This short-term trend analysis of phthalic anhydride spot prices based on the average difference method shows that the 5-day, 10-day, and 20-day average differences are all negative compared to the previous day, with prices in the high range over the past year. A clear downward trend is evident in the short term, compounded by successive price reductions from major Chinese manufacturers. The pressure for a pullback from the high levels is significant, and attention should be paid to subsequent plant operations and changes in downstream demand.
Data Explanation
The latest available phthalic anhydride spot data in China is up to September 23, 2026. It is recommended to refer to real-time data.
1. Mean Deviation Change Table
| Average Difference Type | Value as of 2026.09.23 | Value as of 2026.09.22 | Direction of Change |
|---|---|---|---|
| 5-Day Average Difference (D5) | -150 | -100 | - |
| 10-Day Average Difference (D10) | -36.67 | 3.33 | - |
| 20-Day Average Difference (D20) | 220.84 | 255.84 | - |
2. Signal Status Determination
Currently, the three differences are all negative and moving in the same direction, which is a clear signal of a decline in China.
3. Trend Direction Conclusion
The short-term price trend is clearly downward, for the following reasons:
According to the rules of average difference, the 5-day, 10-day, and 20-day average differences have all changed in a negative direction compared to the previous day, meeting the criteria for a clear downward trend.
Fundamental support: From September 21 to 23, 2026, the quotes from major phthalic anhydride manufacturers in China were cumulatively reduced by 100-250 CNY/ton. The actual transaction prices of spot goods continued to decline, with some manufacturers limiting orders. Market transactions were relatively weak.
4. Position Space Reference
Phthalic anhydride 60-day, 3-month, and 1-year cycle prices are all in the 5th tier (high range), with limited room for increase and significant pressure for a high-level correction.
5. Trend Chart Display
6. Fundamental Reference
Upstream: Fluctuations in the prices of refined naphthalene and OX directly affect phthalic anhydride production costs.
Supply side: Zhenjiang Liancheng’s 120,000‑ton phthalic anhydride plant is shut down for maintenance, while Changzhou Xinyang’s 100,000‑ton facility is operating at around 60% capacity. Overall supply remains tight, with inventories at low levels.
Downstream: The changes in demand for unsaturated resins and plasticizers (DBP, DOP, etc.) have a significant impact on the price transmission of phthalic anhydride in China.
7. Risk Warning
The above analysis is for reference only and does not constitute trading advice.
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