HOUGHTO-SAFE 620 E | Fire-resistant hydraulic fuid

HOUGHTO-SAFE® 620 E — Fire Resistant Hydraulic Fluid (ISO HFC Water Glycol)

HOUGHTO-SAFE® 620 E is Quaker Houghton's premium performance, water-containing synthetic fire resistant hydraulic fluid — classified ISO 6743-4 Type HFC. For over 50 years it has set the global benchmark for fire resistant hydraulic fluid performance in steel production, aluminium manufacturing, pressure die-casting, glassmaking, polymer forming, offshore platforms and any high-fire-risk hydraulic application where mineral oil presents an unacceptable ignition risk.

HOUGHTO-SAFE® 620 E greatly reduces the risk of hydraulic fire where equipment operates near open flames, hot surfaces or molten metals — delivering the balanced combination of fire resistance, outstanding lubrication and comprehensive corrosion protection that safety-critical industrial and offshore hydraulic systems demand.

Supplied through Orbit Industrial as an authorised Quaker Houghton distributor. Available in 20L. Available by request for quote only — not available for direct checkout.

Product Data Sheet

Why HOUGHTO-SAFE® 620 E is the Global HFC Benchmark

Introduced over 50 years ago and continuously developed, HOUGHTO-SAFE® 620 E has set the performance standard by which all other water-glycol fire resistant hydraulic fluids are measured. Its unique EMEA and APAC formulation delivers outstanding pump test performance — passing ISO 20763 in a Vickers V104 Vane Pump with less than 100mg weight loss at 140 bar, where many competing water glycols fail. Approved by Vickers, Bosch Rexroth and — in selected formulations — Factory Mutual, it is the trusted global choice for the most demanding fire resistant hydraulic applications.

Features & Benefits

Feature	Advantage & Operational Benefit
ISO 6743-4 Type HFC — water-containing synthetic	Classified fire resistant hydraulic fluid — direct replacement for mineral oil in high-fire-risk hydraulic systems without compromising overall system performance
No flash point or fire point	Eliminates the ignition risk of mineral oil-based hydraulic fluid in environments with open flames, hot surfaces above 250°C or molten metal splash — the highest level of fire protection available in a hydraulic fluid
Passes spray ignition tests — CEC Luxembourg, Factory Mutual, ISO 15029	Certified fire resistance across multiple international standards — accepted by insurers, plant safety authorities and OEM approval bodies globally
Passes ISO 20763 — Vickers V104 Vane Pump test, <100mg wear at 140 bar	Outstanding anti-wear performance where many water-glycol competitors fail — extended pump and component life reduces maintenance and replacement costs
Vickers and Bosch Rexroth approved	OEM approval from the world's two largest hydraulic component manufacturers — ensuring pump, valve and actuator warranty compliance when switching from mineral oil
High viscosity index — wide temperature range operation	Maintains consistent viscosity and performance across the full operating temperature range of industrial and offshore hydraulic systems — from cold start to sustained high-load operation
Low pour point — cold weather stability	Reliable cold-temperature performance for offshore and industrial applications in variable or cold ambient conditions — no cold-start hydraulic sluggishness
Passes ISO 4404-1 corrosion tests	Compatible with steel, copper, brass and anodised aluminium — covers the full range of materials used in hydraulic system construction without corrosion risk
Vapour phase corrosion protection additives	Protects partially filled tanks and system components above the fluid line from vapour-phase corrosion — a common failure mode in water-glycol systems not addressed by competing products
May reduce insurance premiums	The switch from mineral oil to HOUGHTO-SAFE® 620 E in fire-risk environments is recognised by insurers — potentially reducing property insurance premiums for industrial and offshore facilities

Typical Properties

Property	Test Method	Value
Fluid Classification	ISO 6743-4	HFC — Water Glycol
Kinematic Viscosity @ 40°C (cSt)	ASTM D-445	~39
Flash Point	ASTM D-92	None (water-based)
Fire Point	—	None
Pump Test — Vickers V104	ISO 20763	<100mg wear @ 140 bar
Corrosion Test	ISO 4404-1	Pass
Spray Ignition	CEC / FM / ISO 15029	Pass
Metal Compatibility	ISO 4404-1	Steel, copper, brass, anodised aluminium
OEM Approvals	—	Vickers, Bosch Rexroth
Use	—	As supplied — no dilution required

Applications

• Steel production — hydraulic systems adjacent to molten metal, furnaces and hot rolling operations
• Aluminium production — die-casting machinery, extrusion presses and foundry hydraulic equipment
• Glassmaking — hydraulic systems in the vicinity of furnaces and forming operations
• Polymer forming — injection moulding machinery and extrusion equipment in high-temperature environments
• Offshore platforms — platform hydraulic systems requiring fire resistant fluid in compliance with SOLAS and offshore safety regulations
• Marine fire safety systems — vessel hydraulic systems in engine rooms and high-temperature areas
• Mining — hydraulic systems in underground mining environments where fire risk and water-based fluid requirements apply
• Any industrial hydraulic system where mineral oil presents an unacceptable fire, explosion or insurance risk

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