1、Designation: C 551 07Standard Specification forAsbestos-Cement Fiberboard Insulating Panels1This standard is issued under the fixed designation C 551; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 specification covers asbestos-cement insulatingpane
3、ls consisting of a core of insulating fiber board sandwichedbetween, and bonded to, two sheets of asbestos-cement facingboard. Asbestos-cement insulating panels are designed forexterior and interior walls, partitions, curtain walls, roof decks,and for decorative purposes.1.2 All measurements and tes
4、ts necessary for determiningthe conformity of asbestos-cement insulating panels with thisspecification are made in accordance with the methods coveredin Section 9.1.3 The values stated in SI units are to be regarded as thestandard. The values stated in parentheses are provided forinformation only.1.
5、4 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions, when working with asbestos-cement products, minimize the dust that results. For informa-tion on
6、the safe use of chrysoltile asbestos, refer to “Safe Useof Chrysotile Asbestos: A Manual on Preventive and ControlMeasures.”21.5 The following safety hazards caveat pertains only to thetest method portion, Section 9, of this specification. Thisstandard does not purport to address all of the safety c
7、oncerns,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 regulatory limita-tions prior to use. See 1.4 for a specific hazard warning.2. Referenced Documents2.1 ASTM Standards:3
8、C 150 Specification for Portland CementC 208 Specification for Cellulosic Fiber Insulating BoardC 220 Specification for Flat Asbestos-Cement SheetsC 236 Test Method for Steady-State Thermal Performanceof Building Assemblies by Means of a Guarded Hot Box4C 458 Test Method for Organic Fiber Content of
9、 Asbestos-Cement ProductsC 518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC 595 Specification for Blended Hydraulic CementsC 618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use in ConcreteD 2946 Terminology for Asbe
10、stos and AsbestosCementProductsE 96/E 96M Test Methods for Water Vapor Transmission ofMaterials2.2 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)52.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage52.4 Other Standards:Uniform Freight Classification Rules6Nati
11、onal Motor Freight Classification Rules73. Terminology3.1 Definitions:3.1.1 dimensionsfor the purpose of this specification,include the length, width, thickness, and squareness (definedhereunder) of asbestos-cement insulating panels as measuredunder specified conditions.3.1.2 flexural strengththe av
12、erage breaking load in new-tons per meter of width (or lbf/ft of width) of dried specimensloaded as simple beams on a 762 mm (30 in.) span with theload applied equally and simultaneously at both one-thirdpoints of the span.NOTE 1The flexural performance is defined as the moment capacity1This specifi
13、cation is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on Asbestos - Cement Sheet Products and Accessories.Current edition approved Nov. 1, 2007. Published December 2007. Originallyapproved in 1964. Last previo
14、us edition approved in 2003 as C 551 98 (2003)e1.2Available from The Asbestos Institute, http:/ 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 Su
15、mmary page onthe ASTM website.4Withdrawn.5Available from Standardization Documents, Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-5094.6Available from the Uniform Classification Commission, Room 1106, 222 S.Riverside Plaza, Chicago, IL 60606.7Available from National Motor F
16、reight Inc., 1616 “P” St. NW, Washington, DC20036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.in Nm/m (or ftlbf/ft) of width, obtained from the product of flexuralstrength and span divided by 6.3.1.3 lotshipment, or part thereof,
17、 of a quantity of productof identical type produced during a single production run.3.1.4 squarenessdeviation from squareness is defined asthe percent difference in the length of the two diagonals of apanel. Panels with perfect squareness have zero differencebetween the length of their diagonals.3.1.
