ASTM_C_725_-_90_2014.pdf

Designation:C72590(Reapproved 2014)Standard Specification forSemidense Mineral Fiber Siding1This standard is issued under the fixed designation C725;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers semidense mineral fiber siding(shingles,clapboards,and sheets)designed to provide protec-tion for the weather-exposed sidewall surfaces of buildings.These sidings are nailable with or without prepunched holes.1.2 The values stated in SI units are to be regarded as thestandard.The values stated in parentheses are provided forinformation only.1.3 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks 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 informa-tion on the safe use of chrysoltile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”21.4 The following precautionary caveat pertains only to thetest method portion,Section 9,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.For a specific hazard warning,see 1.3.2.Referenced Documents2.1 ASTM Standards:3C460 Terminology forAsbestos-Cement(Withdrawn 2001)4D1037 Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials2.2 Federal Standard:Fed.Std.No.123 Marking for Shipment(Civil Agencies)52.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage53.Classification3.1 Semidense mineral fiber siding shall be one of thefollowing types,as specified:3.1.1 Type I,ShinglesUniform thickness,rectangular inshape,and having wavy,random,thatched,straight or irregularbutts.Shingles are limited to 1.22 m(48 in.)in maximumlength and 0.41 m(16 in.)in maximum width.Shingles areapplied in horizontal lapped courses.The specified width isgenerally less than the specified length.3.1.2 Type II,ClapboardsUniform thickness,rectangularin shape and in lengths from 1.24 m(49 in.)to 3.66 m(144 in.)and widths up to 0.41 m(16 in.).The clapboards are applied inhorizontal lapped courses.3.1.3 Type III,SheetsUniform thickness,rectangular inshape and usually in 1.22-m(48-in.)widths and 1.22 to 3.66-m(48 to 144-in.)lengths.The sheets are generally appliedvertically to sheathed or unsheathed sidewalls.4.Materials and Manufacture4.1 Semidense mineral fiber sidings are composed of acombination of asbestos fibers,portland cement or portlandblast-furnace slag cement and mineral fillers,with or withoutthe addition of organic fibers,curing agents,water repellentsubstances,coatings,or pigments,formed under pressure andcured to meet the physical requirements of this specification.5.Physical Properties5.1 Flexural StrengthThe average breaking load obtainedby loading equally and simultaneously at both one-third pointsof the span shall not be less than as shown in Table 1.5.2 DeflectionAt the ultimate breaking load obtained byloading equally and simultaneously at both one-third points ofthe span shall not be less than as shown in Table 1.1This specification is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1972.Last previous edition approved in 2008 as C725 90(2008).DOI:10.1520/C0725-90R14.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.5Available from Standardization Documents,Order Desk,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Water-Absorption SwellingThe average thickness in-crease resulting from water absorption shall not exceed 2%.5.4 Product DurabilityThe product shall withstand sixcomplete cycles of accelerated aging conducted in accordancewith Section 120 of Test Methods D1037,and exhibit novisible delamination.The average breaking load of the driedtest specimens after cycling shall not