1、Designation: C 725 90 (Reapproved 2003)e1Standard Specification forSemidense Mineral Fiber Siding1This standard is issued under the fixed designation C 725; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、 A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTEAsbestos warning was moved from 9.2.1.1 to 1.3 in Septem
3、ber 2004.1. 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
4、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,
5、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,
6、 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
7、prior to use. For a specific hazard warning, see 1.3.2. Referenced Documents2.1 ASTM Standards:3C 460 Terminology for Asbestos-Cement4D 1037 Test Methods of Evaluating the Properties of Wood-Base Fiber and Particle Panel Materials2.2 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Age
8、ncies)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.
9、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 (
10、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
11、 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 repellen
12、tsubstances, 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
13、shown in Table 1.1This specification is under the jurisdiction of ASTM Committee C17 onFiber-Cement Products and is the direct responsibility of Subcommittee C17.03 onAsbestos-Cement Products.Current edition approved Jan. 10, 2003. Published July 2003. Originallyapproved in 1972. Last previous editi
14、on approved in 1998 as C 725 90(1998).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
15、onthe ASTM website.4Withdrawn.5Available from Standardization Documents, Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 DeflectionAt the u
16、ltimate breaking load obtained byloading equally and simultaneously at both one-third points ofthe span shall not be less than as shown in Table 1.5.3 Water-Absorption SwellingThe average thickness in-crease resulting from water absorption shall not exceed 2 %.5.4 Product DurabilityThe product shall
17、 withstand sixcomplete cycles of accelerated aging conducted in accordancewith Section 120 of Test Methods D 1037, and exhibit novisible delamination. The average breaking load of the driedtest specimens after cycling shall not show a decrease instrength of more than 10 % when compared with the corr
18、e-sponding values obtained from tests made on companioncontrol specimens tested in accordance with 5.1.5.5 DensityThe average density as measured in the drystate shall be not less than 800 kg/m3(50 lb/ft3).5.6 Refer to Terminology C 460 for terminology.6. Dimensions, Mass, and Permissible Variations
19、6.1 Siding covered by this specification shall conform to thedimensions prescribed in Table 2.6.2 TolerancesThe permissible variation from the nomi-nal width or length shall be 3.2 mm (618 in.), and theminimum thickness shall be 7.5 mm (0.30 in.) for nominal38-in. thick product and 6.1 mm (0.24 in.)
20、 for nominal14-in.thick product as measured after conditioning for a minimum of24hat706 3F (216 1.6C) and 50 % relative humidity. Thedeviation from squareness shall not exceed 1.3 mm/m (164in./ft) of width or length when measured with a feeler gage and0.61-m (2-ft) metal carpenters square.7. Workman
21、ship, Finish, and Appearance7.1 WorkmanshipThe product shall be free of defects thatwill impair appearance, erection, or serviceability.7.2 Color and FinishThe exposed surface of the sidingmay be smooth, granuled, or otherwise textured as specified.The natural color is a light tan or gray and the su
22、rface may beuncoated, factory primed, or prefinished, as specified.7.3 Holes for Nails and Fasteners:7.3.1 Type I, ShinglesUnless otherwise specified, shinglesshall be furnished with nail holes so placed as to provide aminimum top lap of 25.4 mm (1 in.).7.3.2 Type II, ClapboardsUnless otherwise spec
23、ified,clapboards shall be supplied without nail holes. These productsare nailable and intended to be applied to provide a minimumtop lap of 25.4 mm (1 in.).7.3.3 Type III, SheetsSheets are supplied without nailholes, and are normally applied vertically in accordance withaccepted practices.8. Nails8.
