What's the adjective for rustproof? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs rust and rustproof which may be used as adjectives within certain contexts.
“Among these were the plastic brick tie, replacing the rustable metal figure of eight ties which litter building sites across the land.”
“In packaging it has potential for protecting medical devices, pharmaceutical products, easily oxidisable and rustable materials and vacuum heat insulating building materials.”