1、Designation: F970 15Standard Test Method forStatic Load Limit1This standard is issued under the fixed designation F970; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parentheses indicates th
2、e year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is intended for use in determining therecovery properties of resilient floor covering after long-termindentation test, 24 h under the load specified in
3、the detailspecification. The reported value, residual indentation, is thedepth of the depression remaining 24 h after removal of thespecified load.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are
4、 provided for information onlyand are not considered standard.1.3 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 and determine the applica
5、-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodF386 Test Method for Thickness of Resilient Flooring Ma-terials Having Flat SurfacesF387 Test Method for Measuring
6、 Thickness of ResilientFloor Covering With Foam LayerF1914 Test Methods for Short-Term Indentation and Re-sidual Indentation of Resilient Floor Covering3. Significance and Use3.1 This test method is a meaningful test for determining theindentation recovery properties of resilient floor covering.33.2
7、 As testing is conducted on uninstalled flooring, resultsare not necessarily an indicator of the floor coverings installedperformance.34. Apparatus4.1 The following apparatus shall be used:4.2 Conditioning Room, providing the standard laboratoryatmosphere of 50 6 5 % relative humidity at a temperatu
8、re of73.4 6 3.6F (23 6 2.0C).4.3 Indentation Machine, as described in Section 12 andpictured in Fig. 2 of Test Method F1914.4.4 Indentor Plates, each constructed of a piece of 2-in.(50.8 mm) square stainless steel, 0.240 6 0.005 in. (6.1 6 0.1mm) thick, with one side turned to 1.125 in. (28.6 mm) in
9、diameter (one square inch area) to depth of 0.150 in. (3.8 mm)(see Fig. 1).4.5 Dial Micrometer, as described in Test Method F386when measuring resilient floor coverings containing a foamlayer as part of the construction or as described in Test MethodF387 when measuring all other resilient floor cove
10、rings.4.6 Template of Poly(methyl Methacrylate) (PMMA), or ofother transparent material, 2 by 2 in. (50.8 by 50.8 mm) withround scratch line centered on the template that is 1.125 in.(28.58 mm) in diameter, defining the test area, and with a12 in.(12.7 mm) diameter hole at the center of the template
11、 to drawa circle on the specimen where thickness will be measured.4.7 Die, 2 by 2 in. (50.8 by 50.8 mm) and press, papercutter,or equivalent to cut specimens to 2 by 2 in. size (50.8 by 50.8mm).4.8 OptionalOpen box without spring clips for 2 by 2 in.(50.8 by 50.8 mm) photographic slides, or equivale
12、nt, toseparate specimens during conditioning and recovery periods.5. Sampling, Test Specimens and Test Units5.1 The specimens shall be 2 by 2 in. (50.8 by 50.8 mm).The test unit shall consist of three specimens.5.2 The central one square inch test area of each specimenshould be free of mortar lines
13、or other embossing lines, ifpossible. If not possible, the largest flat, raised area should becentered on the specimen.1This test method is under the jurisdiction ofASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.30 on TestMethods - Performance.Cur
14、rent edition approved Dec. 1, 2015. Published January 2016. Originallyapproved in 1987. Last previous edition approved in 2011 as F97007 (2011). DOI:10.1520/F097015.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Bo
15、ok of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3For additional information, see Resilient Floor Covering Institute (RFCI)document, Static Limit Testing of Resilient Flooring Products, available from RFCI,115 Broad Street, Suite 201, La Grange,
16、 GA 30240, .Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.3 If the sample is nubble embossed, the specimen shouldbe cut so that a nub is at the center of the specimen where thespecimen will be measured.5.4 A circle slightly larger
17、 than the 0.250 in. (6.35 mm)diameter foot of the thickness gauge (4.5) is drawn on the wearlayer at the center of the specimen, using the PMMA template(4.6), to ensure that thickness measurements are made at thesame spot.6. Conditioning6.1 Condition the test unit at least 16 h at 73.4 6 3.6F(23.0 6
18、 2.0C) and 50 6 5 % relative humidity and test in thesame environment.7. Procedures7.1 Measure the initial thickness of each specimen, wearlayer up, at the center of the specimen using the dial microm-eter. Record the value to the nearest 0.001 in. (0.025 mm) as T1.7.2 Place the 2 by 2 in. (50.8 by
19、50.8 mm) indentor plate ontop of the 2 by 2 in. (50.8 by 50.8 mm) specimen with the 1.125in. (28.58 mm) diameter surface flat against the wear layer ofthe specimen.7.3 Stack the remaining specimens and indentor plates asshown in Fig. 2. Place as many specimen/indentor plate setsunder the indentation
20、 machine plunger as will fit.7.4 Square the stack of specimen/indentor plate sets andthen center the stack under the plunger of the indentationmachine.7.5 Check all clearances to be sure that the plunger andmajor load shaft with weight platform and weights will be freeto move down without restrictio
21、n as the height of the stack ofspecimens diminishes during test. If necessary, place a metalspacer above or below the plunger, and adjust the position ofthe collar on the plunger that supports a dial indicator (not usedfor static load test) to ensure adequate clearances during test.7.6 Apply the loa
