1、Designation: C 551 98 (Reapproved 2003)e1Standard 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
2、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.This standard has been approved for use by agencies of the Department of Defense.e1NOTEAsbestos warning was moved from 9.2.3.1 to
3、 1.4 in September 2004.1. Scope1.1 This specification covers asbestos-cement insulatingpanels 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, par
4、titions, curtain walls, roof decks,and for decorative purposes.1.2 All measurements and tests 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 re
5、garded as thestandard. The values stated in parentheses are provided forinformation only.1.4 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
6、working with asbestos-cement products, minimize the dust that results. For informa-tion on 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, Sec
7、tion 9, 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 regulatory limita-tions prio
8、r to use. See 1.4 for a specific hazard warning.2. Referenced Documents2.1 ASTM Standards:3C 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 Build
9、ing Assemblies by Means of a Guarded Hot Box4C 458 Test Method for Organic Fiber Content of Asbestos-Cement ProductsC 518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC 595M Specification for Blended Hydraulic Cements5C 618 Specification for Co
10、al Fly Ash and Raw or CalcinedNatural Pozzolan for Use as a Mineral Admixture inPortland Cement ConcreteD 2946 Terminology for Asbestos and Asbestos-CementProductsE 96 Test Methods for Water Vapor Transmission of Mate-rials2.2 Federal Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)6
11、2.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage62.4 Other Standards:Uniform Freight Classification Rules7National Motor Freight Classification Rules81This specification is under the jurisdiction of ASTM Committee C17 onFiber-Cement Products and is the direct responsibility of Subc
12、ommittee C17.03 onAsbestos-Cement Products.Current edition approved Jan. 10, 2003. Published July 2003. Originallyapproved in 1964. Last previous edition approved in 1998 as C 551 98.2Available from The Asbestos Institute, http:/ referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
13、tact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Withdrawn.5Withdrawn.6Available from Standardization Documents, Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111
14、-5094.7Available from the Uniform Classification Commission, Room 1106, 222 S.Riverside Plaza, Chicago, IL 60606.8Available from National Motor Freight Inc., 1616 “P” St. NW, Washington, DC20036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unit
15、ed States.3. 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 average breaking load in new-ton
16、s 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 capacityin Nm/m (or ftlbf/ft) of width, obtained fr
17、om the product of flexuralstrength and span divided by 6.3.1.3 lotshipment, or part thereof, 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. P
18、anels with perfect squareness have zero differencebetween the length of their diagonals.3.1.5 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
19、 sheets of asbestos-cement. The insulating core shall bemanufactured from wood, fiber, or other 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
20、 as to effect complete destruction of rot producingfungi. The asbestos-cement facing boards shall be composed ofa combination of asbestos fiber and portland cement prescribedin Specification C 150, or portland slag or pozzolan cementsmeeting Specification C 595M, with or without the addition ofcurin
21、g agents or additives meeting Specification C 618, water-repellent substances, mineral fillers, 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-
22、ponents as determined by Test Method C 458. The bondingadhesive shall cover essentially 100 % 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
23、.1.2 The insulating core board shall conform to the require-ments for Class C or E of Specification 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) sha
24、ll not be less than shown in Table 1.5.1.4 Vapor PermeabilityThe average vapor permeabilityof any panel board thickness shall not exceed 0.35g/MPa.s.m2(6 perms, or grains of water vapor per square footper hour per inch mercury vapor pressure differential) whentested according to the wet cup method o
25、f Test Methods E 96.5.1.5 Thermal Resistance, RThe average thermal resis-tance, R, Km2/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 u
26、se and have such adhesion that specimens resist theshear stress generated during flexural 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.
27、2 Permissible Variation in Dimensions:5.2.2.1 ThicknessThe average thickness of all panelssupplied 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 perm
28、issible variation fromthe nominal width shall be 3 mm (0.12 in.) and +1.5 mm(0.06 in.) 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 w
29、idth or length.6. Supplementary and Finishing Pieces, Accessories6.1 Fasteners of suitable 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 i
30、nformationregarding the supporting structure must be supplied by thepurchaser.7. Workmanship, 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 sh
31、all be smooth,grained, granuled-coated, or otherwise textured.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 R Value at 24C (70
32、F)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)C 551 98 (2003)e127.3 ColorBoth surfaces of the panel will be the naturalcolor of the asbestos-cement products or may be colored by theaddition of mineral pigments, chemical impregnation, pig-m
33、ented coatings, veneers, or embedded mineral granules.7.4 EfflorescenceEfflorescence that sometimes may ap-pear on asbestos-cement insulating panels 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
34、therequirements of this specification, a second sample from thesame lot shall be prepared and tested. The results of the retestshall be averaged with the results of the original test todetermine compliance with this specification.8.2 Failure to conform to any one of the requirements of thisspecifica
35、tion, upon retest as prescribed above, shall constitutegrounds for rejection. In case of rejection, 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 wi
36、thin 20days after receipt of written notice of the specific cause forrejection.9. Test Methods9.1 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
37、.9.1.2 Additional panels may be taken at the discretion of theinspector.9.2 Flexural Strength:9.2.1 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 a
38、pplied equally and simultaneouslyto both one-third points of the span, and tested by the methodprescribed 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 lon
39、g dimension ofthe samples parallel to the long dimension of the panel. Dryeach specimen for 24 h 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 longitudina
40、l con-straint (rocker-type bearing edges or rollers with a 3-mm(18-in.) minimum and a 13-mm (12-in.) 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
41、 1.6 mm(24 6116 in.) and the load lines and supports shall be parallel.Increase the load applied 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 p
42、ounds force), for allthe specimens tested.9.2.3.1 Warningsee 1.4.9.3 Vapor Permeability:9.3.1 SignificanceThe 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 materi
43、als. These valuesare for use in design, manufacture, and marketing. Correlationof test values with any given use must be determined byexperience.9.3.2 ProcedureTest asbestos-cement insulating panels inaccordance with Test Methods E 96.9.4 Thermal Resistance, R:9.4.1 SignificanceThe thermal resistanc
44、e, R, of a panel isa measure of the time rate heat flow through a unit area of thepanel in 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 Me
45、thod C 236. Thermal resistance iscalculated as the reciprocal of thermal conductance.9.5 Dimensional 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 t
46、he individual units are as ordered, toensure that they fit together properly in application, 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 re
47、ading to 0.02 mm (0.001 in.).Make four measurements on each specimen at the approximateTABLE 3 DimensionsNominalThicknessNominal 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
48、(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 5 Sample Panel Selection
49、Quantity of Panels in a Lot Quantity of Panels Selected as Samples500 and under 3501 to 1000 51001 to 1728 61729 to 2744 72745 to 4096 84097 to 5832 95833 to 8000 10C 551 98 (2003)e13midpoint 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 s
