1、Designation: C 473 07Standard Test Methods forPhysical Testing of Gypsum Panel Products1This standard is issued under the fixed designation C 473; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、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 These test methods cover the physical testing of gypsumpanel products.1.2 The test methods appear in the following order:SectionFlexural Str
3、ength (Method A) 7Core, End and Edge Hardness (Method A) 8Nail Pull Resistance (Method A) 9Flexural Strength (Method B) 11Core, End and Edge Hardness (Method B) 12Nail Pull Resistance (Method B) 13Humidified Deflection 14End Squareness 15Nominal Thickness 16Recessed- or Tapered Edge Depth 17Width 18
4、Length 19Water Resistance of Core-Treated Water-RepellentGypsum Panel Products 20Surface Water Resistance of Gypsum Panel Productswith Water-Repellent Surfaces 211.3 The text of these test methods references notes andfootnotes that provide explanatory material. These notes andfootnotes, excluding th
5、ose in tables and figures, shall not beconsidered as requirements of these test methods.1.4 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 and health practices
6、 and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related Build-ing Materials and SystemsD 3285 Test Method for Water Absorptiveness of Nonbibu-lous Paper and Paperboard (Cobb Test)E4 Practices f
7、or Force Verification of Testing Machines3. Terminology3.1 Definitions used in these test methods are in accordancewith Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 edge, nthe paper-bound edge, or long edge, asmanufactured.3.2.2 ends, nthe end perpendicular to the paper-b
8、oundedge or long edge.4. Sampling4.1 For use in these test methods, a sample shall consist ofnot less than 0.25 % of the number of gypsum panel productsin a shipment, but not less than three gypsum panel products.Test specimens shall be taken from the sample lot as indicatedin each method.5. Conditi
9、oning5.1 Condition specimens to constant weight at a temperatureof 85 6 15 F (29.5 6 8.5 C) and relative humidity of 50 62% (Note 1). Test specimens individually after constantweight is reached and within 10 min upon removal from theconditioning chamber.NOTE 1Laboratory test results indicated that c
10、onditioning tempera-tures may range from 70 to 100 F (21 to 38 C) without significantlyaffecting the results. However, relative humidity is critical. This is thereason for testing specimens within 10 min upon removal from theconditioning chamber.Method AConstant Rate of LoadingINTRODUCTIONThe follow
11、ing procedures are applicable to so-called “shotmachines” that utilize lead or steel shot that applies a load tothe specimen at a constant stress rate or any other device thatapplies the load at a constant stress rate.6. ApparatusMethod A6.1 Testing MachineApply the test load at a uniform rateof 1 l
12、bf/s (4.45 N/s) 610 %. Apply the load with a device1These test methods are under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and are the direct responsi-bility of Subcommittee C11.01 on Specifications and Test Methods for GypsumProducts.Current edition
13、approved July 1, 2007. Published July 2007. Originally approvedin 1961. Last previous edition approved in 2006 as C 473 06a.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, r
14、efer to the standards Document Summary page onthe ASTM website.1*A Summary 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.independent of manual control of the rate of loading dur
15、ing anindividual sample test (see Fig. 1). The deformation of thespecimen controls the cross head speed.7. Flexural Strength (Method A)7.1 Summary of Test MethodFlexural properties of gyp-sum panel products are evaluated by supporting the specimennear the ends and applying a transverse load midway b
16、etweenthe supports.7.2 Significance and UseThis test method covers a pro-cedure for evaluating the ability of gypsum panel products towithstand flexural stresses during handling or use of thematerial. This test method is used to determine compliancewith gypsum panel product specifications. The degre
17、e ofcorrelation between this test and service performance has notbeen fully determined.7.3 ApparatusSee Section 6.1.7.3.1 Specimen SupportsAll specimen bearing supportsand load surfaces shall be true, shall engage the full width ofthe test specimen, shall be of such strength they will notdeform unde
18、r the test load, and shall be rounded to a radius of0.125 in. (3.2 mm). The specimen supports shall be spaced 146 0.016 in. (356 6 0.41 mm) on centers measured at the pointsof surface contact with the specimen. The supports shall beattached to a plate that shall be rigidly attached to the testappara
