HDEO (EP) is a High Density Environmental Oil designed for applications where a specific gravity greater than seawater is required. The fluid is designed for use in a wide range of subsea and topside applications where a higher density fluid is desirable.

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Did you know...

HDEO (EP) has been used successfully in subsea projects around the globe for many years. More than 100 projects worldwide use HDEO (EP) and the fluid has been qualified by the vast majority of subsea actuator vendors.

Product Overview

HDEOEP offers outstanding environmental properties with an OCNS E (with no substitutable components) rating for UK discharge and a Yellow Y1 environmental classification for use in Norwegian waters and meets the toxicity requirements of GOM GMG290000-2012.

HDEOEP exhibits excellent corrosion protection, long term stability, microbiological protection, material compatibility and all round technical performance.

HDEOEP offers outstanding Health and Safety Properties and is classified as 'Non Hazardous' under EU legislation.

HDEOEP has been extensively tested with a wide range of materials commonly used in subsea systems and have been approved with a wide array of equipment manufacturers

Key properties

Outstanding Environmental Profile

Yellow Y1 / OCNS Class E for Discharge

Meets GOM Toxicity Requirements

Excellent Health & Safety Properties

Excellent Lubrication and Anti-wear

Excellent Anti-Corrosion Properties

Excellent Microbiological Properties

Outstanding Long Term Stability

Extensive Material Compatibility Data

Typical physical properties

Note these properties are typical for the product but do not constitute a specification.



Pour Point (C)

< -30 C

Upper Temperature (C)

180 C

Density @ 5 C

1.075 gcm

Viscosity @ 5 C

1850 cSt

Viscosity @ 40 C

182 cst

Water Solubility


Product Support

Office based technical support system

Technical support during the fluid selection process and ongoing in the field is a crucial element of our service and we are here to support you and help you make informed decisions on our products.

Product Range

We offer a wide range of environmental oil based subsea production control fluids, subsea actuator fluids and umbilical storage fluids.

We offer a wide range of environmental oil based hydraulic fluids for both topside and subsea applications to suit all budgets and applications.

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