1.1 本规范涵盖用于密封符合规范的石棉水泥管接头的橡胶圈 C296 , C428 , C668 和符合规范的非石棉纤维水泥管 第1449页 . 1.2 给出了( 1. )天然或合成橡胶环，或两者兼而有之，不需要耐油或耐溶剂，以及( 2. )耐油或耐溶剂的合成橡胶环。 1.3 以国际单位表示的数值应视为标准。括号中给出的值仅供参考。 1.4 警告- 吸入石棉粉尘是危险的。石棉和石棉制品对使用者及其接触者的健康风险已得到证实。除其他预防措施外，使用石棉水泥产品时，应尽量减少产生的粉尘。有关温石棉安全使用的信息，请参阅“温石棉的安全使用: 预防和控制措施手册” 2. 1.5 以下安全隐患警告仅适用于测试方法部分，第节 9 本标准的: 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 rubber rings used to seal the joints of asbestos-cement pipe conforming to Specifications C296 , C428 , C668 , and non-asbestos fiber-cement pipe conforming to Specification C1449 . 1.2 A specification is given for ( 1 ) natural or synthetic rubber rings, or both, where resistance to oil or solvents is not required, and ( 2 ) synthetic rubber rings for services involving resistance to oil or solvents. 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 Warning— Breathing of asbestos dust is hazardous. Asbestos and asbestos products present demonstrated health risks for users and for those with whom they come into contact. In addition to other precautions, when working with asbestos-cement products, minimize the dust that results. For information on the safe use of chrysotile asbestos, refer to “Safe Use of Chrysotile: A Manual on Preventive and Control Measures.” 2 1.5 The following safety hazards caveat pertains only to the test methods portion, Section 9 , of this standard: 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. 1.6 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.