22、d according to the detail specification (75,125, 175, or 250 lb) by lowering gently, without impact.7.7 Remove the load after 24 6 0.25 h and separate thespecimens from the indentor plates. Place the specimensindividually on a horizontal surface with the wear layer up oron edge in a slide box to rec
23、over .7.8 Allow specimens to recover for 24 6 0.25 h. Measurethe final thickness at the same point used to determine initialthickness. Record the value to the nearest 0.001 in (0.025 mm)as T2.8. Calculation8.1 Calculate the residual indentation for each specimen asfollows:Residual indentation 5 T12
24、T2(1)where:T1= initial thickness of uncompressed specimens, andT2= thickness of the specimen after the 24 h recoveryperiod.9. Report9.1 Report the following information:9.1.1 Complete identification of the product tested includingtype, source and manufacturers reference numbers,9.1.2 The applied loa
25、d,9.1.3 The residual indentation for each specimen, and9.1.4 The average residual indentation.10. Precision and Bias410.1 Precision Statement for Test Method: 75 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for the materials tobe:Materials Avera
26、ge Sr SR r RMaterial A 1.2900 0.4606 0.7244 1.2897 2.0283Material B 1.8383 0.7251 0.9941 2.0302 2.7835Material C 2.5400 0.6315 1.6225 1.7683 4.5431Material D 0.7817 0.3405 1.2443 0.9533 3.4841Material E 1.0283 0.4295 0.5103 1.2027 1.4289Material F 1.2583 0.3515 0.8906 0.9842 2.4938Material G 1.1517
27、0.3130 0.5485 0.8765 1.5357Material H 0.8050 0.4396 0.7639 1.2309 2.13894Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F06-1005.NOTE 1All dimensions are in inches. Tolerance is 60.005 in. (60.1mm).Metric Equivalents:Inches Mill
28、imetres2.000 50.81.125 28.60.240 6.10.150 3.80.090 2.3FIG. 1 Indentor Plates for Static Load Limit TestFIG. 2 Test Specimen Stacking ProcedureF970 15210.2 Precision Statement for Test Method: 125 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for
29、the materials tobe:Materials Average Sr SR r RMaterial A 1.5650 0.4410 0.6230 1.2347 1.7444Material B 2.4700 0.7770 0.9865 2.1755 2.7621Material C 3.6150 0.5257 1.5327 1.4719 4.2916Material D 0.9133 0.3177 1.1233 0.8897 3.1453Material E 1.2967 0.3782 1.3130 1.0590 3.6765Material F 2.0967 0.6213 1.14
30、58 1.7395 3.2082Material G 1.2500 0.4299 0.6220 1.2036 1.7415Material H 0.8867 0.3490 0.8310 0.9772 2.326710.3 Precision Statement for Test Method: 175 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for the materials tobe:Materials Average Sr SR r
31、 RMaterial A 2.3050 0.4881 0.5336 1.3667 1.4941Material B 2.9000 0.8636 0.9125 2.4181 2.5550Material C 4.5833 0.8461 1.7083 2.3690 4.7833Material D 0.7817 0.5179 0.9264 1.4501 2.5939Material E 1.3067 0.5465 0.7144 1.5301 2.0003Material F 3.0000 0.6880 1.2707 1.9264 3.5579Material G 1.2733 0.3723 0.5
32、720 1.0425 1.6016Material H 1.2317 0.4331 0.6054 0.2127 1.695110.4 Precision Statement for Test Method: 250 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for the materials tobe:Materials Average Sr SR r RMaterial A 3.4117 0.6008 2.1059 1.6822 5.8
33、965Material B 3.4600 0.8773 1.8846 2.4565 5.2769Material C 6.9933 0.7898 5.4767 2.2115 15.3348Material D 0.5700 0.5293 0.6072 1.4820 1.7002Material E 2.1433 0.4278 1.9323 1.1978 5.4104Material F 4.7667 0.6069 2.3446 1.6993 6.5650Material G 3.1017 0.5088 1.7970 1.4245 5.0315Material H 1.8033 0.5975 0
34、.7532 1.6730 2.108910.5 Material Identification:Material AType I, Grade 3 Floor CoveringMaterial BType I, Grade 3 Floor Covering High Blow Ratio FoamLayerMaterial CType I, Grade 3 Double Felt, Double Foam, Wear Layer/Compact CoatMaterial DType II, Grade 1 Homogeneous Commercial FloorCoveringMaterial
35、 EType I, Grade 1, Floor Covering with Urethane Top CoatMaterial FType I, Grade 1 Floor CoveringMaterial GType I, Grade 2 Floor CoveringMaterial HType II, Grade 1 Floor Covering10.6 In the tables in 10.1 10.4, for the materials indicated:average = numerical average of test resultsfor all replicates
36、from alllaboratories,Sr = within-laboratory standard devia-tion of the average,r = 2.83 Sr,SR = between-laboratory standard de-viation of the average,R = 2.83 SR,repeatability (Sr, r) = in comparing two average valuesfor the same material obtained bythe same operator using the sameequipment on the s
37、ame day, themeans should be judged notequivalent if they differ by morethan the r value for that materialand condition, andreproducibility (SR, R) = in comparing two average valuesfor the same material obtained bydifferent operators using differentequipment on different days, themeans should be judg
38、ed notequivalent if they differ by morethan the R value for that materialand condition. (This applies be-tween different laboratories or be-tween different equipment withinthe same laboratory.)These judgments will have an approximate 0.95 (95 %)probability of being correct. Other materials may give
39、some-what different results. For further information on the method-ology used in Section 10, consult Practice E691.11. Keywords11.1 flooring; recovery; residual indentation; resilient; staticloadASTM International takes no position respecting the validity of any patent rights asserted in connection
40、with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible te
41、chnical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consider
42、ation at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr
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