ASTM C220-91(2009)

1.1 This specification covers asbestos-cement sheets in flat form designed for industrial, commercial, and general building purposes, of the following types:

1.1.1 Flat Sheets, Type F (Flexible) - An asbestos-cement flat sheet suitable for exterior and interior use, where a board having higher strength and density, smoother surface, greater flexibility, and lower moisture absorption is desired.

1.1.2 Flat Sheets, Type U (Utility) - An asbestos-cement flat sheet suitable for exterior and interior use, having sufficient strength for general utility and construction purposes, and where a board having maximum flexibility, highest density, smoother surface, and lower moisture absorption is not essential.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 chrysotile asbestos, refer to "Safe Use of Chrysotile: A Manual on Preventive and Control Measures."

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 and health practices and determine the applicability of regulatory limitations prior to use.