1、Designation: D4726 18 An American National StandardStandard Specification forRigid Poly(Vinyl Chloride) (PVC) Exterior-Profile ExtrusionsUsed for Assembled Windows and Doors1This standard is issued under the fixed designation D4726; the number immediately following the designation indicates the year
2、 oforiginal adoption or, in the case of 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 for the ma-
3、terial properties, including dimensional stability,weatherability, and extrusion quality, of rigid poly(vinyl chlo-ride) (PVC) exterior profile extrusions used for assembledwindows and doors. Methods for testing and for identifyingexterior profile extrusions that comply with this specificationare al
4、so provided.1.2 The use of rigid PVC recycled plastic in this productshall be in accordance with the requirements in Section 6.NOTE 1Information with regard to application, assembly, and instal-lation should be obtained from the manufacturers of the profiles and of thewindows and doors.NOTE 2Refer t
5、o Specification D3678 for interior profile extrusions.1.3 Color-hold guidelines are provided in an appendix forthe manufacturers product development and quality perfor-mance use.1.4 Color-hold guidelines are presently limited to white,grey, beige, light brown, and dark brown (see Figs. X1.1through X
6、1.5). Additional colors will be added as colorguidelines are developed.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are for informa-tion only.NOTE 3There is no known ISO equivalent to this standard.1.6 The text of this standard references n
7、otes and footnotes,which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be consideredas requirements of this standard.1.7 The following safety hazards caveat pertains only to thetest methods portion, Section 11, of this specification: Thissta
8、ndard 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, health, andenvironmental practices and determine the applicability ofregulatory limitations prior to use.1.8 This intern
9、ational standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Co
10、mmittee.2. Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1042 Test Method for Linear Dimensional Changes ofPlastics Caused by Exposure to Heat and MoistureD1435 Practice for Outdoor Weathering of PlasticsD1600 Termino
11、logy forAbbreviated Terms Relating to Plas-ticsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD3678 Specification for Rigid Poly(Vinyl Chloride) (PVC)Interior-Profile ExtrusionsD3892 Practice for Packaging/Packing of PlasticsD4216
12、 Specification for Rigid Poly(Vinyl Chloride) (PVC)and Related PVC and Chlorinated Poly(Vinyl Chloride)(CPVC) Building Products CompoundsD4226 Test Methods for Impact Resistance of Rigid Poly-(Vinyl Chloride) (PVC) Building ProductsE631 Terminology of Building ConstructionsE805 Practice for Identifi
13、cation of Instrumental Methods ofColor or Color-Difference Measurement of MaterialsG147 Practice for Conditioning and Handling of Nonmetal-lic Materials for Natural and Artificial Weathering Tests3. Terminology3.1 GeneralDefinitions are in accordance with Terminolo-gies D883 or E631 and D1600, unles
14、s otherwise indicated.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 Aug. 1, 2018. Published September 2018. Originallyapproved in 1987. Last previous edition
15、approved in 2015 as D4726 15. DOI:10.1520/D4726-18.2For 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.*A Summary
16、 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in
17、 the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.2 Definitions of Terms Specific to This Standard:3.2.1 color-hold guidelinestarget color regions within athree-d
18、imensional model which constitute acceptable appear-ance retention levels of color change resulting from weatheringof a specific product type and color.3.2.2 temperate northern climatein weather testing, aNorth American metropolitan area testing site located within73 to 100 W longitude and 37 to 45
19、N latitude.4. Classification4.1 Color RegionsThe color region for a color is deter-mined by measuring the Hunter L, a, b color values for asample. Use the integer value (by truncating any fractionalresults) to determine the color region for the color using thefollowing region boundaries.4.1.1 Region
20、 1Beige:L = 60 to 87a=2.5to4.0b = 6.5 to 234.1.2 Region 2Dark Brown:L = 13 to 33a=1.0to6.0b = 1.0 to 6.54.1.3 Region 3Gray:L = 33 to 74a=3to4b=5.5to5.54.1.4 Region 4Light Brown:L = 30 to 60a = 1.5 to 12.5b = 3.0 to 12.54.1.5 Region 5White:L = 83 to 100a=4to0b = 5.5 to +5.5NOTE 4L, a, b is determined
