Japan Ethylene Consolidation: What It Means for Resin Buyers

Picture a film converter in Thailand (a fictional example) that has run the same Japanese LDPE grade for ten years. One morning, its trading-company contact forwards a notice from Japan: the grade will go out of production "around fiscal 2030." The plant manager immediately wants to know whether resin will run out, and how long it will take to qualify a replacement.

Notices like this may become more common as Japan shrinks its ethylene base. In western Japan, Asahi Kasei, Mitsui Chemicals, and Mitsubishi Chemical will shut the ethylene cracker at Mizushima and run a single cracker in Osaka instead. Other cracker consolidations in Japan are under way at the same time.

Japan's overall polyethylene capacity still exceeds demand, so a general shortage is unlikely. For buyers outside Japan, the harder work is replacing a specific grade, possibly with one from a different producer, and requalifying the parts made from it. This article explains what was decided, why, and what to check now.

Figure 1: Western Japan Goes from Two Ethylene Crackers to One

The Mizushima cracker will shut down, and the Osaka cracker will be run by a joint entity of the three companies.

Mizushima (Kurashiki, Okayama)AMEC Mizushima Plant: 496,000 t/yr
Asahi Kasei / Mitsubishi Chemical 50:50 JV

Osaka (Takaishi, Osaka)OPC Senboku Factory: 455,000 t/yr
Mitsui Chemicals subsidiary

Mizushima shuts down (target: fiscal 2030)

One cracker in Osaka (455,000 t/yr)Run by a joint operating entity of the three companies. Planned equity: Mitsui Chemicals 45%, Mitsubishi Chemical 45%, Asahi Kasei 10%

The Mizushima site

Cracker and related equipment to be dismantled promptly; the three companies will study carbon-neutral uses for the siteAsahi Kasei will install an initial Revolefin plant at its Mizushima Works to make basic chemicals from bioethanol

Capacities are for a year with a maintenance turnaround. Combined capacity before consolidation: 951,000 t/yr. Sources: the three companies' joint release; Japan Petrochemical Industry Association (JPCA) capacity by producer, end of 2024.

Contents

1. What Was Decided in Western Japan
2. Why Shutting One Cracker Affects So Many Products
3. Why Japan Is Consolidating Now
4. The Bigger Picture: Japan's Ethylene Cracker Consolidation
5. What Resin Buyers Outside Japan Will Face
6. Concentration Risk: One Cracker, Less Backup
7. Checklist: What to Verify Now
8. Questions for Your Japanese Supplier
9. Limits of This Article
10. FAQ
11. Sources

What Was Decided in Western Japan

On January 27, 2026, the three companies announced a basic agreement covering their two ethylene crackers in western Japan. They will set up a joint operating entity, shut down the Mizushima cracker in Kurashiki, Okayama Prefecture, and consolidate production at the cracker in Takaishi, Osaka, targeting fiscal 2030. For all three companies, fiscal 2030 runs from April 2030 to March 2031.

The cracker that will close belongs to Asahi Kasei Mitsubishi Chemical Ethylene Corp. (AMEC), a 50:50 joint venture of Asahi Kasei and Mitsubishi Chemical.

The one that stays belongs to Osaka Petrochemical Industries, Ltd. (OPC), a Mitsui Chemicals subsidiary, at its Senboku Factory.

Capacity Falls from 951,000 to 455,000 Tons a Year

According to the companies, western Japan's ethylene capacity drops from 951,000 metric tons a year to 455,000. That cuts the region's capacity roughly in half.

JPCA data put Japan's total ethylene capacity at 6,162,000 tons a year at the end of 2024. The 496,000-ton Mizushima cracker accounts for about 8% of that total.

The Joint Operating Entity and Its Equity Split

On May 12, 2026, the companies said they would continue talks on the premise of a 45% / 45% / 10% split among Mitsui Chemicals, Mitsubishi Chemical, and Asahi Kasei. The split reflects how much olefin output (ethylene and other basic chemicals) each company plans to take.

