Inventories held by key state-controlled producers Sinopec and PetroChina were at 890,000t today, down by 100,000t from a week earlier, marking a fourth consecutive week of decline.
But stocks remain high compared with typical levels of around 700,000t.
Linear low-density polyethylene film prices in China rose by $25/t from last week to $720/t today, while high-density polyethylene film prices increased by $45/t to $755/t over the same period, according to Argus data.
By Muhamad Fadhil and China staff