To enable the uptake of green hydrogen we provide safe, lightweight, cost-effective pressure vessels
About us
CST Optimum is a world-leading supplier of certified composite overwrapped pressure vessels (COPVs) for use in the energy, transport, aerospace, and defence sectors. We are an international joint venture between CST Composites (Australia) and Optimum Composite Technologies (USA).
Using green hydrogen as a fuel reduces carbon emissions from key industries such as transportation, and those that cannot easily be electrified, including steel and cement production and aerospace.

Example COPV for hydrogen (for illustrative purposes only)
Capabilities
CST Optimum is unique in that its in-house capabilities include the following.











Our Pressure Vessels
To meet growing demand from energy, transport, aerospace, and defence sectors, we produce lightweight and robust COPVs for safe, cost-effective storage and transport of green hydrogen and other gases.
CST Optimum supplies various sizes of Type III and Type IV COPVs, with end-to end design, manufacture and certification undertaken in-house.
CST Optimum also develop certified, custom designed and manufactured COPVs to meet our customers’ desired specifications and application. Uses include medical, firefighting, SCBA and life support, and the storage of alternative fuels, hydrogen, compressed natural gas, and other gases.
Latest news
- 18 April 2023
- Tooling has started here in Australia for the manufacturing of our ~1000L Type IV H2 pressure vessels. They will hold ~24 kg of compressed...
- 19 December 2022
- It’s amazing what you can achieve in a couple of weeks! Our Australian and US teams have been working together to produce these liners...
- 22 September 2022
- This is the successful burst testing of our Type IV COPV. Burst at 26500 PSI (1800 bar)....