Greetings,
Guess the problem is that there is no legal definition or specification, it is simply a description.
You can only check the individual manufacturer's specification and compare, if it fits the dimensions etc then that is the end of the line and you write it off to experience. Maybe the seller would swop the tube for one from a different manufacturer, adjusting the cost accordingly.
Personally I currently use Michelin Reinforced 2.6 tubes, I know exactly what I am buying. I have used Continental too which gave good service too. Michelin do make a HD 4mm version which have given me excellent service in the past but they are very heavy. I always generously dust the inside of the tyre with talcum powder as it helps to lube and cool the surfaces, you smell nice too according to Joel
I attach a photo of an offending article which is as it was removed from my rear tyre whilst out on a ride. The tube was so wrapped around the nail that we had to cut it off before we could remove the nail
No tube would resist that attack
Attachment:
OOps puncture.jpg [ 434.42 KiB | Viewed 8137 times ]
Other riders choose other marques, but I think that I will stick with Michelin even though they generally tend to cost a little bit more upfront.
You could always sell it to make tank straps, (see other Post)
TTFN
Hugh.