1、Designation: D7254 15D7254 17 An American National StandardStandard Specification forPolypropylene (PP) Siding1This standard is issued under the fixed designation D7254; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification establishes requirements and test methods for materials, impact strength, appearance, surface flame
3、spread, and windload wind load resistance of siding products manufactured from polypropylene material. Methods of indicatingcompliance with this specification are also provided.1.2 The use of polypropylene recycled plastic in this product shall be in accordance with the requirements in Section 4.1.3
4、 Siding produced to this specification shall be installed in accordance with manufacturers installation instructions for thespecific product to be installed.NOTE 1Information with regard to siding maintenance shall be obtained from the manufacturer.1.4 The values stated in inch-pound units are to be
5、 regarded as the standard. The SI units given in parentheses are forinformation purposes only.1.5 The following precautionary caveat pertains to the test method portion only, Section 6 of this specification: This standarddoes not purport to address all of the safety concerns, if any, associated with
6、 its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.NOTE 2There is no known ISO equivalent to this standard.1.6 This international standard was developed in accordan
7、ce with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Stand
8、ards:2D883 Terminology Relating to PlasticsD1435 Practice for Outdoor Weathering of PlasticsD1600 Terminology for Abbreviated Terms Relating to PlasticsD3679 Specification for Rigid Poly(Vinyl Chloride) (PVC) SidingD3892 Practice for Packaging/Packing of PlasticsD4101 Specification for Polypropylene
9、 Injection and Extrusion MaterialsD4226 Test Methods for Impact Resistance of Rigid Poly(Vinyl Chloride) (PVC) Building ProductsD5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics (Withdrawn 2007)3D5206 Test Method for Windload Resistance of Rigid Plastic
10、 SidingE84 Test Method for Surface Burning Characteristics of Building MaterialsE631 Terminology of Building ConstructionsG147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests2.2 ASCE Standard:4ASCE 7-027-10 Minimum Design Loads for Building
11、s and Other Structures1 This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.24 on Plastic Building Products.Current edition approved April 1, 2015June 1, 2017. Published April 2015July 2017. Originally approved in 2007.
12、Last previous edition approved in 20072015 asD7254 07.D7254 15. DOI:10.1520/D7254-15.DOI:10.1520/D7254-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standar
13、ds Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from American Society of Civil Engineers (ASCE), 1801 Alexander Bell Dr., Reston, VA 20191.This document is not an ASTM standard and is intended only to prov
14、ide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the
15、standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12.3 International Code Council:5International Bui
16、lding CodeInternational Residential Code2.4 Vinyl Siding Institute, Inc.6VSI Vinyl Siding Installation Manual (2015)2.5 Structural Building Components Association:7ANSI/SBCA FS 100-2012 Standard Requirements for Wind Pressure Resistance of Foam Plastic Insulating Sheathing Used inExterior Wall Cover
17、ing Assemblies3. Terminology3.1 Definitions are in accordance with Terminologies D883, D1600, and E631, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 polypropylene sidinga shaped material, made principally from polypropylene homopolymer, or copolymer, which inso
18、me cases may contain fillers and/or reinforcements, that is used to clad exterior walls of buildings.3.2.2 self-supporting specimena specimen that remains in place by its own structural characteristics both before and duringthe fire test.3.2.3 wind load design pressure ratingthe maximum wind pressur
19、e that a polypropylene siding product is rated to withstand,based on testing under Test Method D5206.3.2.4 standard wind load design pressure ratingthe wind load design pressure rating for a siding product when installed 1)over a sheathing material designed and attached such that it is capable of re
20、sisting 100% of positive and negative wind pressuresoccurring under design conditions at the building location; and 2) with the standard fastening method specified in building codes,general installation instructions, and the siding manufacturers instructions.3.2.5 alternative wind load design pressu
