dauerhaft in English:

These trousers are made of durable cloth.

The material is really durable.

The boots are expensive but pretty durable.

a durable solution

Nokia produces the most durable phones.

durable, waterproof bandages

How do we know that something is durable?

The bronze is nice hard, durable material that could roll on the ground.

the rubber used is durable and strony so as it will not tear, expand or wrap out of shape