---
title: "CE-20 Cryogenic Engine: ISRO Upper Stage | Model Diplomat"
description: "The CE-20 is ISRO's cryogenic engine that powers the LVM3 upper stage, crucial for missions like Chandrayaan-3 and Gaganyaan, and a UPSC GS3 topic."
url: "https://modeldiplomat.com/learn/glossary/cryogenic-engine-ce-20"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The CE-20 is an Indian cryogenic rocket engine developed by ISRO that burns liquid hydrogen and liquid oxygen to power the upper stage of the LVM3 launch vehicle.
- Why did India develop the CE-20 indigenously rather than importing the technology?
- What is the difference between the CE-20 and the CE-7.5 engine?
- Is the CE-20 being used for India's human spaceflight programme?
- Why is the CE-20 distinct from a semi-cryogenic engine?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

The CE-20 is an Indian cryogenic rocket engine developed by ISRO that burns liquid hydrogen and liquid oxygen to power the upper stage of the LVM3 launch vehicle.

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## Positions at a glance

### Supporters

Controversy and edge cases surround the engine's development lineage and its reliability record. The 1992 MTCR denial remains a touchstone in Indian strategic discourse on technology sanctions and self-reliance, frequently invoked in arguments for indigenous capability under the Atmanirbhar Bharat framing. The GSLV Mk II's early cryogenic stage suffered a failure in April 2010, underscoring the difficulty of the technology, though the CE-20 itself has flown successfully on every LVM3 mission to date. Recent developments include the qualification of higher-thrust variants and extended-duration firings to support the heavier payloads anticipated for Gaganyaan and future deep-space missions, alongside ISRO's stated intent to develop reusable and more powerful successors.

### Opponents

The CE-20 burns a cryogenic propellant combination of liquid hydrogen (LH2, stored near −253°C) as fuel and liquid oxygen (LOX, near −183°C) as oxidiser, a pairing that delivers among the highest specific impulse of any chemical propellant. Procedurally, the propellants are stored in insulated tanks within the C25 stage; turbopumps driven by a gas generator pressurise and feed them into the combustion chamber, where ignition produces thrust in the vacuum of space after the lower stages separate. The engine generates a nominal thrust of approximately 200 kilonewtons, uprated in later configurations toward 220 kN. Cryogenic combustion's difficulty lies in handling propellants stored hundreds of degrees below ambient temperature, sealing them against leakage, and managing the thermal stresses of igniting them—engineering challenges that only a handful of states have mastered.

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Example

In July 2023, ISRO's LVM3 rocket used a CE-20-powered C25 upper stage to launch Chandrayaan-3, which subsequently achieved India's first soft landing near the Moon's south pole.

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