A2 Grade Fuel Oil Specifications

A2-grade fuel oil is used for off-road applications. Learn the required specifications of A2 grade fuel in BS 2869.

Specifications BS 2869 A2 Grade Fuel

A2 grade fuel is used for off-road applications on domestic and commercial levels, including agricultural machinery, boilers, generators, construction equipment, etc. It is the highest-grade diesel fuel that meets BS 2869 fuel specifications. Red diesel is an A2-grade fuel oil that is used in untaxed commercial and domestic vehicles and machinery.

Let’s learn about the specifications of A2-grade red diesel.

A2 Grade Red Diesel Specifications

Parameter

Maximum

Minimum

Typical

Unit

Appearance

Clear & bright, cherry red, free from visible sediments

Ash content

0.01

–

<0.01

% (m/m)

Carbon

–

–

87

% (m/m)

Carbon residue(Ramsbottom on 10% residue)

0.3

–

0.1

% (m/m)

Cetane number

–

45

48

–

Cold filter plugging point(1) Summer

-4

–

-8

°C

Cold filter plugging point(1) Winter

-12

–

-14

°C

Copper corrosion(3 hrs at 50°C)

1

–

1a

Class

Density at 15°C

–

0.82

0.86

kg/m³

Distillation recovery at 250°C

65

–

42

% (v/v)

Distillation recovery at 350C

–

85

92

% (v/v)

Fatty acid methyl ester (FAME)

7

–

<0.1

% (v/v)

Flashpoint (PMCC)

–

56

>62

°C

Gross specific energy (MJ/kg)

–

–

45.4

MJ/kg

Gross specific energy (MJ/litre)

–

–

38.8

MJ/litre

Hydrogen

–

–

12.75

% (m/m)

Kinematic viscosity at 40°C

5.5

1.5

3

mm²/s

Lubricity (HFRR)

460

–

<460

µm

Mean specific heat capacity over 0 – 100°C

–

–

2.05

KJ/kg °C

Nitrogen

–

–

0.01 – 0.05

% (m/m)

Oxidation stability 0.0 – 7.0% FAME

25

–

–

g/m³

Oxidation stability 2.0 – 7.0% FAME

–

20

–

h

Particulate content

24

–

<10

mg/kg

Strong acid number

nil

–

nil

mg KOH/g

Sulphur content

0.002

–

<0.098

% (m/m)

Volume correction factor

–

–

0.00081

per °C

Water content

200

–

<100

mg/kg