C5 Industrial Chain Market Morning Briefing (20260908)

I. Key Focus Points

1. The US–Iran conflict remains unresolved, and the latest attacks on Saudi oil facilities have extended supply risks, pushing international crude prices higher. NYMEX crude futures were closed for the US Labor Day holiday with no settlement price. ICE Brent futures for November delivery settled at $97.00/bbl, up $0.72/bbl, or +0.75% from the previous settlement. China's INE crude futures for the 2610 contract rose 5.4 yuan/bbl to 688.5 yuan/bbl, and added a further 11.9 yuan/bbl to 700.4 yuan/bbl in the night session.

2. As of September 7, Japanese naphtha settled at $869.50/mt, up $6.50/mt from the previous trading day. Singapore naphtha settled at $92.60/bbl, down $0.15/bbl.

3. Major domestic cracked C5 producers raised prices yesterday, by 150 yuan/ton in East and South China and by 200 yuan/ton in North China. Shandong mixed C5 prices remained firm, and light fractions stayed in tight supply. Auction prices for cracked C5 from private enterprises were firm, lending support to major producers' cracked C5 price levels. On the downstream processing side, pentadiene monomer inventories remained low and prices stayed firm. Downstream resin demand was only moderate, and industry sentiment was not particularly optimistic.

4. The cracked C5 residue market remained broadly stable yesterday, with trading focused on contract execution. Escalating US–Iran tensions kept crude prices elevated. The gasoline market slipped slightly, while shipment activity picked up. Supply–demand support for the similar product mixed C5 has weakened. Cracked C5 residue prices were largely held steady, with contract execution as the main focus.

5. The domestic piperylene market moved higher yesterday on the whole. Tight market supply and rising feedstock prices provided support, with sellers mainly holding prices firm. Downstream players came under margin pressure, leading to some plant shutdowns and passively higher prices. Mainstream ex-works prices stood at 8,300–9,300 yuan/ton.

6. Domestic isoprene prices rose in some areas yesterday. With cracked C5 feedstock and downstream SIS prices moving higher, and isoprene supply remaining tight, sellers continued to hold prices firm today. Mainstream offers/bids in the East China market ranged from 13,000 to 13,600 yuan/ton.

7. Dicyclopentadiene (DCPD) prices on a self-pickup basis continued to move higher yesterday, trading at 8,100–8,600 yuan/ton. The low end of the range applied to steady customers, while spot deals drifted toward the high end. Spot supply remained tight, and further feedstock price gains reinforced cost support. High prices and difficulty sourcing material persist; demand has softened somewhat, and few deals have been heard.

8. Mainstream road-marking C5 petroleum resin prices stood at 9,300–10,300 yuan/ton yesterday. Rising essential downstream demand, together with routine autumn maintenance at some units, has aggravated supply tightness in northern China. In addition, feedstock C5 prices kept climbing, making it difficult for producers to cover costs. Negotiated prices continued to rise within the range by 200–500 yuan/ton.

9. Mainstream piperylene-based adhesive C5 petroleum resin prices stood at 10,500–12,500 yuan/ton yesterday, while CPD-stripped adhesive C5 petroleum resin prices were at 10,000–10,800 yuan/ton. Spot resin supply remains tight and costs are rising. In the near term, downstream essential demand leaves limited room for bargaining, and negotiated prices continued a steady upward push.

Core logic: Cracked C5, isoprene, piperylene and DCPD prices are rising; C5 petroleum resin prices are being pushed up modestly on a stable basis.

II. Price Tables

Table 1 Domestic cracked C5 industry chain summary (Unit: yuan/ton)

III. Market Outlook

Domestic cracked C5 prices are expected to remain firm. Shandong mixed C5 prices may ease slightly but should retain a spread relative to cracked C5. Fuel-component values are currently at high levels and carry higher risk; industry players are generally cautious and adopting a wait-and-see stance. Cracked C5 prices from private enterprises are expected to remain somewhat firm. As for pentadiene monomers, low inventories are underpinning prices; however, resin offtake has been only moderate. Road-marking resin demand in particular is weak due to limited construction volumes.

Cracked C5 residue prices are expected to consolidate at high levels. Refineries hold low gasoline inventories, giving them ample ability to support prices. Existing orders at ports also provide underlying support for mixed C5 prices. Taking these factors together, Chempricehub expects cracked C5 residue producers to hold prices stable with a consolidative tone today.

Crude oil opened lower, but the size of the decline gives limited direction to the market. Buying and selling sentiment in the gasoline market has improved. With mixed C5 supply expected to recover, Chempricehub forecasts a weak, fluctuating session for the mixed C5 market today.

Isoprene is expected to hold steady and consolidate. The tight-supply pattern persists, and tradable volumes in the market remain limited. Given that prices are already at relatively high levels and output from some restarted plants is gradually recovering, prices are expected to stabilize and consolidate amid a wait-and-see attitude.

Piperylene is expected to hold steady in consolidation. Plant output has declined and some material is retained for captive use, leaving limited tradable volumes in the market. Downstream margins, however, are under pressure, and some resin plants have suspended operations, heightening market caution. Piperylene prices are therefore expected to consolidate.

DCPD prices are expected to remain on a firm footing. Tight spot supply will be difficult to ease in the near term, while feedstock prices provide notable cost-side support. Although demand is expected to soften due to tight supply and high prices, the market should maintain an upward trajectory from the low end of the range in the short term.

For road-marking C5 petroleum resin, downstream construction activity is rising steadily, and an increase in plant turnarounds in northern China—combined with higher feedstock C5 prices—is driving negotiated prices further up. For adhesive-grade C5 petroleum resin, producers face rising cost pressure while downstream essential demand grows steadily. With supply falling short of demand in the short term, overall negotiated prices will continue to edge up, although downstream acceptance of excessively high local prices has weakened.

IV. Data Calendar

Table 2 Domestic cracked C5 industry chain data overview (Unit: 10,000 tons)

Notes: 1. ↓↑ denotes a significant fluctuation, highlighting data metrics with a change exceeding 3%. 2. ↗↘ denotes a narrow fluctuation, highlighting data metrics with a change within 0–3%.