Translation of "modstandsdygtig" into English

Hvad værre var, man fandt flere anvendelsesmuligheder for disse modstandsdygtige kemikalier, hvilket gjorde at produktionen fortsatte med at stige.

What was worse, more uses were found for the hardy chemicals, so their production continued to soar.

Kun stive plastruder med en beklædning, der er modstandsdygtig over for slid, underkastes denne prøvning.

Only rigid plastic glazing with an abrasion resistant coating shall be submitted to this test.

De er derfor modstandsdygtige over for krudt og kugler.

That's why solid matter, bullets and missiles, won't harm them.