Workplace Health and Safety Queensland recently issued a safety alert about imported acetylene cylinders that have been found to contain asbestos.
The asbestos identified through tests relates to the internal insulation (porous mass) in the acetylene cylinders.
The cylinders were manufactured and supplied by companies based in China.
The Australian importer was advised by the China-based supplier that the cylinders were asbestos-free.
A batch was tested in China in 2018 and the laboratory certificate stated the insulation did not contain asbestos.
Another batch was tested in 2020 by a National Association of Testing Authorities (NATA) laboratory in Australia and was found to contain chrysotile asbestos.
Acetylene is a colourless gas which is widely used as a fuel and a chemical building block. It is the hottest of all fuel gases and is used for a number of applications including welding, plastics and acrylic acid derivatives and portable lighting.
An acetylene cylinder has a different design from most other gas cylinders. It consists of a steel shell containing a porous mass.
Asbestos might be located in the porous mass, the neck and base of the cylinder, depending on where it is manufactured.
The acetylene gas in the cylinder is dissolved in acetone which is absorbed by the porous mass.
Like other compressed industrial gases, acetylene can be hazardous to the user and for those nearby if not handled and used correctly.
While asbestos has been prohibited in Australia since December 2003, in some countries it is still used in manufactured products. Certification of asbestos-free goods from some overseas manufacturers have been found not to meet Australian requirements.
The importation, manufacture, supply, sale and use or reuse of asbestos and asbestos-containing products is not permitted, except under very limited circumstances. Some supplier countries may classify goods with low levels of asbestos as ‘asbestos-free’. In Australia, any level of asbestos is prohibited for import or use.
The alert subsequently recommended a number of risk controls, and said available information indicates that these cylinders do not pose a measurable health risk through normal consumptive use, providing the cylinders are not refilled.
Consumers should not perform any maintenance, repairs or modifications on these cylinders, and the alert said: