1、Designation: C921 10Standard Practice forDetermining the Properties of Jacketing Materials forThermal Insulation1This standard is issued under the fixed designation C921; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practice covers jackets applied
3、over thermal insu-lation on piping and equipment, including materials appliedsolely for physical protection, and materials applied as vaporretarders.1.2 This practice provides material and physical require-ments, or both, for jackets. Guidance in selecting the properjacket for a given application ca
4、n be found in Guide C1423.1.3 This practice does not cover field applied mastics orbarrier coatings and their attendant reinforcements, nor does itcover jackets for buried insulation systems.1.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are
5、mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety an
6、d health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for PressureVessels and for General ApplicationsA336/A336M Specifica
7、tion for Alloy Steel Forgings forPressure and High-Temperature PartsA653/A653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA792/A792M Specification for Steel Sheet, 55 %Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessB209 Spec
8、ification for Aluminum and Aluminum-AlloySheet and PlateC168 Terminology Relating to Thermal InsulationC390 Practice for Sampling and Acceptance of ThermalInsulation LotsC921 Practice for Determining the Properties of JacketingMaterials for Thermal InsulationC1258 Test Method for Elevated Temperatur
9、e and Humid-ity Resistance of Vapor Retarders for InsulationC1263 Test Method for Thermal Integrity of Flexible WaterVapor RetardersC1338 Test Method for Determining Fungi Resistance ofInsulation Materials and FacingsC1423 Guide for Selecting Jacketing Materials for ThermalInsulationD774/D774M Test
10、Method for Bursting Strength of Paper3D828 Test Method for Tensile Properties of Paper andPaperboard Using Constant-Rate-of-Elongation Appara-tus3D882 Test Method for Tensile Properties of Thin PlasticSheetingD1204 Test Method for Linear Dimensional Changes ofNonrigid Thermoplastic Sheeting or Film
11、at ElevatedTemperatureE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE96/E96M Test Methods for Water Vapor Transmission ofMaterials2.2 TAPPI Standards:1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subc
12、ommittee C16.33 on InsulationFinishes and Moisture.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1979. Last previous approved in 2009 as C92109. DOI: 10.1520/C0921-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Serv
13、ice at serviceastm.org. For 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C70
14、0, West Conshohocken, PA 19428-2959, United States.T461 Flame Resistance of Treated Paper and Paperboard43. Terminology3.1 DefinitionsDefinitions in Terminology C168 apply toterms used in this practice, including the word jacket, which isdefined as 9a form of facing applied over insulation9.Incommon
15、 use, the terms jacket and jacketing shall be consideredinterchangeable.4. Classification4.1 Type ISemi-rigid, for physical abuse resistance,physical support, and finish.4.1.1 Grade 1: Aluminum sheet metal,4.1.2 Grade 2: Stainless steel sheet metal,4.1.3 Grade 3: Coated steel sheet metal, and,4.1.4
16、Grade 4: Plastic sheet.4.2 Type II: Flexible for vapor retardance, or physicalsupport or finish combination thereof.4.2.1 Grade 1:Laminated multi-layer,4.2.1.1 Class A: Below ambient application; extremely lowpermeance,4.2.1.2 Class B: Below ambient application; very low per-meance,4.2.1.3 Class C:
17、Below ambient application; low per-meance, and4.2.1.4 Class D: Above ambient application; no vapor re-tarder needed,4.3 Grade 3: Fabric4.3.1 No grades; support only, vapor retarder properties notapplicable.4.4 Grade 4: Plastic film4.4.1 Class A: Below ambient application; extremely lowpermeance,4.4.
18、2 Class B: Below ambient application; very low per-meance,4.4.3 Class C: Below ambient application; low permeance,and4.4.4 Class D:Above ambient application; no vapor retarderneeded.5. Significance and Use5.1 Jackets provide one or more of three basic functionswhen applied over thermal insulation:5.
