... ) standard specification: 1220x2440mm, 1200x2400mm Cement board for drywall steel partition system:Cement board is totally asbestos free.Standard Specification1. 1220*2440 ... Shenzhen Excel Building Products Co., Ltd.www.cnebp.comWe are solution of construction: structure frame, stud and track, furring channel, T ... structure, C channel, U channel. Cement board for drywall partition system