1、Designation: D4477 09An American National StandardStandard Specification forRigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit1This standard is issued under the fixed designation D4477; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last 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 testmethods for the materials, dimensions, camber
3、, impactstrength, expansion, and appearance of extruded single-wallsoffit manufactured from rigid (unplasticized) PVC compound.Methods of indicating compliance with this specification arealso provided.1.2 The use of PVC recycled plastic in this product shall bein accordance with the requirements in
4、Section 4.1.3 Rigid (unplasticized) poly(vinyl chloride) (PVC) sidingis covered in Specification D3679.1.4 Soffit produced to this specification shall be installed inaccordance with Practice D4756. Reference shall also be madeto the manufacturers installation instructions for the specificproduct to
5、be installed.NOTE 1Information with regard to soffit maintenance shall be ob-tained from the manufacturer.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not
6、 considered standard.1.6 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 this standard to establish
7、 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:2D618 Practice for Conditioning Plastics for TestingD635 Test Method for Rate of Burning a
8、nd/or Extent andTime of Burning of Plastics in a Horizontal PositionD696 Test Method for Coefficient of Linear Thermal Ex-pansion of Plastics Between 30C and 30C with aVitreous Silica DilatometerD883 Terminology Relating to PlasticsD1600 Terminology for Abbreviated Terms Relating toPlasticsD2244 Pra
9、ctice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD2457 Test Method for Specular Gloss of Plastic Films andSolid PlasticsD3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)SidingD3892 Practice for Packaging/Packing of PlasticsD4226 Test
10、Methods for Impact Resistance of Rigid Poly-(Vinyl Chloride) (PVC) Building ProductsD4756 Practice for Installation of Rigid Poly(Vinyl Chlo-ride) (PVC) Siding and SoffitD5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled Plastics3D5947 Test Methods for Physical
11、Dimensions of SolidPlastics SpecimensE631 Terminology of Building Constructions3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nologies D883, D1600, and E631, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 vinyl sofft, na shaped material, ma
12、de principallyfrom rigid poly(vinyl chloride) (PVC) that is used to clad theunderside of a roof overhang.3.2.2 DiscussionAny exception to a homogeneous rigidPVC compound is present in a coextruded or laminatedcapstock.4. Materials and Manufacture4.1 The soffit, shall be made of one or more layers of
13、poly(vinyl chloride) (PVC) compound.Any layers of materialsother than poly (vinyl chloride) (PVC) compound shall be keptto less than 20% by volume.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.24 on Plastic Buildin
14、gProducts.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1985. Last previous edition approved in 2008 as D4477 08. DOI:10.1520/D4477-09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For
15、 Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM Internati
16、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Use rigid PVC recycled plastic, as defined in GuideD5033 if all the requirements in the sections on Terminology(Section 3), on Materials and Manufacture (Section 4), and onPhysical Requirements (Section 5)
17、are met by the soffitcontaining PVC recycled plastic.4.3 The poly(vinyl chloride) soffit material, when tested inaccordance with Test Method D635, shall not exceed anaverage extent of burn of 4 in. (100 mm), with an average timeof burn not to exceed 10 s. A minimum sample thickness of0.030 in. (0.8
18、mm) is required.NOTE 3Caution: The flammability testing data, conclusions, andrecommendations of Test Method D635 relate solely to the measurementand description of properties for classification of the poly(vinyl chloride)soffit material in response to flame under controlled laboratory conditionsand
19、 shall not be used for the description or appraisal of the fire hazard ofvinyl soffit under actual fire conditions.4.4 The PVC compound when extruded into soffit shallmaintain uniform color and be free of any visual surface orstructural changes, such as peeling, chipping, cracking, flaking,or pittin
