China's high-energy synthetic kerosene boosts Long March payload by 10%
Synopsis
China's Long March-12 rocket flew on a new high-energy synthetic kerosene developed by CASC that boosts specific impulse by 8 seconds and payload capacity by 10% — no new airframe required. It is a propellant-level leap that could reshape China's commercial launch economics.
Key Takeaways
China's Long March-12 rocket, launched in the week of 23 June 2026 , used a new high-energy synthetic kerosene fuel for the first time.
The new propellant increases payload capacity by 10 per cent without any structural modifications to the rocket.
Engine specific impulse — a measure of fuel efficiency — improved by approximately 8 seconds , according to CASC .
The fuel was developed by the Beijing Aerospace Test Technology Research Institute , a CASC subsidiary.
Traditional refined-petroleum kerolox propellants have reached their performance limits, driving the shift to synthetic alternatives.
The advance supports China's expanding commercial satellite and lunar mission manifest from the Hainan launch complex.
China's Long March-12 rocket, launched in the week of 23 June 2026, flew on a newly developed high-energy synthetic kerosene fuel that increased the rocket's payload capacity by 10 per cent, according to the fuel's developer, the Beijing Aerospace Test Technology Research Institute, a subsidiary of China Aerospace Science and Technology Corporation (CASC).
What the new fuel does differently
Most orbital rockets today rely on liquid oxygen-kerosene (kerolox) engines burning refined petroleum-based propellant — a formulation that researchers say has now reached its performance ceiling. Rather than scaling up rocket airframes, which adds cost and complexity, CASC engineers focused on maximising the energy density of the propellant itself.
The new synthetic kerosene raises the engine's specific impulse — a standard measure of propulsive efficiency analogous to fuel economy in automobiles — by approximately eight seconds, according to the corporation. That improvement translates directly into the 10 per cent payload gain without any structural changes to the rocket.
Why it matters for China's space ambitions
China is pursuing an accelerating manifest of lunar missions and is deploying growing numbers of commercial satellites into orbit, placing sustained upward pressure on payload demand. Squeezing more lift from existing rocket designs offers a faster and cheaper path to heavier payloads than developing entirely new launch vehicles.
The Beijing Aerospace Test Technology Research Institute has been developing the synthetic propellant as part of CASC's broader push to keep its heritage kerolox engines competitive as mission requirements grow.
The competitive backdrop
The advance arrives as China's commercial launch sector intensifies competition with established players. SpaceX's Falcon Heavy and the broader Falcon family set the global benchmark for reusable kerolox performance, while domestic Chinese commercial operators are developing their own next-generation vehicles. A propellant-level efficiency gain that can be retrofitted to existing engines — rather than requiring new hardware — gives CASC a near-term advantage in the commercial satellite market centred around the Hainan launch complex.
What's next
The successful debut on Long March-12 positions the high-energy synthetic kerosene for broader adoption across CASC's kerolox fleet. Analysts will watch whether the fuel is cleared for crewed mission profiles and whether the specific-impulse gain holds across repeated engine firings — a key qualification hurdle for operational certification.
If the technology scales as demonstrated, it could meaningfully reduce per-kilogram launch costs for China's commercial satellite operators and sharpen the competitive edge of Long March rockets on the international launch market.
Point of View
Which is almost always cheaper and faster than building bigger. Mainstream coverage tends to fixate on rocket size and reusability, missing that specific-impulse gains at the propellant level compound across every mission in the manifest. With SpaceX's Falcon family setting the kerolox benchmark and Chinese commercial rivals racing to close the gap, a fleet-wide 10 per cent payload uplift from a fuel swap is a durable, hard-to-replicate advantage that will pressure competitors who lack equivalent materials-science depth.
NationPress
23 Jun 2026
Frequently Asked Questions
What is China's new high-energy synthetic kerosene rocket fuel?
It is a newly developed synthetic propellant designed by the Beijing Aerospace Test Technology Research Institute , a CASC subsidiary, to replace conventional refined-petroleum kerosene in liquid oxygen-kerosene rocket engines. The fuel raises engine specific impulse by approximately 8 seconds and increases payload capacity by 10 per cent .
Which rocket first used the new Chinese synthetic kerosene fuel?
China's Long March-12 rocket was the first to fly on the new high-energy synthetic kerosene, in a launch that took place in the week of 23 June 2026 . The successful mission marked the operational debut of the propellant.
Why does a 10% payload increase matter for China's space programme?
A 10 per cent payload gain means heavier satellites or more cargo can reach orbit on the same rocket without costly redesigns, directly supporting China's accelerating commercial satellite deployments and lunar mission programme. It also reduces per-kilogram launch costs, making Long March vehicles more competitive on the international market.
How does China's new rocket fuel compare to SpaceX's Falcon engines?
SpaceX's Falcon family uses the Merlin engine burning refined kerosene and liquid oxygen, setting the current global performance benchmark for kerolox propulsion. CASC 's synthetic kerosene targets the same engine category but claims a specific-impulse improvement that, if validated across repeated firings, would narrow or close the efficiency gap with the Falcon platform.
Will the new synthetic kerosene be used on other Long March rockets?
The debut on Long March-12 is expected to pave the way for broader adoption across CASC 's kerolox rocket fleet, though operational certification — including qualification for crewed missions — will require additional testing. CASC has not publicly announced a timeline for fleet-wide rollout.
