DALLAS (AP) - Chemicals maker Celanese Corp. on Monday said it has temporarily halted production of acetic acid at its Clear Lake, Texas, plant due to an unexpected outage.

The shutdown ''may have a modest impact on second-quarter results,'' the company said.

The facility has an annual production capacity of about 1.2 million tons of acetic acid, a chemical used in making plastics and wood glue.

The acetic acid unit should resume operations by the end of May.

Celanese said it has informed customers of the outage and declared “force majeure,” a contract clause that exempts the company from liability for an unexpected event.