ASTM F1112-06a
(Test Method)Standard Test Method for Static Testing of Tubeless Pneumatic Tires for Rate of Loss of Inflation Pressure
Standard Test Method for Static Testing of Tubeless Pneumatic Tires for Rate of Loss of Inflation Pressure
SIGNIFICANCE AND USE
Inflation pressure retention is an important property of tire performance because underinflation can adversely affect tire rolling resistance, handling, structural integrity, and tread life.
This test method is useful for research and development evaluation of the effects of tire component formulations and geometry on inflation pressure retention. Testing for rate of pressure loss under static conditions is practical because of the following:
5.2.1 Tires in normal use are predominantly at rest, and
5.2.2 Relative air diffusion rates of various tires in normal intermittent road service will correlate with static relative rates, to a first approximation. The relative air diffusion rates of different tires may not be quite the same under dynamic flexing as when tested statically, but the difference is believed to be small.
The results from this test method are not suitable for inferring tire inflation retention under severe service conditions, such as heavy cornering or impacts, that might cause significant air loss at the tire-rim seal.
SCOPE
1.1 This test method covers the determination of the rate of inflation pressure loss resulting from air diffusion through the structures of tubeless tires under constant temperature conditions. The testing is done under static conditions, that is, nonrotating, nonloaded tires.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, 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: F1112 – 06a
Standard Test Method for
Static Testing of Tubeless Pneumatic Tires for Rate of Loss
1
of Inflation Pressure
This standard is issued under the fixed designation F1112; 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 3.1.3 normalized inflation pressure, n— measured pressure
ofatireadjusted,accordingtotheidealgaslaw,tothenominal
1.1 This test method covers the determination of the rate of
test temperature and one atmosphere external barometric
inflation pressure loss resulting from air diffusion through the
pressure. F538
structures of tubeless tires under constant temperature condi-
tions. The testing is done under static conditions, that is,
4. Summary of Test Method
nonrotating, nonloaded tires.
4.1 Test tires are mounted on rims, fitted with calibrated
1.2 The values stated in SI units are to be regarded as the
precision pressure measuring devices, inflated to the desired
standard. The values given in parentheses are for information
pressure, and, after a period of stabilization, are monitored for
only.
inflation pressure as a function of time under static, constant
1.3 This standard does not purport to address all of the
temperature conditions.
safety concerns, if any, associated with its use. It is the
4.2 Measured inflation pressures are normalized to the
responsibility of the user of this standard to establish appro-
nominal test temperature and one atmosphere barometric
priate safety and health practices and determine the applica-
pressure for calculation of pressure loss rates.
bility of regulatory limitations prior to use.
4.3 Two or more tires per tire specification are tested for
2. Referenced Documents pressure loss rate over a period of two to six months. High
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precision in the equipment and data may allow shortening the
2.1 ASTM Standards:
test. See 9.6, 10.5, and Section 12.
D4483 Practice for Evaluating Precision for Test Method
4.4 The pressure loss rate is calculated as percent loss per
Standards in the Rubber and Carbon Black Manufacturing
month at the nominal test temperature and one atmosphere
Industries
barometric pressure (101.3 kPa).
F538 Terminology Relating to the Characteristics and Per-
formance of Tires
5. Significance and Use
3. Terminology 5.1 Inflation pressure retention is an important property of
tire performance because underinflation can adversely affect
3.1 Definitions:
tire rolling resistance, handling, structural integrity, and tread
3.1.1 inflation pressure loss rate, n—rate of change of
life.
normalized inflation pressure, determined from the slope of the
5.2 This test method is useful for research and development
linear portion of the log pressure versus time curve. F538
evaluation of the effects of tire component formulations and
3.1.2 measured inflation pressure, n—gauge pressure of a
geometry on inflation pressure retention. Testing for rate of
tire measured at a given time under ambient temperature and
pressure loss under static conditions is practical because of the
barometric pressure. F538
following:
5.2.1 Tires in normal use are predominantly at rest, and
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This test method is under the jurisdiction of ASTM Committee F09 on Tires
5.2.2 Relative air diffusion rates of various tires in normal
and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-
intermittentroadservicewillcorrelatewithstaticrelativerates,
Vehicular) Testing.
to a first approximation. The relative air diffusion rates of
CurrenteditionapprovedJuly1,2006.PublishedJuly2006.Originallyapproved
in 1987. Last previous edition approved in 2006 as F1112 – 06. DOI: 10.1520/
differenttiresmaynotbequitethesameunderdynamicflexing
F1112-06A.
as when tested statically, but the difference is believed to be
2
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small.
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F1112 – 06a
5.3 The results from this test method are not suitable for 7.10 Apressure-measuring device shall be connected to the
inferring tire inflation retention under severe service condi- adapter (or valve) to continuously measure inflation pressure.
tions, such as heavy cornering or impacts, that might cause The device shall have a resolution of at least 2 kPa (0.25 psi)
significant air loss at the tire-rim seal. and an accuracy of 61 %
...
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