March 3 (Reuters) - On March 3, Shandong Lihuayi Weiyuan Chemical raised the ex-factory listed price of propylene glycol by 100 yuan/ton to 5,600 yuan/ton. Chempricehub's analysis of propylene glycol shows a long-short score of +1. The price increase by Shandong Lihuayi Weiyuan Chemical indicates tightening spot market supply or rising demand, which is favorable for spot prices. Although the adjustment is significant, it does not reach the level of a major event, scoring +1 (moderately positive). It is expected that spot prices may remain strong in the short term.