The main form of rubber is harvested from latex from the para rubber tree or others. The leading producer of rubber in the world is Malaysia.
Rubber has a high resilience and a large stretch ratio. It is also extremely waterproof.
So can hamsters eat rubber at all?
No, hamsters cannot eat rubber at all.
They could gnaw on the rubber a bit but run the risk of choking on the rubber and they cannot easily digest it.
Therefore make sure your hamster avoids trying to eat rubber.