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SunSirs: Costs Decreased, Phthalic Anhydride Prices Fluctuated and Fell Last Week

November 17 2025 14:06:14     SunSirs (John)

Phthalic anhydride prices fluctuated and fell last week

According to the commodity market analysis system of SunSirs, as of November 14th, the price of OX based phthalic anhydride was 5,893.33 RMB/ton, a decrease of 0.56% compared to the price of 5,926.67 RMB/ton on November 7th. Phthalic anhydride continued its downward trend, with prices fluctuating and falling. The price of OX also fluctuated and fell, leading to lower costs. Phthalic anhydride plant operating rates increased slightly, resulting in ample supply. Downstream DOP plant operating rates also increased slightly, maintaining demand support for phthalic anhydride. Lower costs and supported demand led to a fluctuating decline in phthalic anhydride prices last week.

Phthalic anhydride costs decreased

On November 14th, Sinopec's OX price was 5,800 RMB/ton, a decrease of 300 RMB/ton (4.92%) from the November 1st price of 6,100 RMB/ton, and a decrease of 100 RMB/ton (1.69%) from the November 7th price of 5,900 RMB/ton. The decline in OX prices had lowered phthalic anhydride costs. Phthalic anhydride plant operating rates increased slightly, resulting in ample phthalic anhydride supply. Lower costs increased downward pressure on phthalic anhydride prices.

On the demand side: DOP prices fluctuated and declined

According to the commodity market analysis system of SunSirs, as of November 14, the price of DOP was 6,883.34 RMB/ton, a decrease of 2.03% compared to the price of 7,025.83 RMB/ton on November 7. Last week, the operating rate of plasticizer DOP enterprises increased slightly, resulting in increased DOP production. The demand for phthalic anhydride remained supported, and the downward pressure on phthalic anhydride prices weakened.

Market outlook

According to analysts at SunSirs, regarding phthalic anhydride product data, on the demand side, plasticizer manufacturers slightly increased the load on their DOP (dimethyl phthalate) equipment, leading to increased plasticizer production and continued support for phthalic anhydride demand. On the cost side, the price of o-xylene and raw materials had fallen, reducing the cost of phthalic anhydride. Looking ahead, with declining costs and continued demand support, phthalic anhydride prices are expected to fluctuate downwards.

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