Description

Stauffer Fyrquel 550 Hydraulic Fluid is a high-performance, phosphate ester-based fire-resistant hydraulic fluid designed for demanding industrial applications. Its primary value lies in providing superior fire safety and thermal stability in high-risk environments where conventional petroleum-based fluids pose a significant hazard. This product is essential for industries requiring reliable hydraulic power transmission under extreme conditions, such as steel mills, die-casting operations, and power generation plants. It offers excellent lubricity and corrosion protection, ensuring long-term system reliability and reduced maintenance costs.

Application

• Primary hydraulic fluid in steel and aluminum mill machinery, including continuous casters and rolling mills.
• Fire-resistant hydraulic systems in die-casting and foundry equipment operating near molten metal.
• Industrial turbine control and electro-hydraulic control (EHC) systems in power generation facilities.
• Hydraulic systems for mining equipment and underground machinery where fire safety is paramount.
• High-temperature hydraulic applications in plastic injection molding and extrusion presses.
• Hydraulic fluid for aerospace ground support equipment (GSE) and testing rigs.
• Use in naval and marine hydraulic systems where fire resistance is a critical safety requirement.

Basic Information

Product Name	Stauffer Fyrquel 550 Hydraulic Fluid
CAS No.	58517-71-8
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Fyrquel 550; Triaryl Phosphate Ester; Fire-Resistant Hydraulic Fluid 550; Phosphate Ester Hydraulic Fluid; Triaryl Phosphate; Lubricant, fire-resistant; Hydraulic Fluid, Fire-Resistant; TCP (Tri-Cresyl Phosphate) type fluid
EINECS	Contact for details

Quality Control

Our Stauffer Fyrquel 550 Hydraulic Fluid is manufactured under strict quality management systems to ensure batch-to-batch consistency and performance. The product is tested against key industry specifications for fire resistance (e.g., Factory Mutual (FM) Approval Standard 6930), viscosity, acid number, and oxidation stability. Certificates of Analysis (COA) documenting these parameters are available upon request to verify compliance with your specific technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from strong acids, organic solvents, and sources of ignition. To prevent oxidation, minimize exposure to air and moisture. Recommended storage temperature is between 15°C and 25°C (59°F and 77°F). Keep containers tightly sealed when not in use.

Specification

Item	Specification
Appearance	Clear, pale yellow liquid
Identification (IR)	Conforms to standard
Viscosity @ 40°C, cSt	Contact for details
Viscosity Index	Contact for details
Flash Point (COC), °C	> 240
Fire Resistance	Passes industry spray ignition tests
Acid Number, mg KOH/g	< 0.10
Density @ 20°C, g/mL	Contact for details
Water Content, %	< 0.10

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.