ASTM F1932-98(2011)
(Test Method)Standard Test Method for Measuring Sleeping Bag Loft
Standard Test Method for Measuring Sleeping Bag Loft
SIGNIFICANCE AND USE
In this context, this test method can be used for specifications, design, and quality control. Loft, in and of itself, is not to be used to predict the thermal properties of a sleeping bag.
SCOPE
1.1 This test method covers the determination of the loft of a sleeping bag under a standardized load.
1.2 The test method uses a physical height measurement applicable in the laboratory.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the test method.
1.4 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F1932 − 98(Reapproved 2011) An American National Standard
Standard Test Method for
Measuring Sleeping Bag Loft
This standard is issued under the fixed designation F1932; 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.
INTRODUCTION
The loft (that is, thickness) of a sleeping bag refers to the total thickness of a closed sleeping bag.
It is a physical dimension/measurement used for specifications, design, and quality control. Loft, in
and of itself, is not to be used to predict the thermal properties of a sleeping bag.
1. Scope 3. Significance and Use
3.1 In this context, this test method can be used for
1.1 This test method covers the determination of the loft of
a sleeping bag under a standardized load. specifications, design, and quality control. Loft, in and of itself,
is not to be used to predict the thermal properties of a sleeping
1.2 The test method uses a physical height measurement
bag.
applicable in the laboratory.
4. Apparatus
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. Within the text, the
4.1 Gantry, a rigid structure of sufficient height and width to
inch-pound units are shown in brackets. The values stated in
span all sleeping bags to be measured is required. A purpose-
each system are not exact equivalents; therefore, each system
built device of the sort shown in Fig. 1 may be used, or a
shall be used independently of the other. Combining values
structure as simple as an office desk or workbench can suffice.
from the two systems may result in nonconformance with the
4.2 Rule, having 1-mm [ ⁄16-in.] graduations, and long
test method.
enough to measure the zero height position.
1.4 This standard does not purport to address all of the
4.3 Disk, having diameter of 30 cm [12 in.]. The weight of
safety concerns, if any, associated with its use. It is the
the disk plus the rule must equal 50 g [1.8 oz] for a pressure of
responsibility of the user of this standard to consult and
6.9 Pa [0.001 psi]. Commercially available foam core dry-
establish appropriate safety and health practices and deter-
mount board is suitable. A range of 61 % in diameter and
mine the applicability of regulatory limitations prior to use.
65 % in weight is tolerable. Mark the center of the disk for
positioning the rule during the test procedure.
2. Terminology
5. Conditioning
2.1 Definitions:
2.1.1 loft, n—the total thickness of a closed sleeping bag as
5.1 Remove the sleeping bag from the stuff sack, zip the bag
measured while the bag is lying flat on a surface.
closed, and shake it for approximately 1 min, (for example, a
person shall hold the bag and shake it, turning it periodically
2.1.2 sleeping bag, n—a structure made of down, synthetic
during the shaking). Lay it flat in an uncompressed state for at
fiberfill, shell fabrics, or other materials, or a combination
least 24 h prior to testing. A bag that has not been compressed
thereof, that is designed for people to use for thermal protec-
in the 24 h prior to testing shall be considered to be conditioned
tion when sleeping (for example, outdoors, tent, cabin).
(for example, bags drawn directly from production, bags
shipped uncompressed, replicate tests).
This test method is under the jurisdiction of ASTM Committee F08 on Sports
6. Procedure
Equipment and Facilitiesand is the direct responsibility of Subcommittee F08.22 on
Camping Softgoods.
6.1 Perform conditioning and testing at ambient tempera-
Current edition approved April 1, 2011. Published June 2011. Originally
tures between 10°C and 25°C [55°F and 80°F], and at a relative
approved in 1998. Last previous edition approved in 2004 as F1932 - 98 (2004).
DOI: 10.1520/F1932-98R11. humidity not exceeding 70 %.
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