Shanghai Sinpar Scientific Instrument Co.,Ltd.
Reagents and Reference Fuels for Octane Engine

Reagents and Reference Fuels for Octane Engine

The reagents and reference fuels for octane engine are specified by ASTM D2699 and ASTM D2700 methods.

1. Octane Engine Cylinder Jacket Coolant:

Water shall be used in the cylinder jacket for laboratory locations. The resultant boiling temperature shall be 100 °C±1.5 °C (212 °F ±3 °F).

Water with commercial glycol-based antifreeze added in sufficient quantity to meet the boiling temperature requirement shall be used when laboratory altitude dictates. A commercial multifunctional water treatment material should be used in the coolant to minimize corrosion and mineral scale. That can alter heat transfer and rating results.

2. Octane Engine Crankcase Lubricating Oil:

An SAE 30 viscosity grade oil meeting the current API service classification for spark-ignition engines shall be used. It shall contain a detergent additive and have a kinematic viscosity of 9.3 mmto 12.5 mm2 per s (cSt) at 100 °C (212 °F) and a viscosity index of not less than 85. Oils containing viscosity index improvers shall not be used. Multigraded oils shall not be used.

3. PRF, isooctane and normal heptane classified as reference fuel grade and meeting the specifications that follow:

Isooctane shall be no less than 99.75 % by volume pure, contain no more than 0.10 % by volume n-heptane, and contain no more than 0.5 mg ⁄L (0.002 g ⁄U.S. gal) of lead.

n-heptane shall be no less than 99.75 % by volume pure, contain no more than 0.10 % by volume isooctane and contain no more than 0.5 mg ⁄L (0.002 g ⁄U.S. gal) of lead.

80 octane PRF blend, prepared using reference fuel grade isooctane and n-heptane shall contain 80 % ± 0.1 % by volume isooctane.

Dilute Tetraethyllead (Commonly referred to as TEL Dilute Volume Basis) is a prepared solution of aviation mix tetraethyllead antiknock compound in a hydrocarbon diluent of 70 % (V/V) xylene, 30 % (V/V) n-heptane.

Toluene, Reference Fuel Grade shall be no less than 99.5 % by volume pure. Peroxide number shall not exceed 5 mg per kg (ppm). Water content shall not exceed 200 mg per kg.

Check Fuels are in-house typical spark-ignition engine fuels having selected octane numbers, low volatility, and good long-term stability.

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