Mobil Pyrogard 53

Specifications

Brand

Mobil (ExxonMobil)

Range

Mobil Pyrogard

Category

Hydraulic oils

Viscosity

ISO VG 46

Manufacturer code

201560106008

Availability

On request

Typical characteristics

Manufacturer's description

Mobil Pyrogard 53 is a high-performance phosphate ester synthetic fluid designed to replace petroleum-based oils in hydraulic applications where operating conditions preclude the use of combustible mineral products. It is approved by Factory Mutual (FM) as a fire-resistant fluid, offering excellent resistance to oxidation at typical hydraulic system temperatures for long service life without harmful sludge formation, plus good antifoam behaviour and ready separation from water. The fluid provides good anti-wear protection for high-pressure, high-output hydraulic pumps and is highly resistant to shear, retaining its viscosity throughout its service life, while also delivering long-term rust protection when water contamination is controlled. Its specific gravity is greater than water, so any water contamination floats to the reservoir surface for easy removal, though this higher density must be factored into system design and maintenance. Compatible seal and bladder materials include butyl rubber, silicone, Teflon and Viton; systems converting from mineral oil should have paint fully removed from the reservoir or suction screens cleaned frequently, and must be thoroughly drained and flushed, as water-glycol and emulsion fluids are not compatible. Mobil Pyrogard 53 is recommended for hydraulic applications requiring fire-resistant fluids, particularly in metal smelting and hot-working plants at higher fire risk, including aluminium die-casting machines, tilting systems of cast iron induction melting furnaces, and various steel industry applications. Typical properties include a kinematic viscosity of 41.8 mm²/s at 40°C and 5.1 mm²/s at 100°C, autoignition temperature of 538°C, flash point of 246°C, and specific gravity of 1.155.

Applications

• Hydraulic applications where fire-resistant type fluids are required, particularly in plants where metals are smelted or hot-worked, which are most at risk of ignition and often have a history of hose and component leakage.
• Aluminium die-casting machines.
• Tilting systems of cast-iron induction melting furnaces.
• Various steel-industry applications where fire hazard is a key concern.
• Seal and accumulator-bladder materials must be compatible with the fluid — butyl rubber, silicone, PTFE, Viton or equivalent materials are generally satisfactory; consult the equipment or seal supplier for specific recommendations.
• Many paints, coatings and some plastics are not suitable for use with this fluid; consult the coating manufacturer before use, and when converting from petroleum oil, remove paint from the reservoir or clean suction screens frequently.
• Not compatible with water-glycol and emulsion-type fluids; systems must be thoroughly drained and flushed before installing a new charge.

Performance & benefits

• Approved as fire-resistant by the Factory Mutual group.
• Excellent fire resistance increases safety in fire-sensitive applications.
• Outstanding anti-wear properties give long life to pumps, motors and valves, with reduced parts-replacement costs.
• Excellent oxidation stability and sludge resistance extend fluid life and give long filter life.
• Long-term rust protection in service gives problem-free hydraulic-system operation and reduced downtime.
• Highly resistant to viscosity shear breakdown, retaining viscosity over the fluid's life for smooth, efficient and reliable operation.
• Good antifoam and water-separation properties avoid excessive water contamination and erratic operation from foamy oil, lowering operational costs.