Forty-six contract workers for KBR in northeast Missouri are set to go on a work strike starting at 12:01 a.m. Saturday morning.
Ross Miller, a business representative for the International Association of Machinists and Aerospace Workers, says the union rejected a contract proposal.
The union ratified a plan to go into strike mode when the existing contract expires Saturday morning.
The workers are employed by KBR, which is a contractor for BASF.
Miller did not comment on the reason why workers rejected the contract.
A KBR spokesperson could not be reached for comment.