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SunSirs: Rising Costs Led to a Fluctuating Increase in DOP Prices Last Week
November 27 2025 15:11:11SunSirs(John)

The price of plasticizer DOP fluctuated and rose

According to the SunSirs commodity market analysis system, as of November 24th, the price of DOP was 6,967.50 RMB/ton, rebounding from 6,883.34 RMB/ton on November 14th, an increase of 1.22%. The rebound in isooctanol prices led to increased DOP costs and consequently, higher DOP prices. Last week, the operating rate of DOP plasticizer manufacturers slightly increased to 65%, resulting in increased DOP production. With rising DOP costs and increased supply, plasticizer prices fluctuated upwards last week.

The price of raw material isooctanol fluctuated and rose

According to the SunSirs commodity market analysis system, as of November 24th, the price of isooctanol was 6,250 RMB/ton, a slight decrease of 4.17% compared to 6,000 RMB/ton on November 14th. Some companies resumed operation of their isooctanol equipment, leading to a slight increase in the operating rate of isooctanol plants. The operating rate of isooctanol was at 80%, ensuring ample supply. Meanwhile, propylene prices had fluctuated upwards, increasing cost support for isooctanol. Last week, ample supply of isooctanol, coupled with cost support, had led to a price increase. Rising plasticizer costs and continued downward pressure on DOP (dimethyl propylene oxide) had increased upward support.

The price of raw material phthalic anhydride fluctuated and declined

According to the SunSirs commodity market analysis system, as of November 24th, the price of OX method phthalic anhydride was 5,800 RMB/ton, a decrease of 1.58% compared to the price of 5,893.33 RMB/ton on November 14th. Phthalic anhydride continued its downward trend, with prices fluctuating and declining. OX prices remained stable, costs stabilized, and phthalic anhydride plant operating rates stabilized, resulting in ample supply. Downstream enterprises increased their equipment operating rates, supporting phthalic anhydride demand. With stable costs and supported by demand, phthalic anhydride prices fluctuated and declined last week, while plasticizer costs decreased. Last week, downward pressure on DOP (dimethyl phthalate) plasticizer prices remained.

Market outlook

According to data analysts at SunSirs, regarding costs, isooctanol prices rose while phthalic anhydride prices had fluctuated and fallen, putting downward pressure on DOP (dimethyl phthalate) costs while increasing upward pressure. On the supply side, plasticizer manufacturers had slightly increased their operating rates, leading to increased production and ample supply. Looking ahead, with ample supply and rising costs, DOP prices are expected to fluctuate upwards in the near future.

If you have any inquiries or purchasing needs, please feel free to contact SunSirs with support@sunsirs.com.

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