Sharing costs and benefits according to offtake gives all three companies a stake in running one cracker at a high operating rate. Final details, including the equity split, will be set in a joint venture agreement. The date for establishing the entity has not been decided.

Government Support and a ¥21.2 Billion Investment

The project was selected for a Ministry of Economy, Trade and Industry (METI) program that supports process change in hard-to-abate industries (the "HtA Support Program"). Total investment is ¥21.2 billion, including a maximum subsidy application of ¥10.4 billion, with completion scheduled by the end of fiscal 2029.

The money goes to the receiving, shipping, and utility systems (power, steam, and so on) needed to consolidate the crackers, and to the initial Revolefin plant. The companies expect consolidation to cut CO2 emissions from their own fuel use and purchased electricity (Scopes 1 and 2) by 506,000 tons a year.

According to Asahi Kasei, Revolefin replaces only the cracking furnaces with dedicated equipment, so existing plants can be reused. The company is also studying commercialization at the consolidated Osaka cracker. Non-fossil feedstocks like this, along with chemical recycling of waste plastics, are becoming a main route to decarbonizing petrochemicals.

The timeline below shows how the plan has developed and what comes next.

Figure 2: Western Japan Consolidation Timeline

About six years from the start of talks to shutdown, and about ten years to commercial production of decarbonized chemicals.

So far

May 2024Talks beginThe three companies start studying consolidation and decarbonization (reported)

Sep 2025Setouchi Ethylene LLP formedA vehicle for integration talks (reported)

Jan 27, 2026Basic agreement signedMizushima to close, production to move to Osaka; selected for the HtA program

May 12, 2026Planned equity split announced45% / 45% / 10%. Asahi Kasei also announces the Mizushima derivatives restructuring

Next

By end of FY2029Equipment work completeReceiving, shipping, and utilities, plus the initial Revolefin plant

FY2030 (target)Mizushima cracker shuts downProduction consolidated in Osaka. Asahi Kasei's PE and SM production to end

FY2034Commercial production of decarbonized chemicalsJoint commercial production targeted by the three companies

May 2024 and September 2025 events are from Nikkan Kogyo Shimbun (Newswitch) reports; all others are from company announcements. FY = Japanese fiscal year, April to March.

Why Shutting One Cracker Affects So Many Products

An ethylene cracker heats naphtha (a light fraction from crude oil refining) to very high temperatures and breaks it down into basic chemicals. Ethylene is the raw material for polyethylene, PVC, and styrene. Through them, it ends up in packaging film, auto parts, appliances, and building materials.

The key point for buyers: a cracker does not make only ethylene. Cracking naphtha also produces propylene, a C4 stream (including butadiene), and pyrolysis gasoline, the feedstock for benzene and other aromatics. When one cracker closes, the supply of all these co-products has to be rearranged too.

The figure below shows how a single cracker feeds the plants downstream.

Figure 3: From Cracker to Finished Product

When an upstream cracker shuts down, every derivative plant that depends on it must reassess its feedstock supply.

NaphthaMade by refining crude oil. Japan imports much of it

Cracking (ethylene cracker)

Basic chemicalsEthylene, propylene, C4 stream, and pyrolysis gasoline (aromatics feedstock), all produced together

By pipeline or ship to each plant

PolyethyleneLDPE, HDPE, and others. Film, containers

Styrene monomerFeedstock for polystyrene, ABS, and synthetic rubber

Other derivativesPVC, vinyl acetate, EVA, and more

Processing

Molded parts and end productsPackaging, auto parts, appliances, building materials, consumer goods

In a Japanese petrochemical complex (konbinato), the cracker and the derivative plants are often linked by pipeline.

