Fluids for hydraulic system
Hydraulic systems, or more precisely hydrostatic systems, transmit mechanical energy from one point of a plant to another using the pressure exerted on a fluid. The fluids used in such a plant must therefore flow easily, limit friction and prevent wear. The choice ofthe fluid depends on the type of use, on the operating conditions and on the characteristics of the components of thehydraulic system.
chemical and physical properties
viscosity
The physical “size” of a fluids, defined as the intrinsic resistance to flow, measured by the dynamic viscosity. The ISO VG viscosity grade must be chosen on the basis of the pump and/or plant manufacturer’s instructions, taking into account, of the operatingtemperature of the system and the ambient temperature at starting and in service.
viscosity index
Viscosity depends on temperature (it reduces with an increase in temperature) and the parameter that measures this variation is called the viscosity index. The higher the index the more constant the fluid maintains its level of viscosity with variations in temperature. The hydraulic fluids in current usage have viscosity indices of about 100, but there are mineral hydraulic oils containing special polymers with indices greater than 140-150 and synthetic oils with viscosity indices of between 130 and 190.
antirust and anticorrosion capacity
The capacity of the hydraulic fluid to protect internal metallic surfaces from chemical attack by extraneous substances, primarily water and oxygen but also acidic substances. These properties are obtained by the addition of special polar or passive additives that act by adhering to the metallic surfaces and forming a protective layer.
oxidation stability
The resistance of the oil to react with oxygen. Antioxidant additives increase this capacity considerably, which reduces the effects of oxidation (formation of acids, sludge, etc.) and also considerably increases the life of the lubricant in use. In general synthetic oils possess an intrinsically higher oxidation stability.
thermal stability
The intrinsic resistance of the oil to form sludge and carbonaceous deposits when it is subjected to high thermal stress. The chemical nature of the oil (mineral or synthetic) has a predominant influence on this property.
mineral hydraulic fluids AGIP OSO D are detergent/dispersant type hydraulic fluids with the ability to emulsify water, which has infiltrated into the hydraulic circuit. Suitable for cutting machines.AGIP OSO DAGIP RADULAAGIP RADULA are pure mineral oils for use as hydraulic fluids for light applications.AGIP ACERAGIP ACER are quality lubricants with antioxidant and antirust additives (R&O oils) for use as functional fluids for oleodynamic circuits where there are no problems of wear.AGIP OSOAGIP OSO are high quality lubricants designed to be used as functional fluids in all types of hydraulic systems and plants. They are blended from high quality paraffin bases with antirust, antioxidant and antiwear additives. AGIP OSO conform to the following classifications and specifications and/or are approved by the following international organizations or manufacturers:> ISO-L-HM> ISO 11158> AFNOR NF 48603 HM> BS 4231 HSD> DIN 51524 TEIL 2 HLP> VDMA 24318AGIP OSO SAGIP OSO S are superior quality ashless hydraulic oils suitable for the lubrication of hydraulic equipment and systems. They areformulated from highly selected paraffin bases and additives which confer excellent antiwear, filterability, antirust and antioxidantproperties to the product.> ISO-L-HM> ISO 11158> AFNOR NF 48603 HM> BS 4231 HSD> DIN 51524 TEIL 2 HLP> PARKER HANNIFIN (DENISON) HF-0
demulsivity
Demulsivity is the ability of the oil to release water and is closely dependent on the nature of the original crude and on the refining process. Demulsivity can also be partially improved by special additives and is generally reduced by the presence of contaminants.
antiwear property
The ability of the fluid to limit wear. It is obtained by specific additives in the oil that drastically reduce the mechanical wear of the components in circuits where there are sliding contacts (vane pumps). This characteristic is generally evaluated bytribological tests, such as 4 balls wear and “FZG”, and by bench top tests with the hydraulic pumps of leader manufacturers(Eaton-Vickers and Denison).
filterabilit
The evaluation of the tendency of an oil to leave deposits and/or form emulsions that may block filters. This property is assessed in the presence or in the absence of water
compatibility with rubbers
Elastomeric (rubber) components (washers and flexible parts) must be compatible with the oil in circulation in order to avoid their rapid failure. The degree of compatibility between the elastomer and the oil depends on their relative chemical compositions. All AGIP hydraulic fluids are compatible with the elastomers in current use (nitrile, silicone, fluorocarbon, and acrylic rubbers).
mineral hydraulic fluids
AGIP OSO D are detergent/dispersant type hydraulic fluids with the ability to emulsify water, which has infiltrated into the hydraulic circuit. Suitable for cutting machines.
