1、Designation: C 725 90 (Reapproved 2008)Standard 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. A
2、 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 Department of Defense.1. Scope1.1 This specification covers semidense mineral fiber sid
3、ing(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
4、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
5、. 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 addres
6、s 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 Documen
7、ts2.1 ASTM Standards:3C 460 Terminology for Asbestos-Cement4D 1037 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.
8、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.)
9、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 a
10、re 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 Semidens
11、e 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 th
12、e 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 byloadi
13、ng 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 Produc
14、ts and Accessories.Current edition approved May 1, 2008. Published July 2008. Originally approvedin 1972. Last previous edition approved in 2003 as C 725 90(2003)1.2Available from The Asbestos Institute, http:/ referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer
15、Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Withdrawn.5Available from Standardization Documents, Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright
16、ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 accelerate
17、d 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 corre-sponding values obtained from tests made
18、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 Variations6.1 Siding covered by this specification sh
19、all 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.) for nominal14-in.thick product as measured
20、 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. Workmanship, Finish, and Appearance7.1 Workmanship
21、The 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 surface may beuncoated, factory primed, or pr
22、efinished, 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 specified,clapboards shall be supplied without
23、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. Nails8.1 Nail MaterialsAll nails shall be of nonst
24、aining,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 units securely toa nailing base.8.3 Type I
25、I 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 is omitted.9. Sampling and Test Procedures
26、9.1 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 Flexural Strength and Deflection Tests:9.2.1 Prepa
27、ration 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 II and III. For TypeI, cut one half of the
28、 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.)specimen to constant mass in a ventilated o
29、ven 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 con-straint rocker-type bearing edges, roller
30、s, 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 supportsshall be parallel. Mount a dial micrometer
31、 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 thespecimen in approximately 1 min. The error i
32、n 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, prepare a setof specimens 305 by 305 mm (12
33、 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.9.3.2 Thickness Measurement for Swelling TestMeasu
34、rethe thickness of each test specimen 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,TABLE 1 Physical RequirementsNominalThicknessFlexuralStrengthDeflectionin. mm lbf N in. mmType I38 9.5 40 178 0.10
35、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 (2008)2textured, or weather-exposed surface of the specimen. Using amicrometer caliper reading to 0.03 mm (0.001 in.), measure theoverall thickness of metal plate and specimen at the approxi-mate midpoin
36、t 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 specimens that are prepared inaccordance with 10.3.
37、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, remeasure the thicknessat the same locations on
38、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 to accelerated aging cycles in accordancewith
39、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 the dry specimens that have been usedin the fle
40、xural 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 0.5 %. Report the density as the averagevalue
41、 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 material shall be asagreed upon by the purchaser
42、 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 of the retest shall be averaged with the result
43、s 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, theseller shall have the right to reinspect the rej
44、ected 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 Marking12.1 Commercial UnitsThe commercial unit is one
45、 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(1000 ft2).12.2 Commercial PackagingThe semidense
46、 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 be covered to provide protection from the weat
47、heruntil 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 6to16 0.15to0.41 49to144 1.24to3.6638 9.5III 48 1.22 48 to 144 1.22 to 3.6638 9.548 1.22 48 to 144 1.22 to 3.6614 6.4TA
48、BLE 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 30216 001 to 512 000 40512 001 to 1 000 000 50C 725 90 (
49、2008)3SUPPLEMENTARY 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 FreightClassification Rules6or National Motor Freight Cla
