Businesses should be aware of the hazards of working with acetylene and the importance of risk management when using such a flammable gas, says Norwich Union.
The call comes as the London Fire Brigade is campaigning for new government controls over businesses using acetylene cylinders.
Acetylene is commonly used in the motor, engineering and maintenance sectors as the fuel gas in oxy-fuel sets for cutting, burning and welding.
Phil Grace, casualty risk manager at Norwich Union, said: "Acetylene is inherently dangerous, and can cause asphyxiation, but the greatest risks are those of fire and explosion.
"With such potential hazards, businesses must undertake risk management and implement a number of key actions to reduce the risks of fire or explosions associated with acetylene cylinders.
Grace added: "All employees who use acetylene should be fully trained and understand the necessary emergency procedures.
