1、Designation: D7254 07D7254 15 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 Scope*1.1 This specification establishes requirements and test methods for materials, impact strength, appearance, surface
3、 flamespread, and windload resistance of siding products manufactured from polypropylene material. Methods of indicating compliancewith 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 Sid
4、ing 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 reg
5、arded 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 its
6、 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.2. Referenced Documents2.1 ASTM Standards:2D883 Terminology R
7、elating 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 Injection and Extrusion
8、 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Building ProductsD5033 Guide for Development of ASTM Standards Relating to Recycling and Use of Recycled Plastics (Withdrawn 2007)3D5206 Test Method for Windload Resistance of Rigid Plastic SidingE84 Test Method f
9、or 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:ASCE 7-02 Minimum Design Loads for Buildings and Other Structures43. Ter
10、minology3.1 Definitions are in accordance with Terminologies D883, D1600, and E631, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:1 This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.24 o
11、n Plastic Building Products.Current edition approved Jan. 1, 2007April 1, 2015. Published January 2007April 2015. DOI: 10.1520/D7254-07.Originally approved in 2007. Last previous editionapproved in 2007 as D7254 07. DOI:10.1520/D7254-15.2 For referencedASTM standards, visit theASTM website, www.astm
12、.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards 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 C
13、ivil Engineers (ASCE), 1801 Alexander Bell Dr., Reston, VA 20191.This document is not an ASTM standard and is intended only to provide 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
14、 changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the 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, 10
15、0 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 polypropylene sidinga shaped material, made principally from polypropylene homopolymer, or copolymer, which insome cases may contain fillers and/or reinforcements, that is used to clad exterior walls of buildings
16、.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 temperate northern climatein weather testing, a NorthAmerican metropolitan area testing site located within 73 to 100W longitude and 37 to 45 N latitude.4.
17、Materials and Manufacture4.1 The siding shall be made principally of polypropylene compound, 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 requ
18、irements in the sections on Terminology (Section 3), on Materials and Manufacture (Section 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. Ph
19、ysical Requirements5.1 ColorThe color of the siding shall be within the defined color parameters for the specific color agreed upon between thepurchaser and the seller.5.2 Impact ResistanceSiding shall have a minimum impact strength of 35 in-lbf when tested in accordance with 6.2.5.3 WeatheringThe s
20、iding shall be free of any visual surface or structural changes such as peeling, chipping, cracking, flaking,or pitting when tested in accordance with 6.3.5.4 Windload ResistanceThe siding panel(s) shall be able to withstand a minimum static test pressure of 15.73 lbf/ft2 (753 Pa)when tested in acco
21、rdance with 6.4.5.4.1 The static pressure of 15.73 lbf/ft2 (753 Pa) was established to withstand structural loading conditions that occur in 110mph (177 km/h) wind-zone areas for elevations of 30 ft (9.1 m) and less in exposure category B, and is equivalent to 29.12lbf/ft2 (1394 Pa) design pressure.
22、5.4.1.1 The design-pressure values can be negative (suction loads) or positive. The negative values are the largest in magnitudeand 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 whereth
23、e effective negative design pressure as specified in ASCE 7-02 is greater than 29.12 lbf/ft2 (1394 Pa) (for example, wind-zoneareas greater than 110 mph (177 km/h) or elevations above 30 ft (9.1 m), or exposures other than exposure category B)5.5 Surface Flame SpreadThe siding shall exhibit a flame
24、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. Statistically-based sampling plans appropriate for each
25、 manufacturing process are anacceptable means of demonstrating conformance with this specification. Each producer shall keep the essential records necessaryto document, with a high degree of assurance, the claim that all of the requirements of this specification have been met.This sectiondoes not pr
26、eclude additional sampling and testing of the product, if such sampling and testing is agreed upon between the purchaserand manufacturer.NOTE 3Each producer who represents its products as conforming to this specification typically uses statistically based sampling plans that areappropriate for each
27、manufacturing process to verify ongoing compliance. Specifications for quality control programs are beyond the scope of thisstandard specification. Additional sampling and testing of the product, as agreed upon between the purchaser and the manufacturer, are not precluded bythis section.6.2 Impact R
28、esistance:6.2.1 Conditioning and Test ConditionsCondition the test specimen in accordance with Specification D4101 and test underthose 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 accordance w
29、ith 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 weight) 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 W
30、eatherabilityExpose test specimens with a plywood backing at an angle of 45 South in the northern hemisphere inaccordance with Practices D1435 and G147 for two years in at least three widely different climatic areas. A Test sites shall belocated in a hot, dry climate, such as Phoenix, AZ; a hot, hum