In a Japanese petrochemical complex, or konbinato (コンビナート), the cracker and its neighbors trade feedstock directly by pipeline. When the upstream cracker stops, each downstream plant must either bring in feedstock from somewhere else or stop production. When a resin plant chooses to stop, its customers abroad feel it directly.

Why Japan Is Consolidating Now

Two forces are behind the move: shrinking demand at home and tougher competition abroad. In its May 2026 materials, Asahi Kasei pointed to a long-term decline in domestic demand as Japan's population falls. It also cited weaker competitiveness in East Asia, once a major export market, which has kept plants running at low rates for years.

Idemitsu Kosan and Mitsui Chemicals, which are consolidating crackers in Chiba, gave similar reasons: large new petrochemical complexes, mainly in China, and falling domestic ethylene demand. Cheaper overseas product makes it harder to fill idle capacity with exports.

Operating Rates Have Stayed Below the 90% Benchmark

In Japan, a 90% cracker operating rate is widely used as the line between healthy and weak market conditions. According to press reports, the rate was 76.2% in October 2025, the 39th straight month below 90%. The chairman of JPCA (also Asahi Kasei's president) described 2025 as a tough year with rates below 80%.

Crackers run most efficiently when they run continuously. At lower rates, fixed cost per ton climbs. The logic of consolidation is that one cracker running near full load costs less, and emits less CO2, than two running at partial load.

Domestic Capacity Also Exceeds Demand for Derivatives

Ethylene is not the only product in surplus. Asahi Kasei says domestic capacity for the products it will stop making at Mizushima is well above domestic demand. The 2024 figures below make the gap clear.

Figure 4: Japan's Capacity, Demand, and Production in 2024

For all three products, domestic capacity is well above domestic demand.

Styrene monomer

Capacity1,610

Demand1,070

Production1,300

Low-density polyethylene (LDPE)

Capacity2,060

Demand1,290

Production1,160

High-density polyethylene (HDPE)

Capacity1,080

Demand720

Production660

Unit: thousand metric tons. Capacity from METI's survey of major petrochemical production capacity (as of December 31, 2024); other figures from JPCA 2024 statistics, as compiled in Asahi Kasei's May 12, 2026 materials. Japan also imported 380,000 t of LDPE and 210,000 t of HDPE.

For LDPE, domestic capacity was 2.06 million tons against domestic demand of 1.29 million tons, and actual output was 1.16 million tons, with another 380,000 tons imported. Japan's LDPE plants ran at under 60% of capacity. If every producer holds on to some of its capacity, operating rates across the industry keep falling.

The Bigger Picture: Japan's Ethylene Cracker Consolidation

Western Japan is not acting alone. Cracker capacity is also being cut in Chiba and Kawasaki. According to press reports, Japan's 12 crackers will fall to 8 by around 2030.

The table below summarizes the main consolidations decided or under study.

Figure 5: Major Ethylene Consolidations in Japan

By around 2030, cracker numbers will fall in eastern and western Japan at the same time.

How

Timing and scale

Western Japan
(Asahi Kasei, Mitsubishi Chemical, Mitsui Chemicals)

Shut the AMEC cracker at Mizushima; consolidate at OPC's cracker. Run by a three-company joint entity

Target FY2030. 951,000 → 455,000 t/yr

Chiba
(Idemitsu Kosan, Mitsui Chemicals)

Shut Idemitsu's cracker; consolidate at Mitsui Chemicals' cracker. Jointly run through Chiba Chemicals Manufacturing LLP, set up in 2010

July 2027, after Idemitsu Chiba's turnaround. 920,000 t/yr (Idemitsu 370,000; Mitsui 550,000) into one cracker

Chiba
(Maruzen Petrochemical, Sumitomo Chemical)

Shut the cracker Maruzen runs on its own; consolidate at Keiyo Ethylene (reported)

FY2026 in the reports checked; reports differ on the exact timing

Kawasaki
(ENEOS)

Shutting one cracker under study (reported)

Under study

Western Japan and Chiba (Idemitsu / Mitsui) are from company announcements; the others are from Nikkei xTECH and Jiji Press reports. Capacities are for a turnaround year.

