... free. 2) standard specification: 1220x2440mm, 1200x2400mm Cement board for drywall steel partition system:Cement board is totally asbestos free.Standard Specification1. 1220*2440 ... of construction: structure frame, stud and track, furring channel, T grid, ceiling grid, metal ceiling, magnesium oxide board, gypsum board, fiber cement board, steel ...