Reaction Engines' milestone is the result of twenty years' work by the company's founders Alan Bond, Richard Varvill and John Scott, the Financial Times' reported.
The Times reports pre-cooler lowers the temperature of compressed air rushing through an engine from more than 1,000C to room temperature in one twentieth of a second.
There are three core elements to the Sabre engine; the pre-cooler, the engine core that has a a smart thermodynamic cycle to manage heat and fluid flow, and the thrust chamber situated at the rear.
Here, it would be ignited along with stored liquid hydrogen and then switch at high altitude, burning liquid oxygen and liquid hydrogen from on-board fuel tanks.
It did this by successfully quenching a 420°C (788°F) stream of gases in less than 1/20th of a second.
Reaction said this morning that its precooler heat exchanger had "successfully achieved all test objectives in the first phase of high-temperature testing created to directly replicate supersonic flight conditions".
"This is a hugely significant milestone which has seen Reaction Engines' proprietary precooler technology achieve unparalleled heat transfer performance", Mark Thomas, the company's CEO, said in a press release.
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