In both Chiba and western Japan, production will be consolidated at Mitsui Chemicals group facilities. Knowing where production is concentrating helps you judge which producers your future grades are likely to come from.

Polyolefin Makers Are Merging Too

Consolidation is also happening further downstream, in commodity resins. Sumitomo Chemical is folding its domestic polypropylene (PP) and linear low-density polyethylene (LLDPE) businesses into Prime Polymer, the Mitsui Chemicals–Idemitsu Kosan joint venture.

The December 2025 release planned the non-manufacturing part of the integration for July 1, 2026 (MONOist reports it has started) and the manufacturing part for April 1, 2027, subject to regulatory approvals. After integration, domestic capacity will be 1.59 million tons a year for PP and 720,000 tons for polyethylene. The three companies are targeting at least ¥8 billion a year in cost savings.

Through the late 2020s, Japan is set to have fewer crackers and fewer resin makers. For overseas buyers, that may mean more grade rationalization notices in the years ahead.

What Resin Buyers Outside Japan Will Face

Buyers care most about two things: whether they can get the volume they need, and what happens to price. The sections below separate what has been announced from the practical issues that follow from it.

Asahi Kasei's Mizushima PE and SM Will End Production

On May 12, 2026, Asahi Kasei announced a restructuring of some derivative businesses at its Mizushima Works to match the ethylene consolidation. The table below lists the affected products.

Product	Brand names	What happens
Styrene monomer (SM)	–	Production ends around FY2030. End of sales not yet decided; sales continue for now
Low-density polyethylene (LDPE, high-pressure process)	SUNTEC-LD, SUNTEC-EVA	Same as above
High-density polyethylene (HDPE, low-pressure process)	SUNTEC-HD, CREOLEX	Same as above
Acrylonitrile	–	Mizushima line scaled down around FY2030; production continues at Tongsuh Petrochemical in South Korea
Polycarbonate diol	DURANOL	Mizushima line stops around FY2030; production continues in China and elsewhere
Ultra-high-molecular-weight polyethylene (UHMWPE)	–	Continues

Asahi Kasei says it has set a transition period of about four years for the whole supply chain to move to substitute materials, and that stable supply is its top priority until then. In other words, the resin will not disappear tomorrow, but the switch needs to be finished by fiscal 2030.

Grade Changes Matter More Than Volume

Japan's overall polyethylene capacity still exceeds demand, so a general shortage is unlikely. What will hurt is losing a specific producer's grade and having to qualify a different one.

Even small differences in melt flow rate (MFR) or density can mean new molding conditions and a new round of part evaluation. Evaluation can take a long time for products that need customer approval or proof of compliance with standards. Two common cases:

• Automotive parts: if your customer requires AIAG PPAP (Production Part Approval Process), a change of material source may require notifying the customer under the PPAP manual. Whether notification or a full resubmission is needed depends on the customer's specific requirements, so confirm with them.
• Food packaging: in the US, polyolefins for food contact are covered by FDA 21 CFR 177.1520, and resin makers commonly issue compliance letters grade by grade. A replacement grade usually needs its own documentation, so ask the supplier.

Electrical parts face a similar issue: UL Yellow Cards for plastics are issued for a specific material designation, so a substitute grade should be checked against the end product's UL requirements. Rather than starting evaluation after a switch is forced on you, estimate how long it will take now and plan backward.

The figure below shows one way to plan backward. The durations are made up for illustration; your own will depend on the part and the customer.

Figure 6: Planning Backward from End of Production (Fictional Example)

A molder replacing an LDPE grade for an automotive part. Each step and duration is illustrative only.

