The difference between ISO 46 and AW 46 hydraulic oil is that ISO 46 defines only the viscosity grade, while AW 46 is an ISO 46 hydraulic oil that also contains anti-wear additives to protect pumps and hydraulic components.
What does ISO 46 mean in hydraulic oil?
ISO 46 refers to the viscosity grade of a hydraulic oil under the ISO viscosity grading system. It indicates that the oil has a kinematic viscosity of approximately 46 cSt at 40°C. ISO 46 does not describe the additive package or performance level, only the viscosity.
What does AW 46 mean?
AW 46 means an ISO 46 viscosity hydraulic oil formulated with anti-wear additives. These additives are designed to reduce wear in hydraulic pumps, valves, and actuators, particularly in systems operating under load or continuous duty.
Is AW 46 the same viscosity as ISO 46?
Yes. AW 46 hydraulic oil has the same viscosity grade as ISO 46. The difference lies in the formulation, as AW 46 includes anti-wear protection while ISO 46 on its own does not specify additive content.
When should ISO 46 hydraulic oil be used?
ISO 46 hydraulic oil may be used in systems where the equipment manufacturer specifies a plain hydraulic oil without anti-wear requirements. These applications are less common in modern industrial and mobile equipment.
When should AW 46 hydraulic oil be used?
AW 46 hydraulic oil is used in most industrial and mobile hydraulic systems, including pumps, presses, construction equipment, and manufacturing machinery. Anti-wear protection is commonly required by modern hydraulic components.
Do ISO 46 and AW 46 meet the same OEM requirements?
No. While both share the same viscosity grade, AW 46 hydraulic oils are more likely to meet OEM specifications that require anti-wear performance. ISO 46 alone does not guarantee compliance with equipment manufacturer requirements.
Can ISO 46 be replaced with AW 46?
In many cases, yes. AW 46 is often suitable where ISO 46 is specified because it maintains the same viscosity while adding wear protection. However, the equipment manual should always be checked to confirm compatibility.
Are AW 46 hydraulic oils suitable for industrial use?
Yes. AW 46 hydraulic oils are widely used in industrial applications due to their balance of viscosity stability, wear protection, and oxidation resistance. They are commonly selected for long-term operation in demanding environments.
How do I choose between ISO 46 and AW 46?
The correct choice depends on the equipment specification. If the manufacturer requires anti-wear performance, AW 46 should be used. If only viscosity is specified, ISO 46 may be acceptable, although many operators still choose AW 46 for added protection.
Where can ISO 46 and AW 46 hydraulic oils be sourced?
ISO 46 and AW 46 hydraulic oils are available through specialist lubricant suppliers. Sinopec hydraulic oils covering ISO 46 and AW 46 grades are available in the UK through Sinopec Online, supporting industrial and automotive hydraulic systems.
For product selection support, contact Sinopec Online or call +44 020 8068 3444