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.
Available by Request for Quote Only
HOUGHTO-SAFE® 620 E is a safety-critical fire resistant hydraulic fluid. Contact Orbit Industrial for pricing, availability and technical support across Cape Town, Saldanha Bay, Durban and Port Elizabeth.
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
Request a Quote — HOUGHTO-SAFE® 620 E
Premium ISO HFC fire resistant hydraulic fluid. Vickers and Bosch Rexroth approved. Over 50 years the global benchmark. Available in 20L. Contact Orbit Industrial for pricing and technical support.
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