19、1.1 Physical protection, in the form of abuse resistanceand added structural integrity or support for the insulatingmedium.5.1.2 Resistance to moisture vapor intrusion into the insu-lating medium in those applications where ambient and oper-ating temperatures create a vapor driving force toward the
20、cold(insulated) surface.5.1.3 Exposed finish for the insulation5.2 Type I semi-rigid jackets, in the form of metallic orheavy gauge plastic sheet, are used over insulation on piping orequipment to provide high abuse resistance. In this case, thematerial is also referred to as a protective jacket.5.3
21、 The vapor retarding Type II flexible jacket (Grades 1and 2, Classes A, B and C) is used by itself in below ambientservice applications not requiring high abuse resistance. Inthose cases where high abuse resistance is required, it isapplied to the insulation prior to installation of a protectivejack
22、et.5.4 The non vapor-retarding Type II flexible jacket (Grades1 and 2, class D) is used by itself in above ambient serviceapplications not requiring high abuse resistance. It may also beused for support of the insulation prior to installation of aprotective jacket in above ambient applications requi
23、ring highabuse resistance.5.5 Since semi-rigid protective jackets do not perform avapor retarder function, and flexible jackets do not providehigh abuse resistance, the various materials categorized hereinare commonly used in combination, but not interchangeably.5.6 Vapor-retarding properties are no
24、t necessary for systemsoperating above ambient.5.7 In applications where there is a need to reduce surfaceemittance, non-metallic jacket, or painted, or film coveredmetal jacket may be specified.5.8 For direct outdoor exposure, certain Type I jackets maybe used. UV resistance is an important conside
25、ration with theGrade 4 materials. Consult with the manufacturer for recom-mendations on suitability for these applications.6. Materials and Manufacture6.1 Jackets shall be composed of a single material or alamination of several component The material shall be in theform of rolls or sheets or perform
26、ed to fit the surface to whichthey are to be applied. The materials may be applied in the fieldor may be a factory-applied composite with the insulation.6.2 Type I - Semi-rigid Protective: :6.2.1 Semi-rigid jackets consist of metal jackets (Grades1,2, and 3) and heavy gauge plastic jackets (Grade 4)
27、.6.2.2 Metal jackets are those whose primary material (usu-ally the component of greatest thickness) is metal, such asaluminum alloy, stainless steel, or aluminum - zinc alloy coatedsteel sheet. Depending upon the metal, it may be available in asmooth mill finish, corrugated, embossed, painted or co
28、veredwith a laminated, protective film. The inner surface (that side incontact with the insulation) is usually coated or covered withcorrosion inhibiting film.6.2.3 Aluminum Alloy jackets are commonly manufacturedto Specification B209, Type 3003, 3004, 3104, 3105, 5005,5052, or 1100. Aluminum temper
29、 ranges from half hardthrough full hard. Thicknesses generally available are 0.010 to0.063 in.(0.25 to 1.60 mm) nominal.6.2.4 Stainless steel jackets are manufactured to Specifica-tion A240/A240M, Type 301, 302, 304, or 316 stainless.Thicknesses generally available are from 0.010 to 0.032inches(0.25
30、 to 0.81 mm) nominal.6.2.5 Coated steel jackets are manufactured to requirementsin Specifications A336/A336M, A653/A653M,orA792/A792M as appropriate. Thickness generally available is 0.016inches (0.41 mm) nominal. Other thicknesses shall be availableas agreed upon between purchaser and seller.6.2.6
31、Heavy gauge plastic Type I, Grade 4 jackets aremanufactured in plastic films or sheet with materials such as4Available from Technical Association of the Pulp and Paper Industry (TAPPI),15 Technology Parkway South, Norcross, GA 30092, http:/www.tappi.org.C921 102Polyvinylchloride (PVC) and Polyvinyli
32、denechloride (PVdC)and are available in various thicknesses.6.3 Type II - Flexible:6.3.1 Type II, Grade 1 jackets are made of any of a numberof different combinations of films, foils, cloths, papers andreinforcements.6.3.2 Type II, Grade 3 jackets include, but are not limited to,cotton canvas (typic
33、ally 4, 6, or 8 oz/sq. yd. (0.14, 0.20, or 0.27kg/sq. m), woven glass fiber yarns, pre-sized glass cloth, andknit, woven, or non-woven synthetic fibers.6.3.3 Type II, Grade 4 jackets are manufactured from any ofa number of different plastic materials, ranging from soft andflexible to hard and rigid.