Step 1 · NowMap your exposureList every part using the grade, including resin bought through compounders and trading companies

Step 2 · +3 monthsGet candidate gradesAsk the producer or distributor for successor-grade data sheets and samples

Step 3 · +6–12 monthsInternal trialsMolding trials, dimensional checks, and property tests on the candidate grade

Step 4 · +12–24 monthsCustomer approvalNotify the customer, submit data, and wait for approval (PPAP or equivalent)

Step 5 · Before FY2030Switch with a bufferChange over in production while the old grade is still available

FY2030 (target)Old grade ends productionEnd-of-sales date not yet decided

Fictional example. Durations are not taken from any supplier or customer requirement.

Hidden Exposure: Resin You Buy Through Others

Some overseas buyers never deal with the resin maker directly. Japanese resin may reach them through a trading company (shosha, 商社), a distributor, or a compounder that blends it into its own product. In that case, an end-of-production notice reaches you only if the intermediary passes it on.

Check which producer, and which plant, makes the base resin in each material you buy. A compounded grade from a Japanese compounder can contain a base polymer from Mizushima even if the compounder's name is the only one on the data sheet.

Reading a Japanese Discontinuation Notice

Some Japanese suppliers announce the end of production and the end of sales separately, as Asahi Kasei did. If a notice or a machine-translated email is unclear, look for these terms:

• 生産終了 (seisan shuryo): end of production
• 販売終了 (hanbai shuryo): end of sales; may come later than end of production
• 後継グレード (kokei guredo): successor grade recommended by the producer
• 代替品 (daitai-hin): substitute product, possibly from a different producer
• 品番集約 (hinban shuyaku): grade consolidation; several part numbers merged into fewer

A notice may also say 目途 (medo, "target" or "around"). Treat any date marked this way as a plan, not a firm date, and ask the supplier when it will be fixed.

Price: No Single Direction

Consolidation creates price pressure in both directions. Press reports say ethylene is expected to move by ship after consolidation, which adds handling and transport steps compared with direct pipeline links. On the other hand, a higher operating rate at the remaining cracker lowers fixed cost per ton.

In practice, resin prices respond more strongly to naphtha prices and exchange rates. When a price increase is proposed, ask for the feedstock and logistics data behind it rather than accepting "consolidation" as the reason.

Concentration Risk: One Cracker, Less Backup

When production is concentrated in one cracker, a turnaround or an unplanned outage at that cracker affects more customers. Idemitsu and Mitsui Chemicals scheduled their Chiba consolidation for after a turnaround, showing that the shutdown sequence and inventory build are critical to a smooth transition.

Feedstock is the other risk. Press reports say a naphtha shortage linked to tensions in the Middle East pushed Japan's cracker operating rate into the 60% range from March 2026. As supply from outside the region increased, the rate recovered to 73.5% in August, back in the 70% range for the first time in six months.

Fewer crackers means less slack when feedstock supply is disrupted. On the buyer side, ask about turnaround schedules and review safety stock for grades from a single plant.

Checklist: What to Verify Now

Use this list to map your exposure before the notices arrive.

• Grade inventory: every Japanese resin grade you use, with the part numbers and customers that depend on it
• Origin: producer and plant for each grade, including base resin inside compounds and material bought through trading companies
• Status: any announced end-of-production or end-of-sales date, and whether it is a target or a fixed date
• Successor: whether a successor grade exists, who makes it, and where
• Data gap: differences between old and new grades in MFR, density, additives, and color
• Approvals: which customer approvals and certifications (PPAP, food contact, UL) must be redone, and how long each takes
• Bridge stock: how much old-grade inventory you need to cover requalification, and whether the supplier can support it
• Price basis: naphtha, exchange rate, and logistics data to check any price change against

Questions for Your Japanese Supplier

Send these early to the producer, trading company, or compounder that sells you the resin:

• Is any grade we buy affected by the Mizushima shutdown or other cracker consolidation in Japan?
• Where is the base resin produced, and will that plant or line continue after fiscal 2030?
• What are the planned end-of-production and end-of-sales dates, and when will they be fixed?
• Is there a successor grade? Can you send a comparison of key properties and samples?
• Will regulatory documents (food contact letters, UL listing, RoHS/REACH declarations) be available for the successor grade?
• Can you support extra inventory or a last-time buy during our requalification?
• How will you notify us of future changes, and how much advance notice will we get?

