1、Designation: D4477 16 An 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 r
2、evision, 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. Scope1.1 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 beobtained 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 c
6、onsidered 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 a
7、ppropriate 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 and
8、/or Extent andTime of Burning of Plastics in a Horizontal PositionD696 Test Method for Coefficient of Linear Thermal Expan-sion of Plastics Between 30C and 30C with a VitreousSilica DilatometerD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD2244 Prac
9、tice 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 M
10、ethods 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 ofASTM Standards Relatingto Recycling and Use of Recycled Plastics (Withdrawn2007)3D5947 Test Methods f
11、or Physical Dimensions of SolidPlastics SpecimensE631 Terminology of Building ConstructionsE1753 Practice for Use of Qualitative Chemical Spot TestKits for Detection of Lead in Dry Paint Films3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nologies D883, D1600, and E631, unless
12、 otherwise specified.3.2 Definitions of Terms Specific to This Standard:3.2.1 vinyl sofft, na 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 c
13、oextruded or laminatedcapstock.1This 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 May 1, 2016. Published May 2016. Originallyapproved in 1985. Last previous editio
14、n approved in 2009 as D4477 09. DOI:10.1520/D4477-16.2For referenced ASTM standards, 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.3The las
15、t approved version of this historical standard is referenced onwww.astm.org.*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 States14. Materials and Manufacture4.1 The soffit, s
16、hall be made of 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.4.2 Use rigid PVC recycled plastic, as defined in GuideD5033 if all the requirements in the sections on Terminology(
17、Section 3), on Materials and Manufacture (Section 4), and onPhysical Requirements (Section 5) 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)
18、, with an average timeof burn not to exceed 10 s. A minimum sample thickness of0.030 in. (0.8 mm) is required. (WarningThe flammabilitytesting data, conclusions, and recommendations of TestMethod D635 relate solely to the measurement and descriptionof properties for classification of the poly(vinyl
19、chloride) soffitmaterial in response to flame under controlled laboratoryconditions and shall not be used for the description or appraisalof the fire hazard of vinyl soffit under actual fire conditions.)4.4 The PVC compound when extruded into soffit shallmaintain uniform color and be free of any vis
20、ual surface orstructural changes, such as peeling, chipping, cracking, flaking,or pitting.4.5 PVC soffit shall not contain elemental lead (Pb) orcompounds of that material other than traces incidental to rawmaterials or the manufacturing process. Compliance with thisrequirement shall be demonstrated
21、 by one of the methods in6.12.5. 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 within618 in. (3
22、.2 mm) of the nominal width when measured inaccordance with 6.3 and 6.4.5.2 ThicknessThe minimum thickness of the soffit shall be0.030 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.
23、 (3.2mm) when measured 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 ExpansionThe soffit shall have acoefficient of linear expansion not greater than 4.5 by 105in./
24、in./F (8.1 by 105mm/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. The average of all readings for a panel deter-mined in 6.9.1.2 shall not differ from the manufacturersspec
25、ified gloss value more than 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 differencefromMfg. Spec. GlossValueLess than or equal to 35 8G
26、reater than 35 105.7 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 the definedcolor space parameters
27、 for the specific color agreed uponbetween the purchaser and the manufacturer. The color speci-fied shall be uniform on the surface of the soffit panels, exceptin the case of multi-colored wood grain panels.5.8.1 Uniformity of ColorWhen tested in accordance with6.10, the total color change, E, betwe
28、en a production specimenand 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 6a = 1.0 and6b = 1.0.6. Test Methods6.1 GeneralThe inspection and test procedures containedin this section are us
29、ed to determine the conformance 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 essen
30、tial records necessary 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
31、Test ConditionsCondition 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 t
32、he center, the butt 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 m
33、m), the distance between 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
34、. Average the measurements. The average constitutesthe exposed width of soffit.D4477 1626.5 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
35、 A or B, with theexception 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 lon
36、g as the soffit specimen. Measure the maximumspace between the edge of the soffit specimen and the straight-edge 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-
37、lb increments (0.5 in heightincrements 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 Expansi
38、onConduct this test inaccordance 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
39、of the exposedsurface. 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 pl
40、ace. Such locations shall 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 surf
41、ace venti-lated soffit.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
42、the totaldifference, 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 sup
43、porting 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 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 thesuppo
44、rt beams so that the 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.6.12 Lead Content:6.12.1 Testing for lead content shall be conducted onextruded soffit using a
45、 rhodizinate-type lead swab test kitconforming to Practice E1753. Testing shall be performed inaccordance with the test kit manufacturers instructions. Thesoffit shall be deemed to comply with 4.5 if the test shows anegative or not-detected result; that is, the test does not indicatethe presence of
46、lead. The test shall be conducted separately onthe substrate and on any cap or film material.6.12.2 As an alternative to the method in 6.12.1, and as ameans of resolving any ambiguous results from that method, ananalytical method capable of detecting lead at least as low as0.02 percent by sample wei
47、ght shall be employed. Under thisalternative, neither the substrate nor any cap or film shallcontain a concentration of lead in excess of 0.02 percent byweight.7. Product Marking7.1 To aid identification of products conforming to allrequirements of this specification, producers and distributorsshall
48、 include a statement of compliance in conjunction withtheir name and address on product labels, invoices, salesliterature, and the like. The following statement is suggestedwhen sufficient space is available: “This product conforms toall the requirements established inASTM Specification D4477,develo
49、ped cooperatively with the industry and published by theASTM. Full responsibility for the conformance of this productto the specification is assumed by (name and address ofproducer or distributor).”7.2 The following abbreviated statement is suggested whenavailable space on labels is insufficient for the full statement:“Conforms toASTM D4477, (name and address of producer ordistributor).”8. Packing, Packaging, and Package Marking8.1 The soffit shall be packaged in such a manner as toprovide reasonable protection against damage in