24、1 Nail MaterialsAll nails shall be of nonstaining,corrosion-resistant material.8.2 Type I ProductThe face nails for Type I shingles shallbe furnished by the shingle manufacturer and have shankssized to enter the nail holes where provided in the units. Thenails shall be long enough to hold the siding
25、 units securely toa nailing base.8.3 Type II and Type III ProductsThe nails used with TypeII and Type III products shall be of sufficient length to providea minimum 25.4-mm (1-in.) penetration into the studs whensheathing is used and a minimum 38-mm (112-in.) penetrationinto the studs when sheathing
26、 is omitted.9. Sampling and Test Procedures9.1 Sampling FrequencyFrom each shipment or fractionthereof representing a product of the same type, a number ofshingles, clapboards, or sheets shall be taken at random. Table3 shows the number of units to be taken from shipments ofvarious sizes.9.2 Flexura
27、l Strength and Deflection Tests:9.2.1 Preparation of Test SpecimensCut a single speci-men 150 6 2mm(66116 in.) in width and 300 6 2mm(126116 in.) in length from each unit. Cut the specimens in such amanner that the 300-mm (12-in.) dimension of each specimenis parallel to the long dimension for Types
28、 II and III. For TypeI, cut one half of the specimens as above and cut one half at aright angle thereto, provided that the shingle size permits. Donot test cracked or otherwise damaged specimens, but providesubstitute specimens.9.2.1.1 Warningsee 1.3.9.2.2 ProcedureDry each 150 3 300-mm (6 3 12-in.)
29、specimen to constant mass in a ventilated oven at a temperatureof 100 to 105C, (212 to 220F), and cool to room temperaturein a desiccator. Record the dry mass of each cooled specimen.Determine the flexural strength of each specimen by placingthe specimen on supports that cannot exert longitudinal co
30、n-straint rocker-type bearing edges, rollers, etc., with a 3.2-mm(18-in.) minimum and a 13-mm (12-in.) maximum radius andapplying the load at midspan through a similar edge bearingagainst the finished surface of the specimen. The test span shallbe 254 6 2mm(106116 in.) and the load lines and support
31、sshall be parallel. Mount a dial micrometer reading to 0.02 mm(0.001 in.), or an equally sensitive apparatus to bear on thespecimen at midspan, to determine the deflection of thespecimen at the center of the test span. Increase the loadapplied at a uniform rate such as will result in failure of thes
32、pecimen in approximately 1 min. The error in the load readingshall not exceed 2 N (0.5 lbf). Record the deflection for eachspecimen at maximum load. Take the flexural strength as theultimate load, in newtons (or pounds-force).9.3 Water Absorption Swelling:9.3.1 Sample PreparationFor swelling tests,
33、prepare a setof specimens 305 by 305 mm (12 by 12 in.) with all four edgestrimmed less than 12 in., all units shall be cut with the 12-in.dimension of each specimen parallel to the long dimension ofthe unit. The width dimension shall be that of the specimen forspecimens less than 12 in. wide.TABLE 1
34、 Physical RequirementsNominalThicknessFlexuralStrengthDeflectionin. mm lbf N in. mmType I38 9.5 40 178 0.10 2.54Type II38 9.5 75 334 0.12 3.05Type III38 9.5 75 334 0.12 3.0514 6.4 50 222 0.10 2.54C 725 90 (2003)e129.3.2 Thickness Measurement for Swelling TestMeasurethe thickness of each test specime
35、n by placing a smooth metalplate of uniform thickness and with dimensions approximately0.4 by 101 by 101 mm (164 by 4 by 4 in.) against the finished,textured, or weather-exposed surface of the specimen. Using amicrometer caliper reading to 0.03 mm (0.001 in.), measure theoverall thickness of metal p
36、late and specimen at the approxi-mate midpoint of each edge of the specimen and at least 12.7mm (12 in.) from the edge of the specimen. Subtract themeasured thickness of the metal plate from each measurementand average the four measurements to give the specimenthickness.9.3.3 ProcedureDry the specim
