The vast majority of tubs are made from polypropylene as THIS MANUFACTURER shows us.
Only the Electrolux group use ‘carboran’ which is a mixture of carbon and synthetic polymers generally not re-cycleable though the compound can be melted down and reformed, or so I’m told. 😕
I suspect the later production machines from Lux factories are using polyprop tubs these days. I can’t see any carboran logo markings on them anywhere?