20、g.5. Physical Requirements5.1 Length and WidthThe nominal length and width of thesoffit shall be as agreed upon between the purchaser and theseller. The actual length shall not be less than14 in. (6.4 mm)of the nominal length and the actual width shall be within 618in. (3.2 mm) of the nominal width
21、when measured in accor-dance with 6.3 and 6.4.5.2 ThicknessThe minimum thickness of the soffit shallbe 0.030 in. (0.8 mm) when measured in accordance with 6.5.5.3 CamberA full length of soffit, typically 10 or 12 ft(3.05 or 3.66 m), will not have a camber greater than18 in.(3.2 mm) when measured in
22、accordance with 6.6.5.4 Initial Impact ResistanceThe soffit shall have a mini-mum impact strength of 45 in.lbf (5.34 J) when tested inaccordance with 6.7.5.5 Coeffcient of Linear Expansion The soffit shall havea coefficient of linear expansion not greater than 4.5 by 105in./in./F (8.1 by 105mm/mm/C)
23、 when tested in accordancewith 6.8.5.6 GlossThis requirement is not applicable to surfaceventilated soffit. The gloss of soffit shall be uniform across theexposed face. The average of all readings for a panel deter-mined in 6.9.1.2 shall not differ from the manufacturersspecified gloss value more th
24、an the permitted variation in Table1, and each individual reading shall not vary more than 10points from the average. Gloss shall be tested in accordancewith 6.9.TABLE 1ManufacturersSpecified Gloss ValuePermitted difference fromMfg. Spec. Gloss ValueLess than or equal to 35 68Greater than 35 6105.7
25、Deflection of the soffit shall not exceed 618 in. (3.2mm) when installed flat in a horizontal position over a span of24 in. (610 mm) without intermittent support when tested inaccordance with 6.11.5.8 ColorThe color of the soffit shall be within thedefined color space parameters for the specific col
26、or agreedupon between the purchaser and the manufacturer. The colorspecified shall be uniform on the surface of the soffit panels,except in the case of multi-colored wood grain panels.5.8.1 Uniformity of ColorWhen tested in accordance with6.10, the total color change, E, between a production specime
27、nand the appropriate reference specimen or agreed-upon colorcoordinates shall not vary by more than 1.5, and the chromaticcoordinates shall not change by more than 6Da = 1.0 and6Db = 1.0.6. Test Methods6.1 GeneralThe inspection and test procedures containedin this section are used to determine the c
28、onformance ofproducts to the requirements of this specification. Each pro-ducer who represents its products as conforming to thisspecification shall be permitted to use statistically basedsampling plans that are appropriate for each manufacturingprocess, but shall keep the essential records necessar
29、y todocument, with a high degree of assurance, his claim that all ofthe requirements of this specification have been met. Addi-tional sampling and testing of the product, as agreed uponbetween the purchaser and manufacturer, are not precluded bythis section.6.2 Conditioning and Test Conditions Condi
30、tion the testspecimen in accordance with ProcedureAof Practice D618 andtest under those conditions, unless otherwise specified herein.6.3 LengthLay the specimen on a flat surface and measurewith a steel tape. Measure the length of a soffit panel to thenearest116 in. (1.6 mm) at the center, the butt
31、edge, and thebottom of the top lock. The average of the three measurementsis the actual length.6.4 WidthInterlock two long specimens, each at least 26in. (660 mm) long in the normal mode for installation. Lay thetwo specimens on a flat surface. Measure to the nearest116 in.(1.6 mm), the distance bet
32、ween the lowest butt edge of the topspecimen and the lowest butt edge of the bottom specimen.Commencing approximately 1 in. (25 mm) from one end of thespecimens, make 5 measurements at 6 in. (152 mm) intervals,making sure that the measurement is made perpendicular to thebutt edge. Average the measur
33、ements. The average constitutesthe exposed width of soffit.6.5 ThicknessMake a minimum of five equally spacedmeasurements across the width of the soffit specimen perpen-dicular to the exposed surface with a micrometer similar to thatdescribed in Test Method D5947, Method A or B, with theexception th
34、at the vernier reading shall be to 0.001 in. (0.0254mm). Average the measurements. The average constitutes thethickness of the soffit.6.6 CamberPlace a full length of soffit (typically 10 or 12ft (3.05 or 3.66 m), on a flat surface alongside a straightedge atleast as long as the soffit specimen. Mea
