PU or PVC - or what did Tornado use when?
I know there are various threads on here re Tornado using PU for their tubes, but there are also comments along the lines of "it'll be PU if it's newer than XXXX". Anyone know please what a mid-90's Tornado would have been? Or alternatively, how to distinguish between PU and PVC (and other comments suggest Tornado did use the latter)? I've seen the ribstore guide which discusses how to distinguish Hypalon and PVC but although it mentions PU at the end it doesn't say how to positively ID the stuff...)
I suspect it's PU but would like to be sure... also strongly suspect it's a previously asked question but repeated searches haven't found an answer....
So many thanks for any help!