The company that makes steel tubing has been fined £25,000 for using it in a fireproof project in north-west England.
The company said the tubing was made from the same material as fire-resistant steel and that it did not use chemicals that could potentially be used to damage the environment.
A fire inspection found the company had not taken steps to minimise the risk of fire from the tubing, which was used in the building of a house and a road bridge.
It also said the company did not comply with fire safety standards when building a wall in north Wales and a wall to prevent road damage in the village of Woodbridge, near Bournemouth.
The company was fined £23,500 and ordered to pay £50,000 in costs.
It has now withdrawn the project and is considering legal action.