Moontown - Seals for the CO₂ stream

Carbon Capture, Utilisation and Storage is moving from pilot schemes to full-scale infrastructure, and valves sit at the heart of it. Every stage, from capture plant to pipeline and injection well, depends on seals that keep performing in high-pressure CO₂.

CO₂ can permeate into polymer seals and then escape as pressure falls, so material choice matters from the start of a valve design. Test data lets valve manufacturers compare materials under recognised CO₂ conditions rather than relying on general chemical-resistance charts.

Moontown, a UK manufacturer of bespoke sealing solutions, has put PTFE and PEEK materials through two CO₂ test programmes.

The first was an immersion test in general accordance with API 6A (ISO 10423:2022): nine materials in 100% CO₂ at 69 bar and 25°C for 160 hours or more.

The second followed NORSOK M-710 Edition 3 and ISO 23936-1 Level 3: three PTFE compounds in 100% CO₂ at 60 bar and 97–127°C for 56 days or more.

Results relate only to the items tested, so they are a starting point for qualification, not a substitute for it. A seal also has to suit the valve around it as well as meeting the process conditions, which is why Moontown designs and manufactures our seals to each customer’s specific requirement.

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