ENVIROSOL CLEO is our super HP/HT subsea control fluid capable of long term service at temperatures as high as 250 °C / 482 °F.

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Did you know...

CLEO has been qualified with a very wide range of subsea equipment including DCV's, DHSV's, Steel Line and Thermoplastic Umbilicals.

Product Overview

ENVIROSOL CLEO is designed for use as a subsea production control fluid in both open (discharge to sea) and closed (return) systems.

​ ENVIROSOL CLEO has a wide operational temperature range (between -45 °C to 250 °C / 482 °F) and is qualified across a wide range of industry equipment and to industry standards.

ENVIROSOL CLEO also boasts a massive compatibility dataset in relation to metals and elastomers, making it suitable for both Ultra HP/HT and more conventional subsea projects.

This low viscosity environmental oil demonstrates excellent lubricity/anti-wear, corrosion protection, freeze protection, hydrate protection, stability and all round technical performance.

ENVIROSOL CLEO is environmentally acceptable for use in OSPARCOM countries, boasting a 'Yellow' status (Norway), an OCNS Class E (UK) and meets GOM toxicity requirements.

Key properties

Wide Temperature Range (-45 °C to 250 °C / 482 °F)

Excellent Lubrication and Anti-wear Properties

Excellent Anti-corrosion Properties

Outstanding Environmental Properties

Yellow / OCNS E for Discharge

Meets toxicity requirements for GOM

Protection Against Vapour Phase Corrosion

Outstanding Long Term Fluid Stability

Extensive Material & Equipment Qualification

Typical physical properties

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



Pour Point (C)

< -40 C

Upper Temperature (C)

250 C

Density @ 5 C

0.925 gcm

Viscosity @ 5 C

27.5 cst

Viscosity @ 40 C

8.5 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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