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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Appendix specifying the requirements for a standard reference fuel, detailing the properties for Hexane.

Identifier  ExFiles\Box 27a\4\  Scan029
Date  9th December 1932 guessed
  
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APPENDIX I.

STANDARD REFERENCE FUEL. - The standard reference fuel shall consist of a mixture of equal volumes of pure crystallizable Benzene and Hexane to the following requirements.

HEXANE.- The material shall be water white and free from visible and odorous impurities.

DISTILLATION RANGE. - When distilled under standard conditions 97 per cent. shall distil between 67.50 and 69.50 C.

DENSITY. - The desnity at 15C. shall be between 0.685 and 0.695.

ANILINE POINT. - The aniline point of the hexane as determined by the I.P.T. shall be as follows:-

Before sulphonation - not less than 56.50 C.
After sulphonation - not less than 54.0 C.

(SIGNED) F.V. HOLT,

AIR COMMODORE,

DIRECTOR OF TECHNICAL DEVELOPMENT.
  
  


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