34、 These materials include, but are notlimited to: polyvinylchloride, polyvinylfluoride, acrylic, andpolyvinylidenechloride. Thicknesses vary with the type ofmaterial and must be appropriate to the intended application.7. Material and Physical Requirements7.1 Type I Semi-rigid Protective Jackets:7.1.1
35、 7.1.1 Material properties for semi-rigid jackets areshown in Table 1.7.2 Type II Flexible Jackets:7.2.1 Physical property requirements that vary by Class orGrade are shown in Table 2. Common requirements for Type IIjackets are specified in this section.7.2.2 All jackets shall demonstrate a maximum
36、flame spreadof 25 and smoke developed of 50 when tested on theservice-exposed side for Surface Burning Characteristics (SBC), when tested in accordance with 10.4.7.2.3 Jackets which contain paper or other absorbent mate-rials shall not demonstrate an increase in char length of morethan 20% when test
37、ed for flame retardance permanence inaccordance with 10.5.7.2.4 All jackets shall not corrode, delaminate nor showpermeance higher than the maximum for the class, when testedfor elevated temperature and humidity resistance in accordancewith 10.8.7.2.5 All jackets shall not exhibit growth of fungus,
38、or mold,when tested for fungi resistance in accordance with Section10.7.7.2.6 All jackets shall not crack or delaminate when testedfor thermal integrity at the maximum service exposure tem-perature of the jacket in accordance with 10.9.8. Dimensions and Tolerances8.1 Dimensions for roll or sheeted m
39、aterials shall be asspecified by the purchaser.8.2 Except for metal jackets, tolerance for roll materialsshall be 618 in. (63 mm) on width and +5,-0 % on length8.3 Except for metal jackets, tolerance for roll materialsshall be 618 in. (6 3mm) on length and width.8.4 Tolerances for metal jackets shal
40、l be as called out inSpeicifactions B209 or A240/A240M, as applicable to mate-rial.9. Workmanship and Finish9.1 There shall be no defects in materials or workmanshipthat will adversely affect the required performance of thejacket.TABLE 1 Physical Properties for Type I JacketsTYPE I JACKETS GRADE 1Al
41、uminumGRADE 2Stainless SteelGRADE 3Coated SteelGRADE 4Plasticthickness in. (mm) 0.0060.050(0.151.27)0.0100.032(0.0250.81)0.016(0.41)0.0100.040(0.251.00)Outside finishoption 1 smooth smooth smoothoption 2 corrugated corrugated corrugated matteoption 3 embossed embossed embossed glossoption 4 painted
42、painted painted coloredoption 5 laminate laminate laminateCorrosion Inhibiting Coatingsoption 1 kraft/PE kraft/PE kraft/PEn/aoption 2 ionomer ionomer ionomeroption 3 coating coating coatingAvailable Metal Alloysof Plastic Polymer Type3003, 3004,3105, 3104,5005, 5052,1100301, 302,304, 3161010, 1015,1
43、020PVCPVdCTABLE 2 Physical Properties for Type II JacketsTYPE II JACKETS GRADE 1LaminatedGRADE 3FabricGRADE 4PlasticACLASS APermeanceperms, maxng PA sm, max0.010.58. 0.010.58CLASS BPermeanceperms, maxng PA sm, max0.021.15. 0.021.15CLASS CPermeanceperms, maxng PA sm, max0.052.90. 0.052.90CLASS D no p
44、ermeancerequirement. . .TensileStrengthlbs/in width, min.N/mm width, min.305.3305.371.2Burst Strength,minpsi(kPa)55(380)55(380)60(411)DimensionalChangepercent max 0.50 0.50 1.0AGRADE 2 was deleted in 2010 because the material was no longer producedand was replaced with GRADE 4.C921 1039.2 There shal
45、l be no defects that adversely affect theappearance of the jacket.9.3 There shall be no defects that would affect the ability ofthe user to process material.10. Test Methods10.1 Permeance: Test in accordance with Test MethodE96/E96M, (desiccant method at 73F (23 C) and 50% RH)10.2 Tensile Strength:1
46、0.2.1 Test the tensile strength of plastic film jackets (TypeII, Grade 2) in accordance with Test Method D882, with resultsreported in pounds per inch width of specimen width (Newtonsper millimeter width).10.2.2 Test the tensile strength of all other jackets inaccordance with Test Method D828, with
47、results reported inpounds per inch of specimen width (Newtons per millimeterwidth).10.2.2.1 Tested specimens shall be 2 in. (51 mm) width with1 in. (25 mm) between jaws.10.3 Burst StrengthTest in accordance with Test MethodD774/D774M.10.4 Surface Burning Characteristics. Test in accordancewith Test
48、Method E84, D828.10.5 Flame Retardance Permanence: Test in accordancewith TAPPI T461.10.6 Dimensional Stability: Test in accordance with TestMethod D1204.10.6.1 Expose the specimens to a temperature of 150 6 4F(66 6 2C) for 24hrs.10.7 Fungi Resistance:Test in accordance with Test Method C1338.10.7.1
49、 Test both sides of laminated products that use dis-similar materials, except metal foil need not be tested.10.7.2 Test either side of plastic film materials.10.7.3 Test three specimens of the selected sample andinspect for growth on any of the three.10.8 Elevated Temperature and Humidity Resistance:Test in accordance with Test Method C1258. Low-Temperature Resistance.10.9 Thermal Integrity:Test in accordance with Test Method C1263.11. Sampling11.1 Inspection and qualification shall be in accordance withPractice C390. Other provisions for sampling can be agreedupo