19、tus. The supports shall be parallel to each other andperpendicular to the long dimension of the test specimen. Thebearing surface of the end supports shall be on the same planeto ensure contact along the entire bearing surfaces. Supportsshall be not less than 12 in. (305 mm) in length. When a loadis
20、 being applied, the loading bar shall be in contact with the fullwidth of the specimen. The load-bearing surface shall beparallel to the bearing surface of the specimen supports. Thespecimen and supports shall be located so that the vertical axisthrough the center of the load-bearing surface passes
21、throughthe specimen at one half of the specimen width and one half ofthe distance between the supports.7.4 SamplingSampling shall be in accordance with Sec-tion 4.7.5 Test Specimens:7.5.1 Cut four specimens, each 12 in. (305 mm) by approxi-mately 16 in. (406 mm) from each gypsum panel product in the
22、sample, two having the 16-in. dimension parallel to the edgeand two having the 16-in. dimension perpendicular to the edge.Cut the specimens not less than 4 in. (102 mm) away from theends and edges of the gypsum panel product except where theproduct is 24-in. or less in width, where it is impossible
23、to doso.7.5.2 Condition specimens in accordance with Section 5.7.6 Procedure:7.6.1 Use the apparatus in 7.3, supporting each specimencentrally on the fixed parallel bearings, 14-in. (356 mm) oncenters, and apply the load on a similar bearing midwaybetween the supports. Position perforated gypsum lat
24、h so theload is not applied over perforations.7.6.2 For specimens with the long dimension parallel to theedge, test one specimen from each gypsum panel product faceup and the other face down. For specimens with the longdimension perpendicular to the edge, test one specimen fromeach gypsum panel prod
25、uct face up and the other face down.7.6.3 For gypsum panel products with surfacing material,the load is determined at the time of transverse failure of thesurfacing material and core through the thickness of thespecimen. The specimens shall not show a break in the bondbetween the surfacing and the c
26、ore before transverse failure ofthe gypsum panel product. If a single specimen fails, test twoadditional specimens from the same sample, and, if either oneof the two specimen fail, the sample has failed. For gypsumpanel products without surfacing material, the load is deter-mined at the time of tran
27、sverse failure through the thickness ofthe specimen.7.7 ReportCalculate and report the average breaking loadin pound-force or newtons for each test condition, rounded tothe nearest 1 lbf (N). The test conditions are: (1) parallel, faceup; (2) parallel, face down; (3) perpendicular, face up; and, (4)
28、perpendicular, face down.7.8 Precision and BiasThe precision and bias for this testmethod has not been determined.8. Core, End, and Edge Hardness (Method A)8.1 Summary of Test MethodThe core, end, and edgehardness of gypsum panel products is evaluated by determiningthe force required to push a steel
29、 punch into the area of test.8.2 Significance and UseThis test method covers a pro-cedure for evaluating the ability of the gypsum panel productcore, ends, and edges to resist crushing during handling or useof the material. This test method is used to determine compli-ance with gypsum panel product
30、specifications. The degree ofcorrelation between these test methods and service perfor-mance has not been determined.8.3 ApparatusSee 6.1. Clamp or secure the specimen tothe base of the test apparatus shown in Fig. 1 with the face ofthe specimen perpendicular to the base of the test apparatus andpar
31、allel to the movement of the steel punch. Secure the steelpunch to the moving head of the test apparatus, positioned sothat its center axis is parallel with the line of travel and so thatthe punch is inserted into the core equidistant from the surfacesof the specimen. Use a steel punch 0.099 6 0.003
32、 in. (2.515 60.076 mm) in diameter and more than12 in. (12.7 mm) longwith the bearing surface machined to a 90 angle in referenceto the punch center line (see Fig. 1 for test setup schematic).8.4 SamplingSampling shall be in accordance with Sec-tion 4.8.5 Test Specimens:FIG. 1 Apparatus Schematic fo
33、r Core, End, and Edge HardnessTestC4730728.5.1 Specimens for Core HardnessUsing a table or bandsaw, cut one specimen from the center of each gypsum panelproduct sample approximately 12 by not less than 3 in. (305 by76 mm), with the 12-in. dimension perpendicular to the edgesof the products. The smal
34、ler, not less than 3 in., dimension willvary depending on the specific punch length and opening in thetesting machines. Place the sample in the tester, with theloading arm in a horizontal position and with the punch restingon the specimen. Saw cuts along the 12-in. dimension shall besmooth and squar
