Material Insights · Understanding the Material World

Ethylene and Polyethylene (LDPE, LLDPE)

Polyethylene is the main use of ethylene, taking more than 60% of it across all grades, so cracker earnings rise and fall with polyethylene demand. Owners of both the cracker and the polymer line keep the whole chain margin, but the wave of new capacity, led by China, has kept even integrated Asian margins weak since late 2021.

Ethylene (chemical) and Polyethylene (LDPE, LLDPE) (chemical): 4 relationships.

How they are linked

1. Main feedstock

Physical flow · Strong · Ethylene to polyethylene

Polyethylene is made by polymerising ethylene, so polyethylene demand, mostly packaging film, is the largest pull on cracker output.

  • more than 60% of world ethylene goes to the polyethylene chain, all grades
  • 184 Mt world ethylene consumption, 2024

World ethylene use rose from 157 Mt in 2018 to 184 Mt in 2024. The 60% share covers HDPE as well as the LDPE and LLDPE in this pair. The next outlets are far smaller: ethylene dichloride for PVC takes about 15% and ethylene oxide for glycols about 8%, so no other derivative can absorb a polyethylene slowdown.

Sources: Alchem Pro

2. Integrated cracker and PE plants

Joint production · Strong · Cracker and polymer line on one site

A producer that owns both steps earns the ethylene margin and the polymer margin together, so it can keep running when the ethylene to naphtha spread is too thin for a stand-alone cracker.

  • $250/t ethylene to naphtha spread needed by integrated producers, NE Asia, 2025
  • $300 to $350/t spread needed by non-integrated producers
  • about $237/t actual spread, 10 September 2025

In September 2025 the spread sat below both breakevens, so even integrated Asian naphtha producers were losing money. Argus put the integrated polyethylene margin in Northeast Asia at about minus $500/t at its low in March 2022. Integration softens a downturn but does not remove it when the whole chain is oversupplied.

Sources: Argus Media; S&P Global Commodity Insights

3. Price link: main product

Cost and price · Strong · Both ways

Most ethylene is sold or transferred into polyethylene, so monomer and resin are priced off the same film and packaging demand.

  • 0.71 monthly change correlation
  • 0.89 12-month change correlation
  • 0.53 fitted elasticity

Monthly price changes correlate at 0.71 and yearly changes at 0.89, and the yearly link was 0.85 over the last five years. A fitted elasticity of 0.53 means the resin proxy moves by about half the percentage change of the ethylene proxy, as converters' margins absorb part of each swing.

Sources: Material Insights (World Bank, FRED, IMF data)

4. Shared capacity cycle

Cost and price · Strong · Overbuilding hits both

New crackers are usually built with new polyethylene lines, so a wave of capacity depresses ethylene and resin prices at the same time.

  • more than 10 Mt/yr ethylene capacity China added in 2024 to 2025
  • about 6.5 Mt/yr ethylene capacity expected to shut worldwide, 2020 to 2028

Argus records Northeast Asian naphtha cracking margins as deeply negative from late 2021. Japan plans to retire at least three naphtha crackers by 2028, and South Korean producers, under a government restructuring push, plan to cut 2.7 to 3.7 Mt/yr, about 18 to 25% of national cracker capacity. S&P expects Asian olefins margins to stay negative until after 2030.

Sources: Argus Media; S&P Global Commodity Insights; The Korea Times

For investors

Key learnings

  1. More than 60% of ethylene ends up in polyethylene, so film and packaging demand is the main driver of cracker earnings.
  2. Integration lowers the ethylene to naphtha spread a producer needs to about $250/t from $300 to $350/t, but in September 2025 even that was not covered in Northeast Asia.
  3. Recovery depends on closures in Japan and South Korea offsetting Chinese additions of more than 10 Mt/yr in 2024 to 2025; S&P does not expect positive Asian olefins margins before 2030.

What to track

  • Ethylene to naphtha spread, CFR Northeast Asia: Below about $250/t even integrated Asian producers lose money; a sustained rise signals recovery (Weekly · Platts, Argus, ICIS)
  • LLDPE film price minus ethylene: Shows where the chain margin sits between monomer and polymer (Weekly · Platts, ChemOrbis)
  • Cracker closures and start-ups: Net capacity change sets the length of the downturn (Quarterly · company announcements, S&P)

For policymakers

Key learnings

  1. India's ethylene capacity, about 8.8 Mt in 2024-25 and projected above 9.4 Mt by 2026 to 2028, will add polyethylene to a world market that is already oversupplied.
  2. South Korea is steering cracker cuts through a government-led restructuring and Japan plans to retire at least three naphtha crackers by 2028, a sign that naphtha crackers without cheap feed struggle in this cycle.
  3. Because most ethylene is turned into polymer at the cracker site, import pressure arrives as polyethylene resin, so trade and quality rules act at the resin stage.

What to track

  • India ethylene and polyethylene capacity additions: Whether new supply cuts imports or adds export pressure (Annual · MoPNG, company reports)
  • Polyethylene import volumes and prices into India: Rising cheap imports signal pressure on domestic crackers (Monthly · DGCI&S, ChemOrbis)

India

India had about 8.8 Mt of ethylene nameplate capacity in 2024-25, with over 9.4 Mt projected by 2026 to 2028; with polyethylene the largest outlet worldwide, much of the new supply will compete with imported resin.

Sources

  1. Global ethylene demand rises, India expands capacity, prices drop sharply in 2018 to 2025, Alchem Pro (2025)
  2. Post-pandemic cracker margins: when will northeast Asia margins turn positive?, Argus Media (2024)
  3. APPEC: Asian olefins oversupply may last 3-4 years amid slower capacity growth, S&P Global Commodity Insights (2025)
  4. Price correlation, Material Insights, Material Insights (World Bank, FRED, IMF data)
  5. Petrochemical firms to cut 3.7 mil. tons in NCC capacity through restructuring: minister, The Korea Times (2025)