1、Designation: D 7254 07Standard Specification forPolypropylene (PP) Siding1This standard is issued under the fixed designation D 7254; 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 parenthese
2、s indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification establishes requirements and testmethods for materials, impact strength, appearance, surfaceflame spread, and windload resistance of si
3、ding productsmanufactured from polypropylene material. Methods of indi-cating compliance with this specification are also provided.1.2 The use of polypropylene recycled plastic in this prod-uct shall be in accordance with the requirements in Section 4.1.3 Siding produced to this specification shall
4、be installed inaccordance with manufacturers installation instructions for thespecific product to be installed.NOTE 1Information with regard to siding maintenance shall beobtained from the manufacturer.1.4 The values stated in inch-pound units are to be regardedas the standard. The SI units given in
5、 parentheses are forinformation purposes only.1.5 The following precautionary caveat pertains to the testmethod portion only, Section 6 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 t
6、his standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.NOTE 2There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D 883 Terminology Relating to PlasticsD 1435 Practice for Outdoo
7、r Weathering of PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)SidingD 3892 Practice for Packaging/Packing of PlasticsD 4101 Specification for Polypropylene Injection and Ex-trusion MaterialsD 4226 Test Methods for Impact
8、Resistance of Rigid Poly-(Vinyl Chloride) (PVC) Building ProductsD 5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled PlasticsD 5206 Test Method for Windload Resistance of RigidPlastic SidingE84 Test Method for Surface Burning Characteristics ofBuilding Materials
9、E 631 Terminology of Building ConstructionsG 147 Practice for Conditioning and Handling of Nonme-tallic Materials for Natural and Artificial Weathering Tests2.2 ASCE Standard:ASCE 7-02 Minimum Design Loads for Buildings andOther Structures33. Terminology3.1 Definitions are in accordance with Termino
10、logiesD 883, D 1600, and E 631, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 polypropylene sidinga shaped material, made prin-cipally from polypropylene homopolymer, or copolymer,which in some cases may contain fillers and/or reinforcements,that is used to clad
11、 exterior walls of buildings.3.2.2 self-supporting specimena specimen that remains inplace by its own structural characteristics both before andduring the fire test.3.2.3 temperate northern climatein weather testing,aNorth American metropolitan area testing site located within73 to 100 W longitude a
12、nd 37 to 45 N latitude.4. Materials and Manufacture4.1 The siding shall be made principally of polypropylenecompound, prepared from polypropylene homopolymer orcopolymer.4.2 Where polypropylene recycled plastic as defined inGuide D 5033 is used, the siding containing the polypropylenerecycled plasti
13、c shall meet all the requirements in the sections1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.24 on Plastic BuildingProducts.Current edition approved Jan. 1, 2007. Published January 2007.2For referenced ASTM stand
14、ards, 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.3Available from American Society of Civil Engineers (ASCE), 1801 AlexanderBell Dr., Res
15、ton, VA 20191.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.on Terminology (Section 3), on Materials and Manufacture(Section 4), and on Physical Requirements (Section 5).4.3 The polypropylene compound shall be compounded soas to pr
16、ovide the heat stability and weather exposure stabilityrequired for the siding market application.5. Physical Requirements5.1 ColorThe color of the siding shall be within thedefined color parameters for the specific color agreed uponbetween the purchaser and the seller.5.2 Impact ResistanceSiding sh
17、all have a minimum im-pact strength of 35 in-lbf when tested in accordance with 6.2.5.3 WeatheringThe siding shall be free of any visualsurface or structural changes such as peeling, chipping, crack-ing, flaking, or pitting when tested in accordance with 6.3.5.4 Windload ResistanceThe siding panel(s
