1.1 本规范涵盖拟在1℃与汽油混合的丁醇 % 至12.5 % 按体积计，用作汽车火花点火发动机燃料。 1.1.1 丁醇含有22 % 以氧气质量计。丁醇与汽油混合物的氧质量百分比取决于丁醇混合物的体积百分比、丁醇异构体的密度和基础混合物的密度。 1.1.2 混合的最大限制不是性能限制，而是美国当前的监管限制。 1.2 本规范涵盖三种丁醇异构体:1-丁醇、2-丁醇和2-甲基-1-丙醇。本规范明确排除2-甲基-2-丙醇（即， tert公司 -丁醇）。 1.2.1 Tert公司 -丁醇与其他三种异构体具有不同的物理性质（熔点、水溶性）。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers butanol intended to be blended with gasoline at 1 % to 12.5 % by volume for use as an automotive spark-ignition engine fuel. 1.1.1 Butanol contains 22 % by mass oxygen. The mass percent of oxygen of a butanol blend with gasoline depends on the volume percent of butanol blended, the density of the butanol isomer, and the density of the base blendstock. 1.1.2 The maximum limit on blending is not a performance limit but a current regulatory limit in the United States. 1.2 This specification covers three butanol isomers: 1-butanol, 2-butanol, and 2-methyl-1-propanol. This specification specifically excludes 2-methyl-2-propanol (that is, tert -butyl alcohol). 1.2.1 Tert -butyl alcohol has different physical properties (melting point, water miscibility) than the other three isomers. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.