1、Designation: D 4477 04aAn 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification establishes requirements and testmethods for the materials, dimensions, ca
3、mber, 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
4、 in 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 specificprodu
5、ct 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 the standard. The values given in parentheses are forinformation only.1.6 The following precautionary caveat pertains to the
6、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 appropriate safety and healthpractices and determine the applicability of r
7、egulatory 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 and ElectricalInsulating Materials for TestingD 635 Test Method for Rate of Burning and/or Extent andTime of Burning of Self
8、-Supporting Plastics in a Horizon-tal PositionD 696 Test Method for Coefficient of Linear Thermal Ex-pansion of Plastics Between 30C and 30C with aVitreous Silica DialtometerD 883 Terminology Relating to PlasticsD 1600 Terminology Relating to Abbreviations, Acronyms,and Codes for Terms Relating to P
9、lasticsD 2244 Test Method for Calculation of Color Differencesfrom Instrumentally Measured Color CoordinatesD 2457 Test Method for Specular Gloss of Plastic Films andSolid PlasticsD 3679 Specification for Rigid (Unplasticized) Poly(VinylChloride) (PVC) SidingD 3892 Practice for Packaging/Packing of
10、PlasticsD 4226 Test Methods for Impact Resistance of Rigid Poly-(Vinyl Chloride) (PVC) Building ProductsD 4756 Practice for the Installation of Poly(Vinyl Chloride)(PVC) Siding and SoffitD 5033 Guide for the Development of Standards Relating tothe proper Use of Recycled PlasticsD 5947 Test Method of
11、 Physical Dimensions of Solid Plas-tic SpecimensE 631 Terminology of Building ConstructionsE 805 Practice for Identification of Instrumental Methods ofColor or Color-Difference Measurement of Materials3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nologies D 883, D 1600, and E
12、 631, unless 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 pr
13、esent in a coextruded 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 Nov. 1, 2004. Published November 2004. Originallypublished as D 4477
14、85. Last previous editionapproved in 2004 as D 4477 04.2For 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.1*A Su
15、mmary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Materials and Manufacture4.1 The soffit, shall be made of one or more layers ofpoly(vinyl chloride) (PVC) compound.Any lay
16、ers 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 GuideD 5033 if all the requirements in the sections on Terminology(Section 3), on Materials and Manufacture (Section 4), and onPhysical Requiremen
17、ts (Section 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 o
18、f0.030 in. (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 laborat
19、ory conditionsand 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,
20、flaking,or pitting.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 t
21、he nominal width 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)
22、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 Expansion The soffit shall havea coefficient of linear expansion not greater than 4.5 by 105in./in./F (8
23、.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. Variations in the glossmeter readings shall not bemore than 6 10.0 % or 6 5.0 points, when tested in accor-dance w
24、ith 6.9.5.7 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 thedefined color space parameters for the
25、specific color 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 product
26、ion 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 6Da = 1.0 and6Db = 1.0.6. Test Methods6.1 GeneralThe inspection and test procedures containedin this section are used to dete
27、rmine 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 essential recor
28、ds 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 Test Condi
29、tions Condition 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 cent
30、er, the butt edge, and thebottom of the top lock. The average of the three measurementsis the actual length.6.4 WidthInterlock two 2-ft (610-mm) long specimens inthe normal mode for installation. Lay the two specimens on aflat surface. Measure to the nearest116 in. (1.6 mm), thedistance between the
31、lowest butt edge of the top specimen andthe lowest butt edge of the bottom specimen. Make a measure-ment at one end of the specimens and at 6-in. (152.4-mm)intervals along the entire length, making sure that the measure-ment is made perpendicular to the butt edge. Average themeasurements. The averag
32、e constitutes the exposed width ofsoffit.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 that the vernier re
33、ading 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. Measure the maximums
34、pace 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 heightincrements with 8 l
35、b falling weight) shall be used. Minimumsample dimensions shall be 1.5 in. by 1.5 in. Samples shall beD 4477 04a2tested 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 inaccordance wi
36、th Test Method D 696.6.9 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 exposedsurface. The a
37、rea 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 tothose of either the ap
38、propriate 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:6.11.1 Specimen P
39、reparationThree 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 heightdistance at t
40、he 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 distance to the heigh
41、t 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 product labels, i
42、nvoices, 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 for Testing and M
43、aterials.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 ASTM Specification D
44、 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 shall apply to thi
45、sspecification.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 the following changes to this standard since the last issueD447704 that may impact
46、on the use of this standard. (Approved Nov. 1, 2004)(1) Revised sections 5.6 6.9 and 6.9.1.3.(2) Deleted footnote 3.(3) Revised reference document section, deleting reference toD 523 and adding reference to D 2457.Committee D20 has identified the location of the following changes to this standard si
47、nce the last issueD447796 that may impact on the use of this standard. (Approved Mar. 1, 2004)(1) Removed Section 1.3, Statement on Non Mandatory ColorHold Guidelines.(2) Amended safety statement - pertains only to Section 6.(3) Removed Colorhold guidelines and Discussion (3.2.1 and3.2.2) as well as
48、 temperate northern climate (3.2.10) fromterminology section.(4) Removed section call outs in 5.8.(5) Removed Note 5 pertaining to colorhold guidelines.(6) Revised Section 6.7 on impact testing of soffit.(7) Removed reference 8, more than one instrument manufac-turer was listed - not required to lis
49、t all.(8) Removed Figure 1.(9) Removed Appendix X1, non-mandatory weathering sec-tion.(10) Reworked Section 5.9 removing references to section 6.9.(11) Removed Section 6.9.(12) Removed former Note 6 pertaining to weathering (ap-peared after section 5.9).(13) Reworked ISO Equivalency statement.(14) In Section 7.1 change “siding” to “soffit”.(15) Removed reference to ASTM D1435 in referenced docu-ments section.D 4477 04a3(16) Replaced reference toASTM D374 withASTM D5947 forthe measurement of test specimens.(17) Removed Color Guidel
