On Tue, 19 Nov 2019 17:57:47 +0000, Andy Burns wrote:

Calor say 95 kg full for their 47 kg cylinders. Mind you they have
quite a spread for tare weight 29.5 to 57.7 kg.

Yes, just noticed that, have they switched from steel to aluminium?
I wouldn't have thought so ...

Niether would I ali isn't that strong. Look at how much ali there is
in an alloy wheel compared to a steel one. Ali might have a lower
density but you need more of it to get the strength of steel, so the
weight ends up about the same.

Perhaps older cylinders were over engineered?

--
Cheers
Dave.