21、 in accordance with the Hunter L, a, bopponent color space system in Test Method D2244.5. Significance and Use5.1 The purpose of this specification is to establish arecognized standard of quality for rigid poly(vinyl chloride)(PVC) exterior weatherable profile extrusions for use inassembling windows
22、 and doors. The information contained inthis specification is intended to be helpful to producers,distributors, and users, and to promote understanding betweenbuyers and sellers. It is also intended to serve as the basis forspecification requirements of exterior windows and doorswhich are made from
23、rigid PVC profile extrusions in theirconstruction.6. Materials and Manufacture6.1 The profile extrusions used for assembled windows anddoors shall be made principally of weatherable, rigid poly(vi-nyl chloride) (PVC) compounds meeting or exceeding therequirements of Class 1-20131-13 as defined in Sp
24、ecificationD4216.NOTE 5Non-PVC materials may be used as a capstock.6.2 Rigid PVC recycled plastic is acceptable for use in thisproduct if all the requirements in the sections on Terminology(Section 3), Materials and Manufacture (Section 6), PhysicalRequirements (Section 7), and Performance Requireme
25、nts(Section 8) are met by the extrusions containing PVC recycledplastic.6.3 The PVC compound in the extruded section shall havevisual uniform color and be free of any visual surface orstructural changes, such as peeling, chipping, cracking, flaking,or pitting.6.4 Rework MaterialClean, homogeneous PV
26、C reworkmaterial or rework material containing PVC capstock gener-ated from the manufacturers own production of the same classcompound is acceptable for use by the same manufacturerproviding that the extruded profiles meet all the requirementsof this specification. Clean principally PVC rework mater
27、ialcontaining non-PVC capstock is acceptable for use in thesubstrate of a capstocked product by the same manufacturer,providing that the extruded profiles meet all of the require-ments of this specification.6.5 The PVC compound shall have successfully met theweathering requirements for six months at
28、 each climatic testingsite prescribed in A1.1.1 prior to use in production of exterior-profile extrusions for either market development or sales.NOTE 6The six-month-test requirement constitutes a screening pro-cess to eliminate catastrophic failure in the marketplace.7. Physical Requirements7.1 Dime
29、nsionsThe size, thickness, and dimensional tol-erances of the exterior profiles shall be as agreed upon betweenthe supplier and the purchaser in the purchase order, or byestablished internal process control standards.7.2 Dimensional StabilityThe dimensional stability of theexterior-profile extrusion
30、s shall be determined in accordancewith 11.3. Extrusions over 0.040 in. (1.02 mm) shall have amaximum average shrinkage of 2.2 % for all sides measured,with no single value exceeding 2.4 %. Extrusions of 0.040 in.(1.02 mm) or less shall have a maximum average shrinkage of3%.7.3 Impact ResistanceFlat
31、 sections of the exterior profileextrusion shall have a minimum brittle impact failure of 1.0in.lb/mil (4450 J/m) when tested in accordance with TestMethods D4226, Procedure B, using impactor C.125. Refer to11.4.8. Performance Requirements8.1 Weathering:8.1.1 The exposures listed in Annex A1 shall b
32、e conductedin order to meet the requirements of this specification. Allexposures shall be conducted at an angle of 45 S, plywood-backed, in accordance with Practice D1435 and Practice G147.8.1.2 After six-month and 1-year exposure times, the mini-mum mean impact for 20 measurements conducted on thee
33、xposed specimens shall be at least 0.6 inlb/mil (2670 J/m).Test impact in accordance with 11.4, A1.4, and A1.5.8.1.3 After each exposure time, the tested specimens shallmaintain a visual uniform color and be free of any visualD4726 182changes in appearance at the surface, such as peeling, chipping,c
34、racking, flaking, and pitting when tested in accordance withAnnex A1.NOTE 7It is recommended that manufacturers use the color-holdguidelines in Appendix X1 to ensure quality performance.8.1.4 Weatherability conformance testing requirements areto reflect performance of a “typical” extrusion system pr
35、ofilerepresenting a specific PVC compound and a specific extrusiontechnology. In no case is there an implied requirement fortesting all the various shaped profiles. The lengthy outdoorweatherability testing shall be performed concurrently withmarket development of new applications and sales of profi
