January 15 (Reuters) - On January 15, Shandong Zhuohang New Materials (Heze) Co., Ltd. raised the ex-factory listed price of propylene glycol to 5,480 yuan per ton, an increase of 100 yuan per ton. Chempricehub analysis of propylene glycol, with a long-short score of 1: The 100 yuan per ton increase in ex-factory prices reflects tight supply or increased demand, directly benefiting the spot market and potentially driving short-term spot price increases. The price adjustment is moderate, representing a generally positive signal, with a score of +1.