1、Designation: D 4477 08An American National StandardStandard Specification forRigid (Unplasticized) Poly(Vinyl Chloride) (PVC) Soffit1This standard is issued under the fixed designation D 4477; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、revision, 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, camb
3、er, 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 i
4、n Section 4.1.3 Rigid (unplasticized) poly(vinyl chloride) (PVC) sidingis covered in Specification D 3679.1.4 Soffit produced to this specification shall be installed inaccordance with Practice D 4756. Reference shall also be madeto the manufacturers installation instructions for the specificproduct
5、 to 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
6、 not 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 estab
7、lish 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 618 Practice for Conditioning Plastics for TestingD 635 Test Method for Rate of Bur
8、ning and/or Extent andTime of Burning of Plastics in a Horizontal PositionD 696 Test Method for Coefficient of Linear Thermal Ex-pansion of Plastics Between 30C and 30C with aVitreous Silica DilatometerD 883 Terminology Relating to PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlastics
9、D 2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD 2457 Test Method for Specular Gloss of Plastic Films andSolid PlasticsD 3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)SidingD 3892 Practice for Packaging/Packing of Plasti
10、csD 4226 Test Methods for Impact Resistance of Rigid Poly-(Vinyl Chloride) (PVC) Building ProductsD 4756 Practice for Installation of Rigid Poly(Vinyl Chlo-ride) (PVC) Siding and SoffitD 5033 Guide for Development of ASTM Standards Relat-ing to Recycling and Use of Recycled Plastics3D 5947 Test Meth
11、ods for Physical Dimensions of SolidPlastics SpecimensE 631 Terminology of Building Constructions3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nologies D 883, D 1600, and E 631, unless otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 vinyl sofft, n
12、a shaped material, made 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
13、one or more layers ofpoly(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.
14、24 on Plastic BuildingProducts.Current edition approved Dec. 15, 2008. Published December 2008. Originallyapproved in 1985. Last previous edition approved in 2004 as D 4477 04a.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. F
15、or 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 Interna
16、tional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Use rigid PVC recycled plastic, as defined in GuideD 5033 if all the requirements in the sections on Terminology(Section 3), on Materials and Manufacture (Section 4), and onPhysical Requirements (Section
17、5) are met by the soffitcontaining PVC recycled plastic.4.3 The poly(vinyl chloride) soffit material, when tested inaccordance with Test Method D 635, 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. (
18、0.8 mm) is required.NOTE 3Caution: The flammability testing data, conclusions, andrecommendations of Test Method D 635 relate solely to the measurementand description of properties for classification of the poly(vinyl chloride)soffit material in response to flame under controlled laboratory conditio
19、nsand 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 p
20、itting.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 w
21、idth 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 measure
22、d in 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/
23、mm/C) 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. Variations in the glossmeter readings shall not bemore than 6 10.0 % or 6 5.0 points, when tested in accor-dance with 6.9.5.7
24、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
25、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 woodgrain panels.5.8.1 Uniformity of ColorWhen tested in accordance with6.10, the total color change, E, between a production specimen
26、and 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 co
27、nformance 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 necessary
28、 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 Condit
29、ion the testspecimen in accordance with Procedure A of Practice D 618and test under those conditions, unless otherwise specifiedherein.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
30、 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 be
31、tween 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 measu
32、rements. 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 D 5947, Method A or B, with theexception
33、that 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. M
34、easure 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 D 4226, Procedure A impactorhead configuration H.25. 4 in-lb increments (0.5 in height
35、increments with 8 lb falling weight) shall be used. Minimumsample 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 inaccor
36、dance with Test Method D 696.D 4477 0826.9 GlossMeasure gloss with a reflection metre in accor-dance with Test Method D 2457, except that a 75 incidentangle shall be used.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 exp
37、osedsurface. The area to be tested must be flat.6.9.1.2 Each reading shall be within the limits specified in5.6.6.9.1.3 This test method is not applicable to surface venti-lated soffit.6.10 Color UniformityCalculate the difference betweenthe LH,aH,bHcolor coordinates for a production specimen tothos
38、e of either the appropriate reference specimen or theagreed-upon color coordinates for that specific color product inaccordance with Test Method D 2244. Calculate the totaldifference, E, between the production specimen and the refer-ence specimen in accordance with Test Method D 2244.6.11 Deflection
39、: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.(12.7 mm) wide at the same level of elevation and 24 in. (610mm) apart, are set up with the provision of measuring h
40、eightdistance 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 ends of the unit are equidistant fromthe outside edges of the beams. The panel center area iscompared in height dis
41、tance 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 specification, producers and distribu-tors shall include a statement of compliance in conjunctionwith their name and address on
42、 product labels, invoices, salesliterature, and the like. The following statement is suggestedwhen sufficient space is available: “This PVC Soffit conformsto all the requirements established in ASTM SpecificationD 4477, developed cooperatively with the industry and pub-lished by the American Society
43、 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 abbreviated statement is suggested whenavailable space on labels is insufficient for the full statement:“Conforms to AS
44、TM Specification D 4477, (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 protection against damage in ordinaryhandling, transportation, and storage.8.2 The provisions of Practice D 3892
45、shall apply to thisspecification.9. Keywords9.1 plastic building products; plastic weatherability; re-cycled plastics; rigid PVC soffit; weatherability color-holdguidelinesSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue(D 4477-04a
46、) that may impact the use of this standard.(1) 6.4 was revised.ASTM 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
47、 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 andif not revised, either reapproved or withdrawn. Your comments are invited
48、 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, which you may attend. If you feel that your comments have not received a f
49、air 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).D 4477 083