21、re ratingthe wind load design pressure rating for a siding product when installedover a sheathing not designed and attached such that it is capable of resisting 100 % of positive and negative wind pressuresoccurring under design conditions at the building location, or when the siding is not fastened
22、 in the standard way; as specified bythe manufacturer3.2.5.1 DiscussionThe standard test conditions, configuration, and fastening method used in this Specification are specified in 6.4, while alternativesheathing and installation conditions are specified by the manufacturer and must be reflected in
23、the products installationinstructions. Alternative ratings apply only when the specified sheathing and fastening conditions are used. See Annex A1 forinformation on differences between the standard wind load design pressure rating and alternative wind load design pressure ratings,and how to determin
24、e standard and alternative design pressure ratings.3.2.6 temperate northern climatein weather testing, a NorthAmerican metropolitan area testing site located within 73 to 100W longitude and 37 to 45 N latitude.4. Materials and Manufacture4.1 The siding shall be made principally of polypropylene comp
25、ound, prepared from polypropylene homopolymer orcopolymer.4.2 Where polypropylene recycled plastic as defined in Guide D5033 is used, the siding containing the polypropylene recycledplastic shall meet all the requirements in the sections on Terminology (Section 3), on Materials and Manufacture (Sect
26、ion 4), andon Physical Requirements (Section 5).4.3 The polypropylene compound shall be compounded so as to provide the heat stability and weather exposure stabilityrequired for the siding market application.5. Physical Requirements5.1 ColorThe color of the siding shall be within the defined color p
27、arameters for the specific color agreed upon between thepurchaser and the seller.5.2 Impact ResistanceSiding shall have a minimum impact strength of 35 in-lbfin.-lbf when tested in accordance with 6.2.5.3 WeatheringThe siding shall be free of any visual surface or structural changes such as peeling,
28、 chipping, cracking, flaking,or pitting when tested in accordance with 6.3.5 Available from International Code Council (ICC), 500 New Jersey Ave., NW, 6th Floor, Washington, DC 20001, http:/www.iccsafe.org.6 National Housing Center, 1201 15th Street NW, Suite 220, Washington, DC 20005, http:/www.vin
29、ylsiding.org7 6300 Enterprise Lane, Madison, WI 53719, http:/D7254 1725.4 Windload Wind Load ResistanceThe siding panel(s) shall be able to shall withstand a minimum static test pressure of15.73 lbf/ftand a standard2 (753 Pa) when tested in accordance with wind load design pressure rating shall 6.4.
30、be determined.5.4.1 Minimum Test PressureThe static pressure of 15.73siding panel(s) shall be able to withstand a minimum static testpressure of 16.2 lbf/ft2 (753 Pa) was established to withstand structural loading conditions that occur in 110 mph (776 Pa) whentested in accordance with 6.4(177 km/h)
31、 wind-zone areas for elevations of 30 ft (9.1 m) and less in exposure. The averagemaximum sustained static pressure determined in 6.4 category B, and is equivalent to 29.12 lbf/ftshall be equal to or greater2 (1394Pa) design pressure. than this value.NOTE 3The static pressure of 16.2 lbf/ft2 (776 Pa
32、) was established to withstand structural loading conditions that occur in wind exposures ofapproximately 110 mph (177 km/h) (VASD) for mean roof heights of 30 ft (9.1 m) and less in exposure category B, and corresponds to 30.0 lbf/ft2 (1436Pa) design pressure, to match the default wind design condi
33、tions of Table R703.3(1) in the 2015 International Residential Code.NOTE 4Refer to AnnexA1 for an explanation as to how the negative design pressure was established, and for applications where the effective negativedesign pressure as specified in ASCE 7-10 is different from 30.0 lbf/ft2 (1436 Pa) (f
34、or example, wind-zone areas greater than about 110 mph (177 km/h)(VASD) (225 km/h (VULT) or mean roof height above 30 ft (9.1 m), or exposures other than exposure category B).5.4.1.1 The design-pressure values can be negative (suction loads) or positive. The negative values are the largest in magnit
35、udeand are the values used for this specification.5.4.1.2 Refer to Annex A1 for an explanation of how the negative design pressure was established and for applications wherethe effective negative design pressure as specified in ASCE 7-02 is greater than 29.12 lbf/ft2 (1394 Pa) (for example, wind-zon
