1.1 本规范涵盖环己烷原料用苯。 1.2 以下内容适用于本标准中的所有规定限值:为了确定是否符合本标准，应根据修约实践方法，将观察值或计算值修约到用于表示规范限值的最后一个右手数字中的“最接近的单位” E29年 . 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 有关本规范中使用的所有材料，请参阅当前OSHA法规供应商的安全数据表。 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 benzene for cyclohexane feedstock. 1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29 . 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 Consult current OSHA regulations supplier’s Safety Data Sheets for all materials used in this specification. 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.