1、Designation: F 970 07Standard Test Method forStatic Load Limit1This standard is issued under the fixed designation F 970; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates
2、the year of last reapproval. Asuperscript epsilon (e) 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
3、in the detailspecification. The reported value, residual indentation, is thedepth of the depression remaining 24 h after removal of thespecified load.1.2 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
4、standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 171 Specification for Atmospheres for Conditioning andTesting Flexible Barrier MaterialsE 691 Practice for Conducting an
5、 Interlaboratory Study toDetermine the Precision of a Test MethodF 386 Test Method for Thickness of Resilient FlooringMaterials Having Flat SurfacesF 387 Test Method for Measuring Thickness of ResilientFloor Covering With Foam LayerF 1914 Test Methods for Short-Term Indentation and Re-sidual Indenta
6、tion 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 As testing is conducted on uninstalled flooring, resultsare not necessarily an indicator of the floor coverings install
7、edperformance.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 temperature 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 F
8、1914.4.4 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) indiameter (one square inch area) to depth of 0.150 in. (3.8 mm)(see Fig. 1).4.5 Dial Micrometer, as described in Test Me
9、thod F 386when measuring resilient floor coverings containing a foamlayer as part of the construction or as described in Test MethodF 387 when measuring all other resilient floor coverings.4.6 Template of Poly(methyl Methacrylate) (PMMA), or ofother transparent material, 2 by 2 in. (50.8 by 50.8 mm)
10、 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 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, pa
11、percutter,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 equivalent, toseparate specimens during conditioning and recovery periods.5. Sampling, Test Specimens and Test Units5.1 The s
12、pecimens 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 or other embossing lines, ifpossible. If not possible, the largest flat, raised area should becentered on the specime
13、n.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.Current edition approved Oct. 1, 2007. Published October 2007. Originallyapproved in 1987. Last previous edition approve
14、d in 2006 as F 97006.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3For additional information, see Resilie
15、nt Floor Covering Institute (RFCI)document, Static Limit Testing of Resilient Flooring Products, available from RFCI,401 E. Jefferson, Suite 102, Rockville, MD 20850, 1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 If the sample
16、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 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
17、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 2.0C) and 50 6 5 % relative humidity and test in thesame environment (see Specification E 171).7. Procedures7.1 Measure the initial thickness o
18、f each specimen, wearlayer up, at the center of the specimen using the dial microme-ter. 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 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 surfa
19、ce 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 machine plunger as will fit.7.4 Square the stack of specimen/indentor plate sets andthen center the stack under the p
20、lunger 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 restriction as the height of the stack ofspecimens diminishes during test. If necessary, place a metalspacer above or below the
21、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 load according to the detail specification (75,125, 175, or 250 lb) by lowering gently, without impact.7.7 Remove the loa
22、d 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 recover .7.8 Allow specimens to recover for 24 6 0.25 h. Measurethe final thickness at the same point used to determine i
23、nitialthickness. 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 T2(1)where:T1= initial thickness of uncompressed specimens, andT2= thickness of the specimen after the 24 h recoverype
24、riod.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 load,9.1.3 The residual indentation for each specimen, and9.1.4 The average residual indentation.10. Precision and Bias41
25、0.1 Precision Statement for Test Method: 75 psiPrecision, characterized by repeatability, Sr, r, and reproduc-ibility, SR, R, has been determined for the materials to be:Materials Average 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.
26、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 0.3130 0.5485 0.8765 1.5357Material H 0.8050 0.4396 0.7639 1.2309 2.138910.2 Precision Statement for Test Method: 1
27、25 psiPrecision, characterized by repeatability, Sr, r, and reproduc-ibility, SR, R, has been determined for the materials to be:4Supporting data have been filed atASTM Headquarters and may be obtained byrequesting Research Report: RRF06-1005.NOTEAll dimensions are in inches. Tolerance is 60.005 in.
28、 (60.1mm).Metric Equivalents:Inches Millimetres2.000 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 ProcedureF970072Materials 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
29、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 1.1458 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
30、 for Test Method: 175 psiPrecision, characterized by repeatability, Sr, r, and reproduc-ibility, SR, R, has been determined for the materials to be:Materials Average Sr SR r 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 2.3
31、690 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 0.5720 1.0425 1.6016Material H 1.2317 0.4331 0.6054 0.2127 1.695110.4 Precision Statement for Test Method: 250 psiPrecision, chara
32、cterized by repeatability, Sr, r, and reproduc-ibility, SR, R, has been determined for the materials to be:Materials Average Sr SR r RMaterial A 3.4117 0.6008 2.1059 1.6822 5.8965Material 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 0.607
33、2 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 0.7532 1.6730 2.108910.5 Material Identification:Material AType I, Grade 3 Floor CoveringMaterial BType I, Grade 3 Floor Cove
34、ring High Blow Ratio Foam LayerMaterial CType I, Grade 3 Double Felt, Double Foam, Wear Layer/CompactCoatMaterial DType II, Grade 1 Homogeneous Commercial Floor CoveringMaterial EType I, Grade 1, Floor Covering with Urethane Top CoatMaterial FType I, Grade 1 Floor CoveringMaterial GType I, Grade 2 F
35、loor 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 from all labora-tories,Sr = within-laboratory standard de-viation of the average,r = 2.83 Sr,SR = between-laboratory standa
36、rd 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 same day, themeans should be judged notequivalent if they differ by morethan the r value for that materialand condition, a
37、ndreproducibility (SR, R) = in comparing two average valuesfor the same material obtained bydifferent operators using differ-ent equipment on different days,the means should be judged notequivalent if they differ by morethan the R value for that materialand condition. (This applies be-tween differen
38、t laboratories orbetween different equipmentwithin the same laboratory.)These judgments will have an approximate 0.95 (95 %) prob-ability of being correct. Other materials may give somewhatdifferent results. For further information on the methodologyused in Section 10, consult Practice E 691.11. Key
39、words11.1 flooring; recovery; residual indentation; resilient; staticloadASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity o
40、f 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 technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments a
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42、ceived 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 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F970073