35、sure the maximumspace between the edge of the siding specimen and thestraightedge for each edge to the nearest116 in. (1.6 mm).6.7 Impact ResistanceTest impact resistance of soffit inaccordance with Test Methods D4226, Procedure A impactorhead configuration H.25. 4 in-lb increments (0.5 in heightinc
36、rements with 8 lb falling weight) shall be used. MinimumD4477 092sample dimensions shall be 1.5 in. by 1.5 in. Samples shall betested with the normally exposed surface facing up. Condition-ing time for quality control test shall be at least 1 hr.6.8 Coeffcient of Linear Expansion Conduct this test i
37、naccordance with Test Method D696.6.9 GlossMeasure gloss using a 75 geometry glossmeterthat meets the requirements of the Apparatus section of TestMethod D2457.6.9.1 Procedure:6.9.1.1 Measure gloss on one piece of soffit on at least threewidely separated points across the width of the exposedsurface
38、. At least one reading shall be taken on each face of thepanel. The area to be tested must be flat. If a flat area on theexposed surface cannot be found due to the style or depth ofembossing of the panel being tested, then a non-exposed areaof the panel shall be chosen in its place. Such locations s
39、hall berepresentative of the gloss of the area that will be exposed afterinstallation.6.9.1.2 Each reading shall be within the limits specified in5.6. The average of all readings shall be used to represent thegloss of the sample.6.9.1.3 This test method is not applicable to surface venti-lated soffi
40、t.6.10 Color UniformityCalculate the difference betweenthe LH,aH,bHcolor coordinates for a production specimen tothose of either the appropriate reference specimen or theagreed-upon color coordinates for that specific color product inaccordance with Test Method D2244. Calculate the totaldifference,
41、E, between the production specimen and the refer-ence specimen in accordance with Test Method D2244.6.11 Deflection:6.11.1 Specimen PreparationThree pieces of soffit, 30 in.(762 mm) long, are prepared and conditioned at room tempera-ture for 24 h.6.11.2 ApparatusTwo parallel supporting beams,12 in.(
42、12.7 mm) wide at the same level of elevation and 24 in. (610mm) apart, are set up with the provision of measuring heightdistance at the center of the beams.6.11.3 ProcedureInterlock the three pieces of soffit panelwith ends being in line. Position the soffit unit across thesupport beams so that the
43、ends of the unit are equidistant fromthe outside edges of the beams. The panel center area iscompared in height distance to the height of the support beamsand any deviation is recorded.7. Product Marking7.1 In order for purchasers to identify soffit conforming toall requirements of this specificatio
44、n, 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 PVC Soffit conformsto all the requirements establ
45、ished in ASTM SpecificationD4477, developed cooperatively with the industry and pub-lished by the American Society for Testing and Materials.Full responsibility for the conformance of this product to thespecification is assumed by (name and address of producer ordistributor).”7.2 The following abbre
46、viated statement is suggested whenavailable space on labels is insufficient for the full statement:“Conforms to ASTM Specification D4477, (name and addressof producer or distributor).”8. Packing, Packaging, and Package Marking8.1 The soffit shall be packaged in such a manner as toprovide reasonable
47、protection against damage in ordinaryhandling, transportation, and storage.8.2 The provisions of Practice D3892 shall apply to thisspecification.9. Keywords9.1 plastic building products; plastic weatherability; re-cycled plastics; rigid PVC soffit; weatherability color-holdguidelinesSUMMARY OF CHANG
48、ESCommittee D20 has identified the location of selected changes to this standard since the last issue (D4477 - 08)that may impact the use of this standard. (November 1, 2009)(1) Modified subections 5.6 and 6.9 to clarify the methods ofdetermining acceptable variation in gloss.Committee D20 has ident
49、ified the location of selected changes to this standard since the last issue (D4477-04a)that may impact the use of this standard.(1) 6.4 was revised.D4477 093ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard 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
