Cytec Industries is to invest £65m in a new manufacturing facility at its Wrexham site to supply materials to the aerospace industry.
The expansion is set to create 50 highly-skilled jobs at the site, which currently employs about 230 staff. Work is due to start in September 2015.
The 75,000 sq ft facility, to be built opposite Cytec's existing manufacturing plant on the Wrexham Industrial Estate, will primarily supply its EU and Asia-Pacific customers.
The Wrexham factory is the main location for Cytec Aerospace Materials European technical service and development team, including the customer service arm.
Following initial discussion at Farnborough Airshow, the Welsh Government has sold a four-acre site it owned on Abenbury Way for the expansion and assembled a team of architects, planners and property experts to carry out the preparatory work.
Economy minister Edwina Hart said: "It is a significant investment by Cytec and a major commitment to their operation in Wales.
"Cytec operates in one of our key economic sectors and is a global player and I am pleased the Welsh Government was able to provide the support needed to secure this very important expansion for Wales."