Nearly 50 jobs hang in the balance at window firm Spectus. The Snape Road PVC company has begun full consultation with its 136 staff.
A spokesman from parent company the Epwin Group, said: "This announcement could potentially affect 49 members of the manufacturing team. Under the proposals, which see some production moved to manufacturing sites in Telford, the Spectus manufacturing plant will remain open but with a reduced level of output.
"We understand that this will be a difficult time for staff and we will ensure that they are informed about all developments as and when they happen."