Tags Thailand’s Siam Cement Group Thai conglomerate SCG now dominates Viet Nam's plastic production industry Monday, Mar 01, 2021 SCG, Thailand’s largest cement producer, will buy the stakes over three years, starting from 2021. Thai SCG eyes more investments in Viet Nam Monday, Jan 25, 2016 Thailand''s Siam Cement Group, which has invested US$700 million in Viet Nam since 1992, plans to expand its operations in the country, especially in the cement and upstream petrochemical sectors.