ASTM F970-00
(Test Method)Standard Test Method for Static Load Limit
Standard Test Method for Static Load Limit
SCOPE
1.1 This test method is intended for use in determining the recovery properties of resilient floor covering after long-term indentation test, 24 h under the load specified in the detail specification. The reported value, residual compression, is the depth of hole remaining 24 h after removal of the specified load.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F 970–00
Standard Test Method for
Static Load Limit
This standard is issued under the fixed designation F 970; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Armstrong Indentation Machine, heavy duty, as de-
scribed in 4.2 and pictured in Fig. 1 of Test Method F 1914.
1.1 This test method is intended for use in determining the
4.4 Indentor Plates, each constructed of a piece of 2-in.
recovery properties of resilient floor covering after long-term
square stainless steel, 0.240 6 0.005 in. (6.1 6 0.1 mm) thick,
indentation test, 24 h under the load specified in the detail
with one side turned to 1.125 in. (28.6 mm) in diameter (one
specification. The reported value, residual compression, is the
square inch area) to depth of 0.150 in. (3.8 mm) (see Fig. 1).
depth of hole remaining 24 h after removal of the specified
4.5 Dial Micrometer, as described inTest Method F 386, but
load.
the foot shall exert a force of 1-oz (28.4 g) weight.
1.2 This standard does not purport to address all of the
4.6 Template of Poly(methyl Methacrylate) (PMMA), or of
safety concerns, if any, associated with its use. It is the
other transparent material, 2 by 2 in. (50.8 by 50.8 mm) with
responsibility of the user of this standard to establish appro-
round scratch line centered on the template that is 1.125 in. in
priate safety and health practices and determine the applica-
diameter, defining the test area, and with a ⁄2 in. (12.7 mm)
bility of regulatory limitations prior to use.
diameter hole at the center of the template to draw a circle on
2. Referenced Documents the specimen where thickness will be measured.
4.7 Die, 2 by 2 in. and press, papercutter, or equivalent to
2.1 ASTM Standards:
cut specimens to 2 by 2 in. size.
E 171 Specification for Standard Atmospheres for Condi-
4.8 Optional—Open box without spring clips for 2 by 2 in.
tioning and Testing Materials
photographic slides, or equivalent, to separate specimens
F 386 Test Method for Thickness of Resilient Flooring
during conditioning and recovery periods.
Materials Having Flat Surfaces
F 1914 Test Method for Short-Term Indentation and Re-
5. Test Specimen
sidual Indentation of Resilient Floor Covering
5.1 The specimen shall be 2 by 2 in.
E 691 Practice for Conducting an Interlaboratory Study to
5.2 The central one square inch test area should be free of
Determine the Precision of a Test Method
mortar lines or other embossing lines, if possible. If not
3. Significance and Use
possible, the largest flat, raised area should be centered on the
specimen.
3.1 This test methodisameaningfultestfordetermining the
5.3 If the sample is nubble embossed, the specimen should
indentation recovery properties of sheet vinyl floor covering.
be cut so that a nub is at the center of the specimen where the
This test method can be used to make estimates of suitability
specimen will be gaged.
depending upon recommended or intended use.
5.4 A circle slightly larger than the 0.250 in. diameter foot
4. Apparatus
of the thickness gage (4.5) is drawn on the wear layer at the
center of the specimen, using the PMMA template (4.6), to
4.1 The following apparatus shall be used:
ensure that thickness measurements are made at the same spot.
4.2 Conditioning Room, providing the standard laboratory
atmosphere of 50 6 5 % relative humidity at a temperature of
6. Conditioning
73.4 6 3.6°F (23 6 2.0°C).
6.1 Conditionthetestspecimenatleast16hat73.4 6 3.6°F
and 50 6 5 % relative humidity and test in the same environ-
ThistestmethodisunderthejurisdictionofASTMCommitteeF06onResilient
ment.
Floor Coverings and is the direct responsibility of Subcommittee F06.30 on Test
Methods—Performance.
7. Procedures
Current edition approved Sept. 10, 2000. Published November 2000. Originally
published as F 970–87. Last previous edition F 970–99.
7.1 Gage the specimen, wear layer up, at the center of the
Annual Book of ASTM Standards, Vol 15.09.
specimen to the nearest 0.001 in. using the dial micrometer
Annual Book of ASTM Standards, Vol 15.04.
4 with 0.250 in. diameter flat foot and 1-oz. weight. Record the
Annual Book of ASTM Standards, Vol 14.02.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
F970–00
9. Report
9.1 Report the residual indentation which is the initial
thickness (7.1), minus the final thickness (7.8). If more than
one specimen is tested, report the residual indentation of each
specimen.
9.2 The static load limit is the maximum load to reach a
permanent indentation of 0.005 in. (0.125 mm).
10. Precision and Bias
10.1 Precision Statement for Test Method: 75 psi—
NOTE—All dimensions are in inches. Tolerance is 60.005 in. (60.1
Precision, characterized by repeatability, Sr, r, and reproduc-
mm).
ibility, SR, R, has been determined for the materials to be:
Metric Equivalents:
Materials Average Sr SR r R
Inches Millimetres
MaterialA 1.2900 0.4606 0.7244 1.2897 2.0283
Material B 1.8383 0.7251 0.9941 2.0302 2.7835
2.000 50.8
1.125 28.6 Material C 2.5400 0.6315 1.6225 1.7683 4.5431
Material D 0.7817 0.3405 1.2443 0.9533 3.4841
0.240 6.1
0.150 3.8 Material E 1.0283 0.4295 0.5103 1.2027 1.4289
Material F 1.2583 0.3515 0.8906 0.9842 2.4938
0.090 2.3
Material G 1.1517 0.3130 0.5485 0.8765 1.5357
FIG. 1 Indentor Plates for Static Load Limit Test
Material H 0.8050 0.4396 0.7639 1.2309 2.1389
10.2 Precision Statement for Test Method: 125 psi—
Precision, characterized by repeatability, Sr, r, and reproduc-
measurement on the specimen, away from the central one
ibility, SR, R, has been determined for the materials to be:
square inch test area, or in a notebook.
Materials Average Sr SR r R
7.2 Place the 2 by 2 in. indentor plate on top of the 2 by 2
MaterialA 1.5650 0.4410 0.6230 1.2347 1.7444
in. specimen with
...
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