36、lesto existing markets. Completion of weatherability testing priorto marketing of the product is not required. The profileextrusion producer shall immediately respond in terms ofcompound change or extrusion technology change to unsatis-factory weatherability behavior of the profiles under test in an
37、yclimatic test site at any stage of the weatherability testing.9. Workmanship, Finish, and Appearance9.1 The extrusions shall meet internal process control stan-dards in section, color, and finish. The extrusions shall besubstantially straight and free from defects that might affectappearance or ser
38、viceability.10. Sampling10.1 Select samples using a statistically acceptable proce-dure. The samples shall be representative of the compoundused.11. Test Methods11.1 GeneralUse the inspection and test procedures con-tained in this section to determine the conformance of productsto the requirements o
39、f this specification. A producer or dis-tributor representing products as conforming to this specifica-tion shall use statistically based sampling plans that areappropriate to each manufacturing process. Keeping essentialrecords are necessary to document with a high degree ofassurance the claim that
40、 all of the requirements of thisspecification have been met.Additional sampling and testing ofthe product, as agreed upon between the supplier and thepurchaser, is not precluded by this section.11.2 Conditioning of SpecimensCondition the test speci-mens in accordance with ProcedureAof Practice D618.
41、 For thepurpose of quality control testing, the minimum conditioningtime shall be four hours.11.3 Dimensional Stability:11.3.1 Determine the dimensional stability in accordancewith Test Method D1042, except that one or more specimensshall be exposed to either of the following test cycles:11.3.1.1 30
42、 min immersed in water maintained at 180 6 2F(82 6 1 C), or11.3.1.2 30 min conditioned in a forced-ventilation oven at180 6 2F (82 6 1 C).11.3.2 Specimens shall condition for no less than1hinaccordance with Procedure A of Practice D618, prior tomeasurement. If a specimen were to fail, select and ret
43、est twoadditional specimens.11.4 Impact TestDetermine the impact strength in accor-dance with Test Methods D4226, Procedure B, using the C.125impactor.12. Packing, Packaging, and Package Marking12.1 The exterior profile extrusions shall be packaged insuch a manner as to provide reasonable protection
44、 againstdamage in ordinary handling, transportation, and storage.12.2 Provisions of Practice D3892 shall apply to this speci-fication.12.3 Marking on each package of extruded profile extru-sions shall include the following:12.3.1 Manufacturers name or trademark;12.3.2 Identity of code number of extr
45、usion profiles;12.3.3 Class of compound (Specification D4216) used inprofiles;12.3.4 The designation ASTM D4726, affirming that theproduct so marked has been qualified to all the provisions ofthis specification, and12.3.5 The date and any other relevant information, such asfactory, machine, producti
46、on shift, and so forth, either directlyor all or partly coded.13. Keywords13.1 color-hold guidelines; doors; exterior-profile extru-sions; poly(vinyl chloride) (PVC); recycled plastic; windowsD4726 183ANNEXES(Mandatory Information)A1. WEATHERABILITY PROCEDUREA1.1 Summary of Procedure of DeterminingW
47、eatherabilityA1.1.1 Flat section specimens cut from finished productlineals or laboratory extruded samples are exposed in accor-dance with Practice D1435 and Practice G147 at 45 S,plywood-backed, in a hot, dry (desert) climate; a hot, humidclimate; and in a northern temperate climate for periods of
48、sixmonths, one year and two years.A1.1.2 Degree of retention of the original impact strengthdue to weather exposure in each exposure site is measured aftersix-months and one-year exposure.A1.1.3 The acceptability of color uniformity, and surfacechanges resulting from weathering at each test site and
49、 eachexposure frequency is determined by visual observation incomparison to the unexposed specimens.A1.2 SignificanceA1.2.1 The processing of poly(vinyl chloride) (PVC) com-pounds has influence on impact retention and some influenceon appearance retention. For this reason samples prepared forimpact retention must be processed in a manner similar to thecommercial product while still permitting the use of laboratoryscale equipment.NOTE A1.1It is recommended that manufacturers use the color-holdguidelines in Appendix X1 to ensure quality pe
