ENVIROSOL CO250 is a CO2 compatible Subsea Control Fluid offering excellent corrosion protection and fluid stability in EOR/ CCS subsea systems.  ENVIROSOL CO250 also doubles as a SURF Compatible Umbilical Storage Fluid.

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Did you know...

CO2 corrosion in systems containing water can be extremely aggressive with 500ppm of water present enough to cause corrosion in pipelines. ENVIROSOL CO250 is fully Compatible with CO2, contains no water and therefore does not form Carbonic Acid.

Product Overview

ENVIROSOL CO250 has an extremely low viscosity but does not contain water hence cannot react with CO2 to form Carbonic acid or form CO2 gas hydrates.

ENVIROSOL CO250 is based on environmentally acceptable ‘oils’, boasting an OCNS Class E for UK use, a Yellow Y1 Classification for Norway and can be used in open/ vent to sea or closed/return systems. To assist with our Carbon Offsetting programme, we pledge to plant a tree for every 5 litres of fluid sold.

ENVIROSOL CO250 has an upper temperature capability of 250°C.

This combination of environmental, futuristic, technical and performance attributes makes ENVIROSOL CO250 an ideal Subsea Control Fluid for all manner of traditional open/closed subsea projects along with EOR/CCS, while offering dual function as an extremely stable umbilical storage fluid that can offer significant savings during umbilical commissioning due to its superior compatibility with SURF (Subsea, Umbilical, Riser, Flowline) chemicals.

Utilising CO250 in a standard subsea control system also makes sense if there is any likelihood that the subsea system might be converted to CO2 EOR or CCS in the future (plug and play forward compatibility).

Key properties

Fully Compatible with CO2

Does not contain water hence does not react with CO2 to form Carbonic Acid

Viscosity similar to water based fluids

Wide Temperature Range (-40°C to 250 °C / 482 °F)

Excellent Lubrication and Anti-wear Properties

Excellent Anti-corrosion Properties

Outstanding Environmental Properties

Yellow /Y1 / OCNS E for Discharge

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 (-40 F)

Upper Temperature (C)

250 C (482 F)

Specific Gravity


Viscosity @ 5 C

10.5 cSt

Viscosity @ 20 C

6.5 cSt

Viscosity @ 40 C

3.9 cSt

Water Solubility


Oil Solubilty


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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