18、5 Additional terminology is presented in TerminologyD 2946.4. Materials and Manufacture4.1 Asbestos-cement insulating panels shall be composed ofan insulating core sandwiched between, and bonded to, twofacing sheets of asbestos-cement. The insulating core shall bemanufactured from wood, fiber, or ot
19、her suitable vegetablefiber, by a felting or molding process, with suitable sizingmaterial incorporated into the product to render it waterresistant. The material shall be subjected to such dryingtemperatures as to effect complete destruction of rot producingfungi. The asbestos-cement facing boards
20、shall be composed ofa combination of asbestos fiber and portland cement prescribedin Specification C 150, or portland slag or pozzolan cementsmeeting Specification C 595, with or without the addition ofcuring agents or additives meeting Specification C 618, water-repellent substances, mineral filler
21、s, coatings, pigments, ormineral granules, formed under pressure and cured to meet thephysical requirements of this specification. Sheets may containnot more than mass percent of non-deleterious organic com-ponents as determined by Test Method C 458. The bondingadhesive shall cover essentially 100 %
22、 of the bonding surfaces.5. Dimensions, Mass, and Permissible Variations5.1 Physical Requirements:5.1.1 Asbestos-cement facing sheets shall conform to therequirements for Type F or U of Specification C 220.5.1.2 The insulating core board shall conform to the require-ments for Class C or E of Specifi
23、cation C 208.5.1.3 Flexural StrengthThe average breaking load, ob-tained by loading equally and simultaneously at both one-thirdpoints of the span, for panel specimens dried for 24 h at 70 63C (160 6 5F) shall not be less than shown in Table 1.5.1.4 Vapor PermeabilityThe average vapor permeabilityof
24、 any panel board thickness shall not exceed 0.35g/MPa.s.m2(81 perms, or grains of water vapor per square footper hour per inch of water vapor pressure differential) whentested according to the wet cup method of Test MethodsE 96/E 96M.5.1.5 Thermal Resistance, RThe average thermal resis-tance, R, Km2
25、/W (deg Fhft2/Btu) of the panel shall not beless than the requirements in Table 2 when tested in accordancewith Test Method C 236 or Test Method C 518.5.1.6 Adhesive Line BondThe glue shall be suitable foroutdoor use and have such adhesion that specimens resist theshear stress generated during flexu
26、ral testing with all failuresoccurring within the core board and not at any of the glue lines.5.2 Dimensions:5.2.1 This specification is applicable only for panels of thedimensions shown in Table 3 and Table 4.5.2.2 Permissible Variation in Dimensions:5.2.2.1 ThicknessThe average thickness of all pa
27、nelssupplied under this specification shall be as prescribed in Table4. The average thickness of any one sheet shall not differ fromthe average of all sheets by more than 10 percent.5.2.2.2 Width and LengthThe permissible variation fromthe nominal width shall be 3 mm (0.12 in.) and +1.5 mm(0.06 in.)
28、 and, from the nominal length, 3 mm (0.12 in.) and+1.5 mm (0.06 in.) as measured after 48 h at 25 6 5C (70 610F) and 50 % relative humidity.5.2.2.3 SquarenessThe deviation from squareness shallnot exceed 0.2 % of width or length.6. Supplementary and Finishing Pieces, Accessories6.1 Fasteners of suit
29、able size and type for securing asbestos-cement insulating board to metal or wood supporting membersof all sizes and types shall be furnished when specified. Thefasteners shall be corrosion-resistant and complete informationregarding the supporting structure must be supplied by thepurchaser.7. Workm
30、anship, Finish, and Appearance7.1 WorkmanshipThe surfaces on both sides of the panelshall be free of major defects that will impair appearance,erection, use, or serviceability.7.2 FinishThe surfaces of the panel shall be smooth,grained, granuled-coated, or otherwise textured.7.3 ColorBoth surfaces o
31、f the panel will be the naturalcolor of the asbestos-cement products or may be colored by theaddition of mineral pigments, chemical impregnation, pig-mented coatings, veneers, or embedded mineral granules.7.4 EfflorescenceEfflorescence that sometimes may ap-pear on asbestos-cement insulating panels
32、is not a defect andshould not result in a permanent change in color.8. Rejection and Retesting8.1 If one of the samples fails to conform to any one of therequirements of this specification, a second sample from thesame lot shall be prepared and tested. The results of the retestshall be averaged with
33、 the results of the original test todetermine compliance with this specification.TABLE 1 Flexural Strength Requirements for PanelsNominal Thickness Minimum Breaking Loadmm (in.) N (lbf)17 (1116) 1300 30029 (118) 2700 60040 (1916) 4000 90051 (2) 5300 1200TABLE 2 Thermal Resistance, RNominal Thickness
