ASTM F2421-19a

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2421 −19a
Standard Test Method for
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Measurement of Resilient Floor Plank by Dial Gauge
This standard is issued under the fixed designation F2421; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method establishes the procedures for determi- 3.1 Definitions: For definitions of terms used in this test
nation of both dimension (length and width) and squareness of method, refer to Terminology F141.
a rectangular resilient floor plank. 3.2 resilient floor plank—shape of a modular flooring ele-
ment where the length is generally significantly longer than the
1.2 The values stated in inch-pound units are to be regarded
width, by at least 2/1, L/W (length/width) aspect ratio. Typical
as standard. The values given in parentheses are mathematical
plank maximums for width run ≤18 in. (457.2 mm) and
conversions to SI units that are provided for information only
maximums for length ≤8 ft (2.44 m).
and are not considered standard.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 The combination of both dimensional properties and
responsibility of the user of this standard to establish appro-
squarenessofresilientfloorplankisanimportantconsideration
priate safety, health, and environmental practices and deter-
because installed flooring may exhibit an objectionable appear-
mine the applicability of regulatory limitations prior to use.
ance when either or both characteristics deviate from estab-
Specific precautionary statements are provided in applicable
lished tolerances. This test method provides a means of
sections of this test method.
determining length and width dimensions along with
1.4 The values stated in inch-pounds units are to be re-
squareness, by using a single apparatus and procedure.
garded as the standard. The values given in parentheses are for
information only.
5. Apparatus
1.5 This international standard was developed in accor-
5.1 The example apparatus consists of five dial gauges and
dance with internationally recognized principles on standard-
two reference index strips mounted on a flat bedplate in a
ization established in the Decision on Principles for the
configuration that, by rotation and flipping of the sample,
Development of International Standards, Guides and Recom-
allows the measurement of all four sides of resilient plank
mendations issued by the World Trade Organization Technical
samples. (See Fig. 1). One edge of the bedplate is elevated to
Barriers to Trade (TBT) Committee.
create a test surface, which is offset or tilted 15 6 1 degrees
from horizontal. The offset applies minimal pressure to the test
2. Referenced Documents
specimen against the longer index strip to ensure repeatable
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2.1 ASTM Standards:
measurement. A reference plate representing target plank size
F141 Terminology Relating to Resilient Floor Coverings
and squareness (see Fig. 2) is used to zero all dial gauges.
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2.2 ANSI Standards:
Referenceplatemustbesubstantialandnotreadilysubjectedto
ANSI/ASQC Z1.4 Sampling Procedures and Tables for In-
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deflection or distortion, i.e. ⁄2 in. (12.7 mm) aluminum,
spection by Attributes
60.001 in. (0.025 mm) tolerance for stated length and width
and for squareness allowable tolerance shall be 90 degrees 6
10 s (1.57080 6 0.0005 rad). Dial gauges should be mounted
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This test method is under jurisdiction of ASTM F06 Committee on Resilient
on adjustable height brackets to allow for optimizing measure-
Floor Coverings and is the direct responsibility of subcommittee F06.20 on Test
ment location, especially for planks with profiled edges (see
Methods
Fig. 3) and 5.2.
Current edition approved Feb. 1, 2019. Published March 2019. Originally
approved in 2005. Last previous edition approved in 2019 as F2421–19. DOI:
5.2 Dial Gauges—The five dial gauges are mounted in
10.1520/F2421-19A.
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guide slots, which are machined into the bedplate to allow for
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
measurement of various plank sizes. For the two corner gauges
Standards volume information, refer to the standard’s Document Summary page on
(B & D) and the squareness gauge (A) the position must be at
the ASTM website.
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least within 10 % of the corner edge relative to the respective
Available from American N
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