Recently, the spot price of DOP in China has been continuously declining, with mainstream production enterprises lowering their quotations for several consecutive days. Quantitative analysis using the average difference method shows that DOP has entered a clear downward trend, and the long-term price is in a high range, with limited room for increase. It is recommended that market participants pay close attention to the cost fluctuations of upstream 2-ethylhexanol and phthalic anhydride, as well as the changes in procurement demand from the downstream PVC plasticizer industry.
The most recent available data is up to September 21, 2026. It is recommended to refer to real-time data.
I. Table of Finite Differences
| Mean Difference Indicator | Value as of September 21, 2026 | Value as of September 20, 2026 | Direction of Change |
|---|---|---|---|
| 5-Day Mean Difference (D5) | -65 | -3.34 | - |
| 10-Day Mean Difference (D10) | 74.17 | 97.5 | - |
| 20-Day Mean Difference (D20) | 275.42 | 302.09 | - |
II. Signal State Determination
The current signal is a clear bearish signal.
III. Conclusion on Trend Directions
The current DOP price trend is clearly downward. Reasons: The changes in the 5-day, 10-day, and 20-day moving average differences compared to the previous day are all consistent and downward, meeting the criteria for a clear downward trend according to the moving average difference method. Additionally, since September 17, the quotations from major DOP producers in China have generally been reduced by 50-200 CNY per ton, and the actual market transaction prices have continued to decline, further confirming the downward trend.
4. Spatial Reference
Prices for the 60-day, 3-month, and 1-year cycles are all in the fifth tier (high range), with limited upside potential and significant downward pressure at higher levels.
V. Chart Display
VI. Risk Warning
The above analysis is for reference only and does not constitute trading advice.
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