(Subsea Production Control Fluids)

High-performance, high-temperature water-based hydraulic fluids with an operational temperature range from -25°C to 145°C (-13°F to 293°F). Oceanic HW 443 fluids are used in open and closed loop Subsea Production control systems. Oceanic HW 443 fluids are compatible with each other and offer the same great technical performance. Products differ only in colour (HW 443 fluorescent yellow, HW 443 ND no dye clear amber and HW 443 R fluorescent red).

Key Benefits

  • Maximum operation temperature 145°C/293°F
  • Excellent corrosion protection (liquid & vapour phase) and lubrication properties
  • Resistant to microbial infection
  • Recommended for long-term equipment storage
  • Outstanding stability with high levels of seawater ingress
  • Fully compatible with Oceanic HW 500 Series, HW 500 P Series, HW 700 Series & XT 900
  • Meets stringent global environmental acceptability requirements
  • Manufactured to NAS 1638/AS 4059 class 6/6b-f or better cleanliness. Filtration is required to maintain fluid cleanliness
  • ISO13628-6 specified, approved for use by all major equipment manufacturers
  • Free Fluid Monitoring programme ensures lasting service life
Typical Physical PropertiesOceanic
HW 443
HW 443 ND
HW 443 R
AppearanceFluorescent Yellow FluidClear Amber FluidClear Fluorescent Red Fluid
Specific [email protected]°C1.071.071.07
Pour Point<-25°C (-13°F)-25°C (-13°F)<-25°C (-13°F)
Kinematic Viscosity (cSt)
-20°C (-4°F)
0°C (32°F)
40°C (104°F)
Mobile at<-35°C (-31°F)<-35°C (-31°F)<-35°C (-31°F)

Environmental Information

MacDermid maintains worldwide environmental approvals and can offer Oceanic Subsea Production control fluids suitable for use in every exploration and production region around the world. The current environmental status of Oceanic HW 443 fluids in your area can be obtained from our environmental specialists.


Oceanic HW 443 fluids should be stored in dry conditions, ideally out of direct sunlight. Normal storage temperature range is 5 to 40°C.

Material Compatibility

Oceanic HW 443 fluids contain performance additives which ensure high levels of compatibility with materials typically used in subsea production control equipment. Extensive material compatibility tests have been performed with Oceanic HW 443 fluids.

Ferrous metals (cast iron, carbon steel, low & high alloy steels, stainless steels…)Compatible
Non-ferrous metals (copper, brass, bronze and other metals and alloys*)…Compatible with alloys typically used in subsea production control equipment.
Avoid Zn, Cd, Pb and Mg metals. Aluminium should be hard anodised.
Coatings and ceramic materials Avoid porous coatings. Compatible with most ceramic parts. Check ceramic coatings.
Packaging & sealing materials
(elastomers and thermoplastics*)
Compatible with standard NBR, HNBR, FFKM, VMQ/FMVQ, CR, TFE/PTFE, PEEK.
Some FKM & AU/EU/PU have proven to be incompatible.
Umbilical hose liner thermoplasticsCompatible with Nylon 11, PE and Polyether ester copolymers.
Absorbent gasket materialsAvoid cork, leather, cotton impregnated materials.
PaintsAvoid painting internal surfaces
Cured epoxy, phenolic and nylon based paints are satisfactory. Avoid less resistant paints as they soften. Wash spillages immediately with water.
Filter elementsPolypropylene and glass fibre filter elements recommended over paper filters.
*As material compatibility varies from compound to compound and supplier to supplier, consult supplier for recommendations or request specific compatibility tests.

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