合成橡胶：震荡承压，但下方空间收窄

Report Industry Investment Rating - The trend strength of synthetic rubber is -1, indicating a weak bearish outlook [3] Core Viewpoints - Synthetic rubber is under short - term shock pressure with a neutral - downward driver, but the downside space is narrowing from a valuation perspective. The fundamentals of butadiene and cis - butadiene rubber face increased pressure mainly due to high supply. The supply growth rate is higher than the demand growth rate in a situation of both supply and demand increasing. The inventory pressure of cis - butadiene rubber is rising, and the high processing profit on the cis - butadiene rubber futures is unsustainable. Butadiene is also expected to face high - supply pressure, which will put pressure on the cost side of cis - butadiene rubber. Macroscopically, the Fed's interest - rate cut signal is neutral, and the macro - end has limited impact on the commodity market before the next Fed meeting and the Fourth Plenary Session. The downside space of the futures price is narrowing as the fundamentals are partially reflected in the valuation, the futures price is at a discount to the spot price, and the price is approaching the static cost line [3] Summary by Relevant Catalogs Fundamental Tracking - In the futures market, the closing price of the cis - butadiene rubber 10 - contract increased by 30 yuan/ton to 11,445 yuan/ton, the trading volume decreased by 21,553 lots to 94,561 lots, the open interest increased by 756 lots to 75,259 lots, and the trading volume decreased by 122,814 ten - thousand yuan to 542,409 ten - thousand yuan. The basis of Shandong cis - butadiene rubber to the futures main contract decreased by 30 to 205, and the monthly spread (BR10 - BR11) increased by 15 to 70 [1] - In the spot market, the prices of cis - butadiene rubber in North China, East China, South China, and Shandong remained unchanged. The prices of Qilu styrene - butadiene rubber of models 1502 and 1712 also remained unchanged. The mainstream prices of butadiene in Jiangsu and Shandong increased by 50 yuan/ton and 75 yuan/ton respectively [1] - In terms of fundamentals, the cis - butadiene rubber operating rate, theoretical full cost, and profit remained unchanged [1] Industry News - As of September 17, 2025, the inventory of domestic cis - butadiene rubber sample enterprises was 33,700 tons, a decrease of 800 tons from the previous period, a month - on - month decrease of 2.29%. The downstream continued to purchase at low prices, and the spot negotiation center was under pressure. The inventories of sample production enterprises and sample trading enterprises both decreased slightly [2] - As of September 17, the latest inventory of butadiene in East China ports was about 22,100 tons, a decrease of 2,500 tons from the previous period. Some imported cargoes have not been put into storage, and the short - term inventory continues to decline with limited tradable volume. However, there are still expectations of cargo arrivals, and the import volume in September is expected to be sufficient [2][3]