Here is a short email template you can adapt.

Limits of This Article

• This article focuses on Asahi Kasei's announced changes. Watch for reviews of derivative businesses by Mitsubishi Chemical and other companies.
• How feedstock will reach the Mizushima derivative plants that continue after the shutdown is still under study.
• Dates marked "target" can change. Final terms of the joint entity will be set in a later agreement.
• Whether a grade change requires PPAP resubmission, new food contact documents, or new UL recognition depends on your customer, market, and product. Confirm with your customer and the supplier.
• Based on company announcements and press reports available as of November 2026 (listed below).

FAQ

How Many Ethylene Crackers Does Japan Have?

According to press reports, Japan has 12 crackers today and is expected to have 8 by around 2030. Shutdowns have been decided at Mizushima and at Idemitsu's Chiba site, and ENEOS is studying shutting one cracker in Kawasaki.

When Will the Mizushima Ethylene Cracker Shut Down?

The target is Japanese fiscal 2030, which runs from April 2030 to March 2031. Equipment work for the consolidation is scheduled to finish by the end of fiscal 2029.

Can I Still Buy Asahi Kasei's Mizushima Polyethylene?

Yes, for now. Asahi Kasei says the end of sales has not been decided and sales will continue for the time being. Production is planned to end around fiscal 2030, so plan to finish qualifying a replacement grade before then.

What Is an Ethylene Cracker Operating Rate, and What Is Normal?

It is the share of capacity a cracker actually uses. In Japan, 90% is the usual benchmark for healthy conditions. Crackers run most efficiently without interruption, so long periods below that level push up fixed cost per ton.

Will Consolidation Raise Resin Prices?

There are factors in both directions: more shipping of ethylene could add cost, while higher operating rates lower fixed cost per ton. Naphtha prices and exchange rates have a bigger effect on resin prices, so track those when you negotiate.

Sources

• Basic agreement, capacities, HtA program, investment, CO2 reduction: Asahi Kasei, Mitsui Chemicals, and Mitsubishi Chemical, joint release (January 27, 2026)
• Equity split of the joint operating entity: Asahi Kasei, Mitsui Chemicals, and Mitsubishi Chemical, joint release (May 12, 2026)
• Mizushima derivatives restructuring, brand names, domestic capacity and demand: Asahi Kasei, restructuring of some derivative businesses at Mizushima Works (May 12, 2026, Japanese)
• Ethylene capacity by producer: Japan Petrochemical Industry Association, capacity by producer (Japanese)
• Chiba consolidation: Idemitsu Kosan and Mitsui Chemicals, final agreement on Chiba ethylene consolidation (December 19, 2025)
• Polyolefin integration: Mitsui Chemicals, release (December 24, 2025); Sumitomo Chemical, release (September 10, 2025, Japanese); MONOist, start of domestic polyolefin integration (Japanese)
• Setouchi Ethylene LLP and start of talks: Newswitch (Japanese)
• 2025 operating rate: Newswitch, 39 straight months below 90% (Japanese)
• 2026 operating rates and naphtha supply: Kyoto Shimbun (Kyodo News) (Japanese); Plabase, Japan's ethylene shake-up
• 12 crackers to 8, ENEOS Kawasaki: Jiji Press (Japanese)
• Maruzen Petrochemical cracker shutdown: Nikkei xTECH (Japanese)
• Ethylene shipping after consolidation: RIM Intelligence (Japanese)
• FDA food contact regulation for olefin polymers: 21 CFR 177.1520, Cornell LII