36、eareas greater than 110 mph (177 km/h) or elevations above 30 ft (9.1 m), or exposures other than exposure category B)5.4.2 Standard Wind Load Design Pressure RatingThe standard wind load design pressure rating shall be determined fromthe results of testing in accordance with 6.4, using the procedur
37、es described in Annex A1, section A1.3.NOTE 5The standard design pressure rating is valid for applications where the siding is installed over sheathing and its fastening that are capableof independently resisting both positive and negative wind pressures occurring under design conditions at the buil
38、ding location. For applications overother sheathing, a different design pressure rating is applicable, and is determined in accordance with Annex A1, section A1.3. Determination of a ratingother than the standard design pressure rating is not required by this section.5.4.3 Alternative Design Pressur
39、e RatingsDesign pressure ratings other than the standard wind load design pressure rating,for use with different sheathing materials or using different installation or fastening, are permitted to be determined in accordancewith testing under 6.4, using the procedures in Annex A1.5.5 Surface Flame Sp
40、readThe siding shall exhibit a flame spread index not exceeding 200 when tested in accordance with 6.5.6. Test Methods6.1 GeneralThe inspection and test procedures contained in this section are used to determine the conformance of productsto the requirements of this specification.NOTE 6Each producer
41、 who represents its products as conforming to this specification typically uses statistically based sampling plans that areappropriate for each manufacturing process to verify ongoing compliance. Specifications for quality control programs are beyond the scope of thisstandard specification. Addition
42、al sampling and testing of the product, as agreed upon between the purchaser and the manufacturer, are not precluded bythis section.6.2 Impact Resistance:6.2.1 Conditioning and Test ConditionsCondition the test specimen in accordance with Specification D4101 and test underthose conditions unless oth
43、erwise specified herein. Conditioning time for tests shall be at least 4 hours.6.2.2 Impact TestTest impact resistance of siding in accordance with Test Method D4226, Procedure A, impactor headconfiguration H.25. Increments of 4 in.-lb (for example, 0.5 in. height increments with an 8 lb falling wei
44、ght) shall be used.Minimum sample dimensions shall be 1.5 by 1.5 inch. Samples shall be tested with the normally exposed surface facing up.6.3 WeatherabilityExpose test specimens with a plywood backing at an angle of 45 South in the northern hemisphere inaccordance with Practices D1435 and G147 for
45、two years in at least three widely different climatic areas. Test sites shall be locatedin a hot, dry climate, such as Phoenix, AZ; a hot, humid climate such as Miami, FL; and a temperate, northern climate such asCleveland, OH or Louisville, KY.6.3.1 Specimens shall be a minimum of 2 by 334 in. (51
46、by 95 mm).6.3.2 Samples shall be representative of the product to be evaluated. Samples shall be taken either from commercial productsor from laboratory samples. Laboratory samples shall be produced in the same manner as the commercial products to be evaluated.NOTE 7Production of laboratory samples
47、in the same manner includes use of the same method of forming the product. For example, if the commercialproduct is extruded, the laboratory specimen shall be extruded; if the commercial product is injection molded, the laboratory specimen shall be injectionmolded, and so forth.6.4 Windload Wind Loa
48、d ResistanceConduct the test on windload wind load resistance of the finished siding in accordancewith Test Method D5206. The average maximum sustained static test pressure determined from this testing is used in 5.4. Forpurposes of determining compliance with the minimum test pressure and standard
49、design pressure requirements in 5.4, the teststructure shall be constructed with vertical studs 16 inches on center, the siding in the test installation shall be installed over woodsheathing with a nominal thickness of 716 to 12 in., and fastened as follows:D7254 1736.4.1 Fastener TypeRoofing nail, smooth shank. Unless greater dimensions are specified in the manufacturers instructions,0.120 in. (18 in. nominal; 3.2 mm) shank diameter, 516 in. (7.9 mm) head diameter, length as necessary to penetrate the thicknessof