AGIP OSO D
AGIP RADULA
AGIP RADULA are pure mineral oils for use as hydraulic fluids for light applications.
AGIP ACER
AGIP ACER are quality lubricants with antioxidant and antirust additives (R&O oils) for use as functional fluids for oleodynamic circuits where there are no problems of wear.
AGIP OSO
AGIP OSO are high quality lubricants designed to be used as functional fluids in all types of hydraulic systems and plants. They are blended from high quality paraffin bases with antirust, antioxidant and antiwear additives.
AGIP OSO conform to the following classifications and specifications and/or are approved by the following international organizations or manufacturers:> ISO-L-HM> ISO 11158> AFNOR NF 48603 HM> BS 4231 HSD> DIN 51524 TEIL 2 HLP> VDMA 24318
AGIP OSO SAGIP OSO S are superior quality ashless hydraulic oils suitable for the lubrication of hydraulic equipment and systems. They areformulated from highly selected paraffin bases and additives which confer excellent antiwear, filterability, antirust and antioxidantproperties to the product.> ISO-L-HM> ISO 11158> AFNOR NF 48603 HM> BS 4231 HSD> DIN 51524 TEIL 2 HLP> PARKER HANNIFIN (DENISON) HF-0
fluids for hydraulic system
AGIP ARNICA are superior quality mineral antiwear hydraulic oils, with a very high viscosity index, developed to satisfy the needs of modernoleodynamic plants that operate in the severest conditions. The products of the AGIP ARNICA series are characterised by a high antiwear capacityand by an excellent thermo-oxidative stability, ensure prompt de-emulsification, rapid release of entrained air, high flash point and excellent filterability;the compatibility of the fluid with rubber and paints and its resistance to chemical attack, also guarantees the complete protection of the componentsof the circuit. Their performance places AGIP ARNICA at the top in the field of hydraulic oils. AGIP ARNICA are also suited to work in the most severe conditions, as demonstrated by tests carried out on piston and vane pumps made by the major manufacturers, such as Eaton-Vickers and Denison. AGIP ARNICA conform to the following classifications and specifications and/or are approved by the following bodies or manufactures.
> ISO-L-HV> ISO 11158
> AFNOR NF 48603 HV
> BS 4231 HSE
> DIN 51524 TEIL 3 HVLP
> ATOS TAB. P 002-0/I
> CINCINNATI P-68, P-69 AND P-70
> COMMERCIAL HYDRAULICS
> PARKER HANNIFIN (DENISON) HF-0
> EATON VICKERS M-2950
> LINDE> REXROTH RE 90220-1/11.02
> SAUER-DANFOSS 520L0463
AGIP ARNICA DV is detergent/dispersant high viscosity index type hydraulic fluid with the ability to emulsify water, which has infiltrated into the hydraulic circuit. It is particularly suitable for use in ceramic industry presses and in machine tools that operate with aqueous fluids.
AGIP EXIDIA HG are specific fluids developed for machine tools, where one product is needed for lubricating the guide and for driving the oleodynamic controls.
PRODUCTS CLASSIFICATION STANDARD DIN ISO
AGIP RADULA ISO-L-HH ISO 11158 DIN 51502 H
AGIP ACER ISO-L-HL ISO 11158 DIN 51524 PART 1 HL
AGIP ARNICA SAGIP ARNICA S are hydraulic fluids formulated from synthetic esters bases. AGIP ARNICA S are characterised by a particularly high viscosity index and an extremely high flash point, properties which make these oils suitable for use in plants exposed to fire danger; additionally, they are biodegradable and thus suitable where there is a risk of leaks, that may pollute the environment.