35、e with the smaller (not less than 3-in.)dimension, as well as with the specimen.8.5.2 Specimens for End HardnessCut specimens thesame size and method as described in 8.5.1 from one mill-cutend of the gypsum panel product, with the 12-in. (305-mm)dimension perpendicular to the edges and run tests onl
36、y on themill-cut end of the specimens.8.5.3 Specimens for Edge HardnessCut specimens thesame size and method as described in 8.5.1 from the oppositeedges of each gypsum panel product, with the 12 in. (305 mm)dimension of the specimens parallel with the edges. Forgypsum panel products with surfacing
37、material, cut a14 to12-in. (6 to 13-mm) strip of surfacing material from the edge ofthe test specimens exposing the core for test. Remove as littleof the core as possible when removing the surfacing material.Prepare the first test area 2 612 in. (51 6 13 mm) from oneedge of the specimen, with the ne
38、xt two test areas approxi-mately 4 in. (102 mm) apart.8.5.4 Condition specimens in accordance with Section 5.8.6 ProcedureUsing the apparatus in 8.3, clamp or securethe specimen in a fixed vertical position on its 12 in. (305 mm)dimension edge (see Fig. 1 for test setup schematic. Ifnecessary, modif
39、y the flexural strength test equipment toconduct the core, end, and edge hardness test). Place this testsurface not less than 1 in. (25 mm) above the grip of thespecimen holder. Conduct three tests spaced approximately 4in. (102 mm) apart on each specimen, with the first test area 2612 in. (51 6 13
40、mm) from one edge of the specimen.Position the steel punch over the test area and apply the load.Report as the core, end, or edge hardness the load required topush the steel punch a distance of12 in. (13 mm) into the coreof the specimen.8.6.1 Procedure for Core HardnessTest in 3 locations oneither o
41、f the 12-in. (305-mm) saw cut edges of each specimen.8.6.2 Procedure for End HardnessTest in 3 locations onthe 12-in. (305-mm) mill-cut end of each specimen.8.6.3 Procedure for Edge HardnessTest in 3 locationsalong each of the two 12-in. (305-mm) edges. For productswith surfacing material, test wher
42、e the surfacing material hasbeen removed.8.7 ReportReport the core, end, and edge hardness indi-vidually as the average load in pounds-force or newtonsrounded to the nearest 1 lbf (N). Discard any single test valuethat varies from the average by more than 15 % and repeat thetest on the same sample t
43、o obtain a new value.8.8 Precision and BiasThe precision and bias of this testmethod has not been determined.9. Nail Pull Resistance (Method A)9.1 Summary of Test MethodThe ability of gypsum panelproducts to resist nail pull-through is evaluated by determiningthe load required to push a standard nai
44、l head through theproduct.9.2 Significance and UseThis test method covers a pro-cedure for evaluating the ability of gypsum panel products toresist nail pull-through by determining the load required toforce a standard nail head through the product. This testmethod is used to determine compliance wit
45、h gypsum panelproduct specifications. The degree of correlation between thesetest methods and service performance has not been determined.9.3 ApparatusSee 6.1. This apparatus shall be used witheither of the specimen support plates in 9.3.1 or 9.3.2.9.3.1 Fig. 2 shows a schematic of a nail pull resis
46、tanceapparatus adaptable to a typical flexural strength apparatuscommonly used in the gypsum industry. The specimen supportplate shall have a 3-in. (76-mm) diameter hole in the center.The support plate shall be not less than 6 by 6 in. (152 by 152mm). It shall be attached to the apparatus as necessa
47、ry tomaintain the surface of the plate perpendicular to the travel ofthe test nail. The support plate must also be located so that thevertical axis through the center of the nail shank passes throughthe center of the hole in the support plate. The test nail shankshall be 0.099 6 0.003 in. (2.515 6 0
48、.076 mm) in diameter andthe nail head shall be 0.2506 0.005 in. (6.350 6 0.127 mm) indiameter. The nail shall be attached at the head to the movablecross head of the test apparatus. This attachment shall notexceed the diameter of the nail head and shall be placeddirectly over the head. It shall also
49、 be attached so that thevertical axis through the nail shank is parallel with the travel.9.3.2 Fig. 3 shows a schematic of an alternate nail pullresistance apparatus adaptable to a typical flexural strengthapparatus commonly used in the gypsum industry. This appa-ratus mirrors all of the requirements of 9.3.1, except that thenail is not attached at the head to the movable cross head of thetest apparatus. The alternate apparatus utilizes a machinedplunger with the nail head and shank incorporated as anintegral part of the plunger. The plunger fit
