On 18/09/2019 09:52, nightjar wrote:
On 18/09/2019 07:29, harry wrote:
https://www.bbc.co.uk/news/science-environment-49567197
When I was involved, oil was mainly used.


SF6 was introduced as a safer alternative to PCBs.


And this was discussed 10 years ago. Not sure why the
BBC have suddenly 'discovered' a problem.