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?WarningBreathing 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.