ASTM F1932-98(2004)
(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 quantitative test method covers the determination of the loft of a sleeping bag under a stanardized 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:F1932–98 (Reapproved 2004)
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 4. Apparatus
1.1 This test method covers the determination of the loft of 4.1 Gantry, a rigid structure of sufficient height and width to
a sleeping bag under a standardized load. span all sleeping bags to be measured is required. A purpose-
1.2 The test method uses a physical height measurement built device of the sort shown in Fig. 1 may be used, or a
applicable in the laboratory. structure as simple as an office desk or workbench can suffice.
1.3 The values stated in either SI units or inch-pound units 4.2 Rule, having 1-mm [ ⁄16-in.] graduations, and long
are to be regarded separately as standard. Within the text, the enough to measure the zero height position.
inch-pound units are shown in brackets. The values stated in 4.3 Disk, having diameter of 30 cm [12 in.]. The weight of
each system are not exact equivalents; therefore, each system the disk plus the rule must equal 50 g [1.8 oz] for a pressure of
shall be used independently of the other. Combining values 6.9 Pa [0.001 psi]. Commercially available foam core dry-
from the two systems may result in nonconformance with the mount board is suitable. A range of 61 % in diameter and
test method. 65 % in weight is tolerable. Mark the center of the disk for
1.4 This standard does not purport to address all of the positioning the rule during the test procedure.
safety concerns, if any, associated with its use. It is the
5. Conditioning
responsibility of the user of this standard to consult and
5.1 Remove the sleeping bag from the stuff sack, zip the bag
establish appropriate safety and health practices and deter-
mine the applicability of regulatory limitations prior to use. closed, and shake it for approximately 1 min, (for example, a
person shall hold the bag and shake it, turning it periodically
2. Terminology
during the shaking). Lay it flat in an uncompressed state for at
2.1 Definitions: least 24 h prior to testing. A bag that has not been compressed
2.1.1 loft, n—the total thickness of a closed sleeping bag as in the 24 h prior to testing shall be considered to be conditioned
measured while the bag is lying flat on a surface. (for example, bags drawn directly from production, bags
2.1.2 sleeping bag, n—a structure made of down, synthetic shipped uncompressed, replicate tests).
fiberfill, shell fabrics, or other materials, or a combination
6. Procedure
thereof, that is designed for people to use for thermal protec-
6.1 Perform conditioning and testing at ambient tempera-
tion when sleeping (for example, outdoors, tent, cabin).
tures between 10°C and 25°C [55°F and 80°F], and at a relative
3. Significance and Use
humidity not exceeding 70 %.
3.1 In this context, this test method can be used for 6.2 Place the conditioned sleeping bag on a large flat surface
specifications, design, and quality control. Loft, in and of itself, and place the gantry on the same surface, spanning the bag. Do
is not to be used to predict the thermal properties of a sleeping not excessively shake or refluff the sleeping bag during
bag. placement. Allow the bag to settle for 5 min.
6.3 Place the disk on the center line of the sleeping bag, half
of the distance from the
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