【国外标准】 Standard Specification for Asbestos Roving (Withdrawn 2022)

This specification covers asbestos roving have a specified minimum of mass % asbestos fiber, excluding the mass of other inorganic reinforcing strands which may be present. Asbestos roving covered here are classified into classes (Classes A, B, C, D, and E) according to structural component, grades (Commercial, Underwriters', A, AA, AAA, and AAAA) according to percentage of asbestos content by mass, and electrical insulation type (Types II, IV, and VI) according to magnetic rating. Specimens shall be sampled, prepared, tested, and conform accordingly to specified chemical composition (reinforcement and asbestos content), electromagnetic (electrical insulation), mechanical (tensile or breaking strength), and dimensional (roving number or linear density) property requirements.1.1 This specification covers asbestos roving having a minimum of 75 mass % asbestos fiber, excluding the mass of other inorganic reinforcing strands which may be present.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 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 chrysoltile asbestos, refer to “Safe Use of Chrysotile Asbestos: A Manual on Preventive and Control Measures.”21.4 The following safety hazards caveat pertains only to the test methods, Section 13, described in this specification: 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific safety hazard warning, see 1.3.1.5 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.