1. SCOPE 1.1 This standard applies to three types of middle distillate fuel oils that are suitable for use in liquid-fuel-burning
equipment without preheating (Types 0, 1 and 2), and three types of fuel oils that contain residual fuel components
and require preheating (Types 4, 5 and 6). 1.2 The heating fuel oils covered by this standard are intended for use in oil burning equipment to generate heat for
domestic and industrial purposes. 1.2.1 Types 0, 1 and 2 fuel oils are primarily for use in domestic-type oil burners. They may also be used for some
industrial purposes. a. Type 0 fuel oil is intended for use in fuel oil burning appliances that have outside storage and where ambient
temperatures as low as -48°C could be encountered. b. Type 1 fuel oil is intended primarily for use in sleeve-type and wick-feed burners, and in most vaporizing
pot-type burner applications. It is also intended for atomizing burners in which Type 2 fuel oil cannot be used
satisfactorily. During periods of lower ambient temperature, Type 1 fuel oil may be used in place of Type 2 to
minimize waxing problems. c. Type 2 fuel oil is a heavier distillate than Type 1 and is intended for use in most atomizing-type burner
applications. This type of fuel oil is used in most domestic burners (furnaces and boilers) and in some medium
capacity commercial and industrial burners. Type 2 may contain up to 5% biodiesel. 1.2.2 Types 4, 5 and 6 fuel oils are primarily for use as industrial fuels: suitable for use in the pulp and paper industry,
metallurgical operations, heat or power generation, etc. a. Type 4 is an industrial fuel oil intended primarily for burner installations equipped with limited preheating
facilities or with no preheating. b. Type 5 is a residual fuel oil for burner installations equipped with limited preheating facilities that require a
fuel oil of lower viscosity than Type 6. c. Type 6 is a high-viscosity residual fuel oil for use in burners equipped with preheating facilities to handle such
fuels. 1.3 The testing and evaluation of a product against this standard may require the use of materials and/or equipment
that could be hazardous. This document does not purport to address all the safety aspects associated with its use.
Anyone using this standard has the responsibility to consult the appropriate authorities and to establish appropriate
health and safety practices in conjunction with any applicable regulatory requirements prior to its use.