34、 R Value at 24C (70F)mm (in.) K.m2/W (F.h.ft2/Btu)17 (1116) 0.23 (1.3)29 (118) 0.44 (2.5)40 (1916) 0.59 (3.3)51 (2) 0.71 (4.0)C5510728.2 Failure to conform to any one of the requirements of thisspecification, upon retest as prescribed above, shall constitutegrounds for rejection. In case of rejectio
35、n, the seller shall havethe right to reinspect the rejected shipment and resubmit the lotafter removal of the portion of the shipment not conforming tothe specified requirements, provided this is done within 20days after receipt of written notice of the specific cause forrejection.9. Test Methods9.1
36、 Sampling:9.1.1 Select at random a number of panels from eachshipment or lot, representing a product of the same kind. Table5 shows the number of panels to be selected from shipments ofvarious quantities.9.1.2 Additional panels may be taken at the discretion of theinspector.9.2 Flexural Strength:9.2
37、.1 DefinitionFlexural strength, for the purpose of thisspecification, is the average breaking load, in newtons (orpounds-force) of test specimens dried as specified, loaded assimple beams with the load applied equally and simultaneouslyto both one-third points of the span, and tested by the methodpr
38、escribed in 12.3.9.2.2 SignificanceThis is a routine test method to indicatethe strength of the product.9.2.3 ProcedureCut two specimens 70 3 30 cm (30 3 12in.) from each panel to be tested, with the long dimension ofthe samples parallel to the long dimension of the panel. Dryeach specimen for 24 h
39、in a ventilated oven at a temperature of70 6 3C (160 6 5F), then cool to room temperature.Determine the flexural strength of each specimen by placingthe specimen on supports that cannot exert longitudinal con-straint (rocker-type bearing edges or rollers with a 3-mm(18-in.) minimum and a 13-mm (12-i
40、n.) maximum radius) andapplying the load equally and simultaneously to both one-thirdpoints of the span through similar edges bearing against eithersurface of the specimen. The test span shall be 609.6 6 1.6 mm(24 6116 in.) and the load lines and supports shall be parallel.Increase the load applied
41、at a uniform rate to produce a failureof the specimen in 1 to 2 min. The possible error in the loadreading shall not exceed 1 % of the load. Report the flexuralstrength as the average load, newtons (or pounds force), for allthe specimens tested.9.2.3.1 Warningsee 1.4.9.3 Vapor Permeability:9.3.1 Sig
42、nificanceThe purpose of this test method is toobtain, by means of simple apparatus, reliable values inuniform units of measurement for the rate of water vaportransmission of insulating and related materials. These valuesare for use in design, manufacture, and marketing. Correlationof test values wit
43、h any given use must be determined byexperience.9.3.2 ProcedureTest asbestos-cement insulating panels inaccordance with Test Methods E 96/E 96M.9.4 Thermal Resistance, R:9.4.1 SignificanceThe thermal resistance, R, of a panel isa measure of the time rate heat flow through a unit area of thepanel in
44、a direction perpendicular to the face of the panel, perunit thickness of the panel, per unit temperature gradient acrossthe panel.9.4.2 ProcedureTest asbestos-cement insulating panels inaccordance with Test Method C 236. Thermal resistance iscalculated as the reciprocal of thermal conductance.9.5 Di
45、mensional Measurements:9.5.1 Significance of Dimensional Measurements:9.5.1.1 SignificanceThese are routine measurements forthe purpose of determining whether the length, width, thick-ness, and squareness of the individual units are as ordered, toensure that they fit together properly in application
46、, and todetermine the uniformity of the specified thickness.9.5.2 ThicknessMeasure each test specimen for thickness,using a micrometer caliper having flat anvils approximately 5mm (0.25 in.) in diameter and reading to 0.02 mm (0.001 in.).Make four measurements on each specimen at the approximatemidp
47、oint of each edge of the specimen, and at least 1 cm (0.5in.) in from the edge. Record average of the four measurementsand record as the specimen thickness.10. Inspection10.1 Inspection of material shall be made at the point ofshipment. The inspector representing the purchaser shall havefree access
48、to the carriers being loaded for shipment to thepurchaser. He shall be afforded all reasonable and availablefacilities at the point of shipment for sampling and inspectionof the material, which shall be so conducted as not to interfereunnecessarily with the loading of the carriers.TABLE 3 Dimensions
49、NominalThicknessNominal Width Nominal Lengthmm (in.) m (in.) m (ft)17 (1116) 1.2 (48) 1.8, 2.4, 2.7, 3.0, 3.6 (6, 8, 9, 10, 12)29 (118) 1.2 (48) 2.4 3.6 (8 12)40 (1916) 1.2 (48) 2.4 3.6 (8 12)51 (2) 1.2 (48) 1.8, 2.4, 2.7, 3.0, 3.6 (6, 8, 9, 10, 12)TABLE 4 Thickness RequirementsNominal Thickness Thickness Limitsmm (in.)minimum maximummm (in.) mm (in.)17 (1116) 16 (0.62) 20 (0.81)29 (118) 27 (1.06) 31 (1.22)40 (1916) 38 (1.50) 42 (1.66)51 (2) 49 (1.94) 52 (2.06)TABLE
