1、Designation: F970 17Standard Test Method forMeasuring Recovery Properties of Floor Coverings afterStatic Loading1This 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
2、last revision. A number in parentheses indicates the 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 uninstalled resilient floor covering aft
3、erlong-term indentation test, 24 h under the load specified in thedetail specification. The reported value, residual indentation, isthe depth of the depression remaining 24 h after removal of thespecified load.1.2 This test method is not intended for use in evaluating thelong-term indentation resist
4、ance or recovery properties, orboth, of resilient floor coverings at loads above those listed inthe Precision and Bias statement as described in Section 10.1.2.1 Testing at loads above 250 psi is outside the scope ofthis test method.1.3 The values stated in inch-pound units are to be regardedas stan
5、dard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 st
6、andard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles f
7、or theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodF386
8、Test Method for Thickness of Resilient Flooring Ma-terials Having Flat SurfacesF387 Test Method for Measuring 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 me
9、thod is a meaningful test for determining theindentation recovery properties of uninstalled resilient floorcovering.33.2 This test method is intended solely for the purpose ofdetermining compliance, where applicable, with static loadrequirements set forth in resilient flooring product specifica-tion
10、s under the jurisdiction of ASTM Committee F06 onResilient Floor Coverings.3.3 As testing is conducted on uninstalled flooring, resultsare not an indicator of the floor coverings installed perfor-mance.34. Apparatus4.1 The following apparatus shall be used:4.2 Conditioning Room, providing the standa
11、rd 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 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.
12、 (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 Method F386when measuring resilient floor coverings containing a foam1This test method is under the jurisdiction of
13、ASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.30 on TestMethods - Performance.Current edition approved May 1, 2017. Published May 2017. Originallyapproved in 1987. Last previous edition approved in 2015 as F97015. DOI:10.1520/F097017.2For referen
14、ced 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 Resilient Floor Covering Institute (RFCI
15、)document, Static Limit Testing of Resilient Flooring Products, available from RFCI,115 Broad Street, Suite 201, La Grange, GA 30240, .Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accorda
16、nce with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1layer as part of the construction
17、or as described in Test MethodF387 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) withround scratch line centered on the template that is 1.125 in.(28.58 mm) in diameter, defining the
18、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, papercutter,or equivalent to cut specimens to 2 by 2 in. size (50.8 by 50.8mm).4.8 OptionalOpen box witho
19、ut 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 specimens shall be 2 by 2 in. (50.8 by 50.8 mm).The test unit shall consist of three specimens.5.2 The c
20、entral 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 specimen.5.3 If the sample is nubble embossed, the specimen shouldbe cut so that a nub is at the center of the
21、 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 template(4.6), to ensure that thickness measurements are made at thesame spot.6. Co
22、nditioning6.1 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.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
23、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 surface flat against the wear layer ofthe specimen.7.3 Stack the remaining specimens and indentor plates asshown i
24、n 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 plunger of the indentationmachine.7.5 Check all clearances to be sure that the plunger andmajor load shaft wit
25、h 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 plunger, and adjust the position ofthe collar on the plunger that supports a dial indicator (not usedfor stat
26、ic 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 load after 24 6 0.25 h and separate thespecimens from the indentor plates. Place the specimensindividually on a
27、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 initialthickness. Record the value to the nearest 0.001 in (0.025 mm)as T2.8. Calculation8.1 Calculate the res
28、idual 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 recoveryperiod.NOTE 1All dimensions are in inches. Tolerance is 60.005 in. (60.1mm).Metric Equivalents:Inches Millimetr
29、es2.000 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 1729. Report9.1 Report the following information:9.1.1 Complete identification of the product tested includingtype, source and manufacturers reference numbers
30、,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 Bias410.1 Precision Statement for Test Method: 75 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for the material
31、s tobe: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 2.5400 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.
32、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: 125 psiPrecision, characterized by repeatability, Sr, r, andreproducibility, SR, R, has been determined for the materials tobe:Materials Average Sr SR r RMaterial A
33、 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 1.1458 1.7395 3.2082Material G 1.2500 0.4299 0.6220 1.2036 1
34、.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 RMaterial A 2.3050 0.4881 0.5336 1.3667 1.4941Material
35、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 0.5720 1.0425 1.6016Material H 1.2317 0.4331 0.6054 0.2127
36、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 5.8965Material B 3.4600 0.8773 1.8846 2.4565 5.2769Material
37、 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 0.7532 1.6730 2.108910.5 Material Identification:Material
38、 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 EType I, Grade 1, Floor Covering with Urethane Top Coat
39、Material 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 from alllaboratories,Sr = within-laboratory standard dev
40、ia-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 same day, themeans should be judged notequivalent if they
41、 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 judged notequivalent if they differ by morethan the R value
42、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 some-what different results. For further information on
43、the method-ology used in Section 10, consult Practice E691.11. Keywords11.1 flooring; recovery; residual indentation; resilient; staticload4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F06-1005.F970 173ASTM International takes
44、 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 of any such patent rights, and the riskof infringement of such rights, are entirely their own resp
45、onsibility.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 are invited either for revision of this standard or for additional standardsand should be addresse
46、d to ASTM International Headquarters. Your comments will receive careful consideration 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
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