AGIP OSO ISO-L-HM ISO 11158 DIN 51524 PART 2 HLP
AGIP OSO S ISO-L-HM ISO 11158 DIN 51524 PART 2 HLP
AGIP OSO D ISO-L-HM (*) ISO 11158 DIN 51524 PART 2 HLPD
AGIP ARNICA DV ISO-L-HV (*) ISO 11158 DIN 51524 PART 2 HVLPD
AGIP ARNICA ISO-L-HV ISO 11158 DIN 51524 PART 3 HVLP
AGIP EXIDIA HG ISO-L-HG ISO 11158 DIN 51502 HG
AGIP ARNICA S are hydraulic fluids formulated from synthetic esters bases. AGIP ARNICA S are characterised by a particularly high viscosity index and an extremely high flash point, properties which make these oils suitable for use in plants exposed to fire danger; additionally, they are biodegradable and thus suitable where there is a risk of leaks, that may pollute the environment.
AGIP ARNICA PSX is a totally synthetic very high performance fluid with antioxidant, antirust, antiwear and detergent/dispersant additives specifically formulated for presses used in the ceramics industry. The interval replacement in systems in which it is used may be considerably extended due to the very high resistance to oxidation.
AGIP ARNICA 104 FR is a special non-flammable biodegradable fluid characterised by high viscosity index and low stick-slip point, conforming to the needs of the hydraulic circuits of industrial machinery. It is composed of a propylene glycol/water solution with anticorrosive additives.
PRODUCTSBASE CLASSIFICATION STANDARD APPLICATIONS TYPE ISO
AGIP ARNICA S ESTER ISO-L-HFDU ISO 12922 FIRE RESISTANTISO-L-HEES ISO 15380 ACCEPTABLE TO THE ENVIRONMENT
AGIP ARNICA PSX PAO ISO-L-HS – CERAMIC PRESSES
AGIP ARNICA 104 FR GLYCOL + WATER ISO-L-HFC ISO 12922 FIRE RESISTANTISO-L-HEPG ISO 15380 ACCEPTABLE TO THE ENVIRONMENT
PRODUCTS BASE TYPE APPLICATIONS CHARACTERISTICS
AGIP ARNICA A 15 mineral gate opening mechanisms very high viscosity index
AGIP ARNICA ABX 15 pao/ester gate opening mechanisms very high viscosity index, biodegradable
AGIP ARNICA SA mineral shock absorbers avoid stick-slip phenomena,(series of products) good antiwear characteristics
AGIP SP 7734 – SP 7735 – natural environmental biodegradable according to
SP 7736 esters pollution risks method OECD 301b
ISO VG VISCOSITY 15 22 32 46 68 100 150 PRODUCT
AGIP RADULA X X X X X
AGIP ACER X X X X X X
AGIP OSO X X X X X X X
AGIP OSO S X X X
AGIP OSO D X X
AGIP ARNICA X X X X X X
AGIP ARNICA DV X
AGIP ARNICA S X X
AGIP ARNICA PSX X
AGIP ARNICA 104/FR X
AGIP ARNICA A 15 X
AGIP ARNICA ABX 15 X
AGIP EXIDIA HG X X
AGIP SP 7734 – SP 7735 X X
AGIP SP 7736 X
AGIP hydraulic fluids have particular characteristics which make them suitable for several applications as illustrated in the following table:international classification and properties ISO CLASSIFICATION PROPERTY PRODUCTS
HH straight mineral oil AGIP RADULA
HL antirust and resistant to oxidation AGIP ACER
HM antiwear AGIP OSO – AGIP OSO S
HM antiwear + detergent (*) AGIP OSO D
HV antiwear + detergent and HVI (*) AGIP ARNICA DV
HV antiwear and high viscosity index AGIP ARNICA
HG HM + anti stick-slip characteristics AGIP EXIDIA
HG HS long life synthetic oil AGIP ARNICA PSX
HFC fire resistant AGIP ARNICA 104 FR
HFDU fire resistant AGIP ARNICA S HEES acceptable for the environment AGIP ARNICA S
HETG acceptable for the environment AGIP SP 7734 – SP 7735 – SP 7736
HEPG acceptable for the environment AGIP ARNICA 104 FR
HEPR acceptable for the environment AGIP ARNICA ABX 15(*) detergent oils are not covered by ISO.