18、) shall be ableto withstand a minimum static test pressure of 15.73 lbf/ft2(753 Pa) when tested in accordance with 6.4.5.4.1 The static pressure of 15.73 lbf/ft2(753 Pa) wasestablished to withstand structural loading conditions thatoccur in 110 mph (177 km/h) wind-zone areas for elevations of30 ft (
19、9.1 m) and less in exposure category B, and is equivalentto 29.12 lbf/ft2(1394 Pa) design pressure.5.4.1.1 The design-pressure values can be negative (suctionloads) or positive. The negative values are the largest inmagnitude and are the values used for this specification.5.4.1.2 Refer to Annex A1 f
20、or an explanation of how thenegative design pressure was established and for applicationswhere the effective negative design pressure as specified inASCE 7-02 is greater than 29.12 lbf/ft2(1394 Pa) (for ex-ample, wind-zone areas greater than 110 mph (177 km/h) orelevations above 30 ft (9.1 m), or ex
21、posures other thanexposure category B)5.5 Surface Flame SpreadThe siding shall exhibit a flamespread index not exceeding 200 when tested in accordance with6.5.6. Test Methods6.1 GeneralThe inspection and test procedures containedin this section are used to determine the conformance ofproducts to the
22、 requirements of this specification. Statistically-based sampling plans appropriate for each manufacturingprocess are an acceptable means of demonstrating conform-ance with this specification. Each producer shall keep theessential records necessary to document, with a high degree ofassurance, the cl
23、aim that all of the requirements of thisspecification have been met. This section does not precludeadditional sampling and testing of the product, if such sam-pling and testing is agreed upon between the purchaser andmanufacturer.6.2 Impact Resistance:6.2.1 Conditioning and Test ConditionsCondition
24、the testspecimen in accordance with Specification D 4101 and testunder those conditions unless otherwise specified herein.Conditioning time for tests shall be at least 4 hours.6.2.2 Impact TestTest impact resistance of siding in ac-cordance with Test Method D 4226, Procedure A, impactorhead configur
25、ation H.25.6.3 WeatherabilityExpose test specimens with a plywoodbacking at an angle of 45 South in the northern hemisphere inaccordance with Practices D 1435 and G 147 for two years inat least three widely different climatic areas.Ahot, dry climate,such as Phoenix, AZ; a hot, humid climate such as
26、Miami, FL;and a temperate, northern climate are suggested sites.6.3.1 Specimens shall be a minimum of 2 by 334 in. (51 by95 mm).6.4 Windload ResistanceConduct the test on windloadresistance of the finished siding in accordance with TestMethod D 5206.6.5 Surface Flame SpreadConduct the test on surfac
27、eflame spread characteristics in accordance with Test MethodE84. The test specimen shall either be self-supporting by itsown structural characteristics or held in place by addedsupports along the test specimen surface.7. Product Marking7.1 In order for purchasers to identify siding conforming toall
28、requirements of this specification, producers and distribu-tors shall include a statement of compliance in conjunctionwith their name and address on product labels, invoices, salesliterature, and the like. The following statement is suggestedwhen sufficient space is available: This PP siding conform
29、s toall the requirements established in ASTM SpecificationD 7254-XX, developed cooperatively with the industry andpublished byASTM. Full responsibility for the conformance ofthis product to the specification is assumed by (name andaddress of producer or distributor).7.2 The following abbreviated sta
30、tement is suggested whenavailable space on labels is insufficient for the full statement:Conforms to ASTM Specification D 7254-XX (name andaddress of producer or distributor).8. Packing, Packaging, and Package Marking8.1 The siding shall be packed in such a manner as toprovide reasonable protection
31、against damage in ordinaryhandling, transportation, and storage.8.2 Provisions of Practice D 3892 shall apply to this speci-fication.9. Keywords9.1 plastic building products; polypropylene siding;specificationD7254072ANNEX(Mandatory Information)A1. WINDLOAD RESISTANCE TEST DESIGN FACTORSA1.1 Windloa
32、d Criteria:A1.1.1 ASCE 7-02 is the basis for determining the designpressures used in this test method. The velocity pressures, q,used in this test method have been computed using thefollowing equation:q 5 0.00256 KzKdV2I lb/ft2! 5 0.613 KzKdV2I N/m2! (A1.1)where:V = wind velocity, mph (km/h). The ba
