Yes, VULCANIZED is a Scrabble word!

Letter values in Scrabble US: V 4, U 1, L 1, C 3, A 1, N 1, I 1, Z 10, E 1, D 2.

Is it a valid word?

VULCANIZED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

(used of rubber) treated by a chemical or physical process to improve its properties (hardness and strength and odor and elasticity)