September 28th, according to reports,
1. Mean Difference Change Table
| Mean Difference Indicator | Today’s Value (2026.09.27) | Yesterday’s Value (2026.09.26) | Direction of Change |
|---|---|---|---|
| 5-Day Mean Difference (D5) | 3.33 | -3.33 | + |
| 10-Day Mean Difference (D10) | -79.99 | -110.00 | + |
| 20-Day Mean Difference (D20) | 62.50 | -15.83 | - |
2. Signal Status Judgment
The current signal is strong rebound (bullish, rebound in nature).
3. Trend Direction Conclusion
The current PC price trend is volatile. Reason: The combination of the three successive differences in direction compared to the previous day is (+, +, -), indicating that the directions of change are not fully aligned, thus meeting the criteria for identifying a ranging (sideways) trend.
4. Positional Spatial Reference
On the 60-day cycle, prices are in the fourth tier (mid-to-high range); on the three-month cycle, they are in the fifth tier (high range); and on the one-year cycle, they are in the third tier (mid-range). Upside potential is limited on the three-month cycle, while there is relatively ample room for price fluctuations on the one-year cycle. Additional fundamental reference: Upstream prices for bisphenol A and dimethyl carbonate remain at elevated levels, providing strong cost-side support; on the supply side, Chimei’s 180,000‑ton‑per‑year PC plant in Zhangzhou is currently operating at a single‑line capacity, ensuring stable availability of product, while the overall supply‑demand balance remains relatively tight.
5. Trend Chart Display
Risk Warning
The above analysis is for reference only and does not constitute trading advice.
2. Signal Status Judgment
The current situation is a clear signal of decline.
3. Trend Direction Conclusion
The current price trend for PCs is clearly downward. Reason: The three moving averages—D5, D10, and D20—have all changed in the same direction as the previous day, all registering negative values, thereby satisfying the criterion of the moving-average method for identifying a clear downtrend. Fundamental update: Currently, a single line of the Chi Mei PC facility in Zhangzhou and the Sichuan Tianhua PC facility are operating at reduced capacity, with overall supply remaining stable; upstream bisphenol A and dimethyl carbonate are both at high price levels, providing some support to PC costs, which may limit the extent of any potential price decrease.
4. Positional Spatial Reference
60-day cycle: It is in the 4th tier (moderately high), with limited short-term upside potential and significant pressure for a pullback. * 3-month cycle: Currently at the 5th level (high range), with insufficient mid-term upward momentum. * 1 year cycle: In the 3rd tier (median), there is still some room for price fluctuation in the long term.
