Recently, the supply of phthalic anhydride in China has tightened significantly. Manufacturers such as Changzhou Xinyang have shut down their facilities for maintenance, while producers like Tongling Chemical are experiencing tight supply and limited sales. The quotations for phthalic anhydride have been increasing consecutively. This analysis uses the average difference method to objectively assess the short-term price trend of phthalic anhydride for the industry's reference.
Data Description
The latest available data is up to October 18, 2026. It is recommended to refer to real-time data.
I. Table of Finite Differences
| Difference Type | Today’s Value (2026.10.18) | Yesterday’s Value (2026.10.17) | Direction of Change |
|---|---|---|---|
| 5-Day Difference (D5) | 40 | 126.67 | - |
| 10-Day Difference (D10) | 216.66 | 201.66 | + |
| 20-Day Difference (D20) | 234.17 | 202.5 | + |
II. Signal State Determination
The current combination of changes in the three differences compared to the previous day is (－, ＋, ＋), which aligns with the characteristics of a strong consolidation (bullish) signal in China.
III. Conclusions on Trend Directions
Phthalic anhydride prices in China are expected to trend with volatility, but with a slightly bullish bias.
Reason: The changes in the three differences from the previous day are not entirely consistent, failing to meet the clear criteria for a rising or falling trend. Therefore, the overall judgment is that it is in a fluctuating trend. Combined with the signal combination, it falls within the scope of a strong consolidation, and the short-term trend is biased towards an upward direction.
IV. Positional Space Reference
Phthalic anhydride prices are in the 5th tier (high price range, corresponding to the top 20% of the price range within the respective periods) for 60-day, 3-month, and 1-year cycles, with limited room for further increases.
V. 1-Year Price Trend Chart
6. Risk Warning
The above analysis is for reference only and does not constitute trading advice.
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