Saudi Arabia’s Sadara Basic Services, which is fully owned by Sadara Chemical Co, said it would start late December planned maintenance of a mixed-feed cracker at its parent company’s petrochemical complex in Jubail, Reuters reported.

The shutdown of the facility is expected to last six weeks, with the company’s three polyethylene trains also shut during the period as Sadara completes improvements to their reliability and scheduled maintenance, according to Gulf Business.

Sadara Chemical is a $20b petrochemical joint venture between national oil giant Saudi Aramco and Dow Chemical. Furthermore, it was the first company to launch a start-up Solution Polyethylene facility in the Middle East.

Early 2016, Sadara had announced that its chemical complex in Jubail Industrial City II was more than 97% complete, after launching its first product, the Linear Low Density Polyethylene (LLDPE). At the time Sadara was trying to attract investors to the adjacent PlasChem Park that would use products and raw materials in the Jubail area for downstream manufacturing and conversion industries.