33、sic wind speedcorresponds to a 3-s gust speed at 33 ft (10.1 m)above ground in exposure category C, as described inASCE 7-02. A velocity of 110 mph (177 km/h) wasused in this specification. (See Note A1.1.)I = “importance factor” as described in ASCE 7-02.Avalue of 1.0 was used.Kz= “velocity pressur
34、e coefficient” as described inASCE 7-02.A“Kz” of 0.70 was used in the windpressure calculations, which is the value fromASCE 7-02 for an elevation of 30 ft (9.1 m) aboveground level and Exposure Category B.Kd= “wind directionality factor” as described in ASCE702. A “Kd” of 0.85 is used.A1.1.1.1 The
35、velocity pressure = 18.43 lbf/ft2(882 Pa).NOTE A1.1In ASCE 7-02 the default wind speeds are given forexposure category C, and a table is provided to adjust this wind speed forother exposure categories. Since most siding is installed on buildingslocated in exposure category B, the velocity pressure c
36、oefficient, Kzisincluded in the equation to make this adjustment.A1.1.2 ASCE 7-02 recommends various internal and exter-nal pressure coefficients, which include gust response factors.These coefficients vary with the effective area of the claddingcomponent, the location of the cladding component rela
37、tive tobuilding corners, and the configuration of the building (openversus enclosed). The internal and external pressure coeffi-cients are taken from Figure 65 and Figure 611A ofASCE 7-02. The effective area is taken as 10 ft2(the area ofone piece of siding), an enclosed building is assumed, andfact
38、ors for the building corners are used.A1.1.2.1 The pressure coefficients are as follows:Internal Pressure Coefficient = 6 0.18External Pressure Coefficient = +1.00 and 1.40A1.1.2.2 The design pressure is calculated by multiplyingthe velocity pressures by the algebraic sum of the internal andexternal
39、 pressure coefficients.A1.2 Design Pressure:Positive Design Pressure = (18.43)(1.00 + 0.18) = 21.74 psfNegative Design Pressure = (18.43)(1.40 0.18) = 29.12 psfA1.2.1 The negative values (suction loads) are the largest inmagnitude and are the design values used in this test method.Based on research
40、conducted by Architectural Testing, Inc. forthe Vinyl Siding Institute,4a certain amount of pressureequalization occurs through residential siding products in-stalled with sheathing under high dynamic pressures. In light ofthis pressure equalization, the design pressure in theASCE 7-02 windload stan
41、dards is reduced by a factor of 0.36.A1.2.2 Therefore, the required test pressures are calculatedas follows:Pt5 DP3 0.36 3 1.5 (A1.2)where:Pt= test pressure, lbf/ft2(Pa),PP= design pressure, lbf/ft2(Pa),0.36 = pressure equalization factor, and1.5 = safety factor.A1.2.3 In a 110 mph (177 km/h) wind z
42、one area specifyinga design pressure of 29.12 lbf/ft2(1394 Pa) for a building 30ft (9.1 m) in height or less, the required siding uniform load testpressure is 15.73 lbf/ft2(753 Pa). For applications where theeffective design pressure is greater than 29.12 lbf/ft2(1394Pa) (for example, wind zone area
43、s greater than 110 mph (177km/h), elevations over 30 ft (9.1 m), or exposure conditionsother than Exposure B), refer to ASCE 7-02 for the effectivedesign pressure. The product shall be subjected to a static testpressure determined by the formula in A1.2.2. These loadingconditions apply only to sidin
44、g installed to solid walls, withinternal or external sheathing. For applications where thesiding is installed over open studding, rapid pressure equaliza-tion does not occur. In these applications, the load the sidingwill see is equal to the total design pressure. The static testpressure required fo
45、r products used under these conditions is asfollows:Pt5 1.5 3 DP (A1.3)where:Pt= static test pressure, lbf/ft2(Pa),DP = design pressure, lbf/ft2(Pa), and1.5 = safety factor.A1.3 Wind Design Pressures:A1.3.1 The wind velocity maps in ASCE 7-02 provide onesource of design wind pressures for particular
46、 geographicregions.4Vinyl Siding Pressure Equalization Factor, Architectural Testing, Inc., ReportNo. 01-40776.01, September, 2002.D7254073ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this s
47、tandard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years
48、andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee
49、, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org