31、id climate such as Miami, FL; and a temperate, northern climate aresuggested sites.such as Cleveland, OH or Louisville, KY.D7254 1526.3.1 Specimens shall be a minimum of 2 by 334 in. (51 by 95 mm).6.3.2 Samples shall be representative of the product to be evaluated. Samples shall be taken either fro
32、m commercial productsor from laboratory samples. Laboratory samples shall be produced in the same manner as the commercial products to be evaluated.NOTE 4Production of laboratory samples in the same manner includes use of the same method of forming the product. For example, if the commercialproduct
33、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 ResistanceConduct the test on windload resistance of the finished siding in accordance with Test MethodD5206.6.5 Surface
34、Flame SpreadConduct the test on surface flame spread characteristics in accordance with Test Method E84. Thetest specimen shall either be self-supporting by its own structural characteristics or held in place by added supports along the testspecimen surface.7. Product Marking7.1 In order for purchas
35、ers to identify siding conforming to all requirements of this specification, producers and distributorsshall include a statement of compliance in conjunction with their name and address on product labels, invoices, sales literature,and the like. The following statement is suggested when sufficient s
36、pace is available: This PP siding conforms to all therequirements established inASTM Specification D 7254-XX, developed cooperatively with the industry and published byASTM.Full responsibility for the conformance of this product to the specification is assumed by (name and address of producer ordist
37、ributor).7.2 The following abbreviated statement is suggested when available space on labels is insufficient for the full statement:Conforms to ASTM Specification D 7254-XX (name and address of producer or distributor).7. Packing, Packaging, Packaging and Package Marking7.1 The siding shall be packe
38、d in such a manner as to provide reasonable protection against damage in ordinary handling,transportation, and storage.7.2 Provisions of Practice D3892 shall apply to this specification.7.3 To aid identification of polypropylene siding conforming to all requirements of this specification, producers
39、and distributorsshall include a statement of compliance in conjunction with their name and address on product labels, invoices, sales literature,and the like. Use the following statement, or equivalent, when sufficient space is available: “This polypropylene siding conformsto all the requirements es
40、tablished in ASTM Specification D7254 developed cooperatively with the industry and published byASTM. Full responsibility for the conformance of this product to the specification is assumed by (name and address of produceror distributor).”7.4 Use the following abbreviated statement, or equivalent, w
41、hen available space on labels is insufficient for the full statement:“Conforms to ASTM Specification D7254-XX (name and address of producer or distributor).”8. Keywords8.1 plastic building products; polypropylene siding; specificationANNEX(Mandatory Information)A1. WINDLOAD RESISTANCE TEST DESIGN FA
42、CTORSA1.1 Windload Criteria:A1.1.1 ASCE 7-02 is the basis for determining the design pressures used in this test method. The velocity pressures, q, used inthis test method have been computed using the following equation:q 50.00256 KzKdV2I lb/ft2!50.613 KzKdV2I N/m2! (A1.1)where:V = wind velocity, mp
43、h (km/h). The basic wind speed corresponds to a 3-s gust speed at 33 ft (10.1 m) above ground inexposure category C, as described in ASCE 7-02. A velocity of 110 mph (177 km/h) was used in this specification. (SeeNote A1.1.)D7254 153I = “importance factor” as described in ASCE 7-02. A value of 1.0 w
44、as used.Kz = “velocity pressure coefficient” as described in ASCE 7-02. A “Kz” of 0.70 was used in the wind pressure calculations,which is the value from ASCE 7-02 for an elevation of 30 ft (9.1 m) above ground level and Exposure Category B.Kd = “wind directionality factor” as described in ASCE 702.
45、 A “Kd” of 0.85 is used.A1.1.1.1 The velocity pressure = 18.43 lbf/ft2 (882 Pa).NOTE A1.1InASCE 7-02 the default wind speeds are given for exposure category C, and a table is provided to adjust this wind speed for other exposurecategories. Since most siding is installed on buildings located in expos
46、ure category B, the velocity pressure coefficient, Kz is included in the equation tomake this adjustment.A1.1.2 ASCE 7-02 recommends various internal and external pressure coefficients, which include gust response factors. Thesecoefficients vary with the effective area of the cladding component, the
47、 location of the cladding component relative to buildingcorners, and the configuration of the building (open versus enclosed). The internal and external pressure coefficients are taken fromFigure 65 and Figure 611A of ASCE 7-02. The effective area is taken as 10 ft2 (the area of one piece of siding)
48、, an enclosedbuilding is assumed, and factors for the building corners are used.A1.1.2.1 The pressure coefficients are as follows:Internal Pressure Coefficient = 0.18External Pressure Coefficient = +1.00 and 1.40A1.1.2.2 The design pressure is calculated by multiplying the velocity pressures by the
49、algebraic sum of the internal and externalpressure 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 in magnitude and are the design values used in this test method. Basedon research conducted by Architectural Testing, Inc. for the Vinyl Siding Institute,5 a certain amount of pressure equalizationoccurs through residential siding products installed with sheathing under high dynamic pres
