unvulcanized vs unvulcanised

unvulcanized and unvulcanised both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unvulcanized	No	Yes	No	No
unvulcanised	No	Yes	No	No

As adjectives, unvulcanized and unvulcanised are synonyms defined as:

unvulcanized and unvulcanised: (used of rubber) not subjected to the process of vulcanization

unvulcanized (adjective)	unvulcanised (adjective)
(used of rubber) not subjected to the process of vulcanization	(used of rubber) not subjected to the process of vulcanization