guide. In contrast, gases are compressible, and so are not used in hydraulics.

A straight paraffinic mineral base oil will typically produce a fluid with a low viscosity index, whereas a paraffinic mineral base with viscosity improvers will produce a fluid with a high viscosity index.

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To measure the change in viscosity of hydraulic oil when the temperature changes, we use the oil viscosity index (VI). If hydraulic oil has a low viscosity index, a temperature change will alter the viscosity more than if it has a high viscosity index.

When an external force is applied to the non-compressible hydraulic fluid – usually from a piston within a cylinder – the oil is pushed through the hydraulic system and ultimately produces a force on another part of the system. This results in a movement or action.

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Environmental hydraulic oil is a strong consideration for those using hydraulic machinery on farms, forests or similar environmentally sensitive sites. This is because the oil is made of a biodegradable base fluid so it will degrade naturally in the event of a spill.

For a detailed list, you can speak with our knowledgeable team by calling us on 0330 123 1444 or alternatively, you can read our explainer of hydraulic oil classifications. Find out Crown Oil’s hydraulic oil product specs.

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The hydraulic oil flash point is the lowest temperature at which enough vapours are released from the fluid which can be combustible.

Synthetic oils can be formulated to impart superior physical properties in comparison to mineral oils, for example, high-temperature performance, biodegradability and oxidation stability.

Depending on the application of hydraulic fluid, it may be subject to cold or hot temperatures. In some cases, hydraulic oil can be subjected to both hot and cold temperatures which can render the oil useless if it hasn’t been blended with the right additives.

The majority of oils which are produced are either mineral-based or synthetic. Mineral-based hydraulic oils are derived from crude oil fractions whereas synthetic hydraulic oils are made using chemically produced base fluids.

Although this useful fluid is commonly used in the transfer of power, hydraulic fluid can act as a sealant, coolant and lubricant within machinery and equipment.

The SAE (Society of Automotive Engineers) created a classification table (VI Scale) to show low to high viscosity levels depending on temperature °C. Originally the scale only went up to 100°C but with advances in hydraulic oil blends, the scale now goes above this number!

Hydraulic power is required in some of the coldest places on earth. In these cases, anti-freeze additives are used to prevent the fluid from freezing up or waxing. Low-temperature hydraulic oil is commonly used as a name for fluid which needs to be used in icy conditions.

For the varied applications of hydraulic fluid, blenders will mix the base oil with additives of different types to make the properties of hydraulic oil different.

Blenders are always trying to make hydraulic oil operate effectively over a wider range of temperatures. This means they’ll go down to low temperatures and still work as effectively as the temperature increases.

So, whether you need high-quality hydraulic oil for tractor supply, construction supply or for use in any other industry, we can supply a wide range of hydraulic fluids.

Hydraulic fluids have temperature stability which means they’ll retain their properties within a particular temperature range. Anything above or below this will negatively affect the temperature stability and cause the fluid to either wax and freeze under cold conditions or lose viscosity and potentially leak under hotter temperatures. High heat can cause rapid deterioration of hydraulic oil.

Hydraulic oil is used in many industries and in a wide variety of applications. Read our guide to hydraulic fluids to learn more.

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Hydraulic oil with a high VI will usually be required in an application which is subjected to a greater range of ambient and/or operating temperatures.

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Hydraulic oil is a non-compressible fluid that is used to transfer power within hydraulic machinery and equipment. Otherwise known as hydraulic fluid, hydraulic oil can be synthetic- or mineral-based.

Hydraulic oil is made from a variety of different ingredients, with one base fluid. These ingredients can often be mixed depending on the type of oil you require.

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Below is a list of common uses for hydraulic oil and the type of additive/s which may be added to the oil to help it perform at its optimum level.

Heavy-duty hydraulic oil is necessary for high-pressure environments where the fluid needs to be able to cope with large amounts of stress. The hydraulic oil additives used here will typically contain anti-wear properties. Anti-wear hydraulic oil is one of the most common blends used in industry and construction.

If you have any further questions about hydraulic oil not answered here, our hydraulic oil experts will be happy to help you. You can call our expert team today on 0330 123 1444 to discuss your own requirements and request a quote.

The properties and characteristics of any hydraulic oil are vitally important to the capability of your hydraulic system to work within the operating conditions you need to use it in. This is especially true of industrial or commercial hydraulic oils.

The viscosity of hydraulic oil and temperature is closely linked. As temperature increases, the viscosity of the oil will decrease – a bit like when you put cooking oil in a cold pan it moves slowly but when the pan heats up the oil moves around very quickly and with ease. As the temperature drops hydraulic oil will become more viscous.

This works by sending a sample of the hydraulic oil to a lab which analyses the sample and reports back with details as to whether it’s good to use further or if it needs to be changed. This gives the end user reassurance that it is still usable and no damage can be done to expensive equipment due to dirty or worn oil.

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This chart should be read horizontally. It assumes 96 VI single-grade oils. The equivalence is in terms of viscosity at 40°C only. Viscosity limits are just approximate; for precise data then you should consult your supplier, ISO, AGMA and SAE specifications. W grades are represented only in terms of approximate 40°C viscosity. For low-temperature limits, consult SAE specifications.

In the UK, ISO VG is used mainly for grading hydraulic oil. Below is a list of common hydraulic oil ISO grades and a general guide to their applications:

These additives are used on their own and together in different blends which are created for different purposes. Hydraulic oil properties can be altered depending on which additives are used, but the typical characteristics tend to be a high viscosity index and be incompressible.

When it comes to hydraulic oils, viscosity is the measurement of its resistance to flow and it is an important property of hydraulic fluids. This means the fluid will resist compression at different rates depending on its viscosity and take longer to pass through an orifice as the viscosity increases. Hydraulic fluid with high viscosity will be thicker and harder to compress and move as opposed to low viscosity hydraulic oil which will be thinner and pass through easier.

Few, if any, fluids perfectly meet the above criteria. However, there is a comprehensive range of hydraulic oils that specialise in meeting the above properties for the set of conditions in which they are required to operate. Those conditions can range from being required to operate in low temperatures (winter hydraulic oil), high temperatures and a variety of others.

The viscosity of a hydraulic fluid is measured in Centistokes (cSt) and usually at temperatures of 40°C or 100°C. The value will always have the temperature next to it as without this the value will be meaningless. A fluid’s viscosity is measured in a lab using a viscometer as pictured below!

Usually applying force to material results in compression, so you may be wondering whether hydraulic oil is compressible or not, but a key property of hydraulic fluids is that they must be non-compressible.

Biodegradable hydraulic oil is used in applications where an oil spill or leak could potentially contaminate the environment. The typical base oil for biodegradable versions of hydraulic oil includes rapeseed oil and some other vegetable oils.

If you’ve ever felt the pressure of choosing the right hydraulic oil for your machinery, you’ll know all too well the minefield of information that’s out there in books or online. Instead of getting lost in the world of hydraulic fluid, hydraulic liquids or hydraulic lubricants, why not take a look at our easy-to-follow guide to hydraulic oil? It’s everything you need to know about hydraulic oils!

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Please note that the above examples are just a rough guide and some grades may cross over. It is always best to check with your supplier or manufacturer!

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Commonly known as condition monitoring, a hydraulic oil analysis service is used by people who want the most out of their oil before they have to change it in their hydraulic application.

The key role of hydraulic oil in a hydraulic system is to transfer power from one end of that system to another end through and the various hydraulic components.

Depending on how you use our hydraulic oil, there will be extra additives which help it perform under different conditions.