37、ens that are prepared inaccordance with 10.3.1 for 24 6 1 h at a temperature of 220 65F (104 6 3C). Measure the thickness of each specimen inaccordance with 10.3.2. Submerge the specimens horizontallyunder 1 in. of water maintained at 70 6 5F (21 6 3C) for 24h. Remove and blot off surface water, rem
38、easure the thicknessat the same locations on the specimen, and express the swellingas percentage of thickness increase based on the thickness afterconditioning.9.4 Product DurabilityRepeat the preparation of a secondset of test specimens in accordance with 10.2.1. Subject this setof test specimens t
39、o accelerated aging cycles in accordancewith Test Methods D 1037. At the end of the cycling procedure,examine each specimen and record any visible evidence ofswelling, checking or cracking. Test the samples for flexuralstrength in accordance with 10.2.2 and the requirements of 5.4.9.5 DensityWeigh t
40、he dry specimens that have been usedin the flexural strength test and submerge them for 24 612 hin clean water at from 60 to 80F (15.5 to 27C). Then weigheach sample while submerged in water, and reweigh in air afterblotting off surface water. The balances used for the weighingsshould be accurate to
41、 0.5 %. Report the density as the averagevalue for all specimens tested. Calculate the density for eachspecimen as follows:Wet mass in air, g mass in water, g 5 volume, cm3(1)Density, lb/ft35dry mass, g/volume, cm3!362.43 (2)10. Inspection and Certification10.1 Inspection and certification of the ma
42、terial shall be asagreed upon by the purchaser and seller as part of the purchasecontract.11. Rejection and Rehearing11.1 Cause for RejectionIf the sample fails to conform toany one of the requirements of this specification, a secondsample from the same lot shall be prepared and tested. Theresults o
43、f the retest shall be averaged with the results of theoriginal test to determine compliance with this specification.11.2 RetestFailure to conform to any one of the require-ments of this specification, upon retest as prescribed above,shall constitute grounds for rejection. In case of rejection, these
44、ller shall have the right to reinspect the rejected shipment andresubmit the lot after removal of the portion of the shipmentnot conforming to the specified requirements, provided this isdone within 20 days after receipt of notice of the specific causefor rejection.12. Packaging and Package Marking1
45、2.1 Commercial UnitsThe commercial unit is one squarefor marketing the Type I shingles products. One square issufficient material to cover 9.29 m2(100 ft2) of wall area whenapplied according to accepted practices. The Type II clap-boards and Type III sheets are usually marketed in units of 92.9m2(10
46、00 ft2).12.2 Commercial PackagingThe semidense mineral fibersiding shall be packaged in accordance with accepted commer-cial practice to assure acceptance by common carrier.12.3 Job ProtectionPackages of the product shall bestacked on supports that will keep it off the ground; level, flat,and shall
47、be covered to provide protection from the weatheruntil used. Inside dry storage is preferable.TABLE 2 Nominal DimensionsTypeWidth Length Thickness (nominal)in. m in. m in. mmI 8 to 16 0.20 to 0.41 24 to 48 0.61 to 1.2238 9.5II 6 to 16 0.15 to 0.41 49 to 144 1.24 to 3.6638 9.5III 48 1.22 48 to 144 1.
48、22 to 3.6638 9.548 1.22 48 to 144 1.22 to 3.6614 6.4TABLE 3 Sampling ScheduleNumber of Shingles, Clapboards,or Sheets in ShipmentNumber of UnitsSelected500 and under 3501 to 1 000 51 001 to 1 728 61 729 to 2 744 72 745 to 4 096 84 097 to 5 832 95 833 to 8 000 108 001 to 64 000 2064 001 to 216 000 30
49、216 001 to 512 000 40512 001 to 1 000 000 50C 725 90 (2003)e13SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply when material is supplied under thisspecification for U.S. Government procurement.S1. PackagingS1.1 Unless otherwise specified in the contract, the materialshall be packaged in accordance with the producers standardpractice which will be acceptable to the carrier at lowest rates.Containers and packing shall comply with Uniform Fr
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