ASTM_F_1932_-_F_1932M_-_98_2011e1.pdf

Designation:F1932/F1932M98(Reapproved 2011)1An American National StandardStandard Test Method forMeasuring Sleeping Bag Loft1This standard is issued under the fixed designation F1932/F1932M;the number immediately following the designation indicates the yearof 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.1NOTEEditorially corrected standard designation in December 2013.INTRODUCTIONThe 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,inand of itself,is not to be used to predict the thermal properties of a sleeping bag.1.Scope1.1 This test method covers the determination of the loft ofa sleeping bag under a standardized load.1.2 The test method uses a physical height measurementapplicable in the laboratory.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theinch-pound units are shown in brackets.The values stated ineach system are not exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in nonconformance with thetest method.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Terminology2.1 Definitions:2.1.1 loft,nthe total thickness of a closed sleeping bag asmeasured while the bag is lying flat on a surface.2.1.2 sleeping bag,na structure made of down,syntheticfiberfill,shell fabrics,or other materials,or a combinationthereof,that is designed for people to use for thermal protec-tion when sleeping(for example,outdoors,tent,cabin).3.Significance and Use3.1 In this context,this test method can be used forspecifications,design,and quality control.Loft,in and of itself,is not to be used to predict the thermal properties of a sleepingbag.4.Apparatus4.1 Gantry,a rigid structure of sufficient height and width tospan all sleeping bags to be measured is required.A purpose-built device of the sort shown in Fig.1 may be used,or astructure as simple as an office desk or workbench can suffice.4.2 Rule,having 1-mm 116-in.graduations,and longenough to measure the zero height position.4.3 Disk,having diameter of 30 cm 12 in.The weight ofthe disk plus the rule must equal 50 g 1.8 oz for a pressure of6.9 Pa 0.001 psi.Commercially available foam core dry-mount board is suitable.A range of 61%in diameter and65%in weight is tolerable.Mark the center of the disk forpositioning the rule during the test procedure.5.Conditioning5.1 Remove the sleeping bag from the stuff sack,zip the bagclosed,and shake it for approximately 1 min,(for example,aperson shall hold the bag and shake it,turning it periodicallyduring the shaking).Lay it flat in an uncompressed state for atleast 24 h prior to testing.A bag that has not been compressedin the 24 h prior to testing shall be considered to be conditioned(for example,bags drawn directly from production,bagsshipped uncompressed,replicate tests).6.Procedure6.1 Perform conditioning and testing at ambient tempera-tures between 10C and 25C 55F and 80F,and at a relativehumidity not exceeding 70%.6.2 Place the conditioned sleeping bag on a large flat surfaceand place the gantry on the same surface,spanning the bag.Do1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment,Playing Surfaces,and Facilities and is the direct responsibility ofSubcommittee F08.22 on Camping Softgoods.Current edition approved April 1,2011.Published June 2011.Originallyapproved in 1998.Last previous edition approved in 2004 as F1932 98(2004).DOI:10.1520/F1932_F1932M-98R11E01.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 not excessively shake or refluff the sleeping bag duringplacement.Allow the bag to settle for 5 min.6.3 Place the disk on the center line of the sleeping bag,halfof the distance from the outer bottom(foot)end to the outer top(head)end of the bag.6.4 Position the sleeping bag or gantry,or both,so that therule is directly over the center of the disk(see Fig.1).6.5 Insert the rule vertically through the slot in the gantry.The gantry or sleeping bag,or both,may need to be moved toensure that the rule contacts the exact center of the disk,whileremaining vertical.Allow the rule to rest upon the center of thedisk(see Fig.1).6.6 Measurement Alternatives:6.6.1 Difference Method for Loft DerivationRead the ruleat the top of the gantry(see Fig.1).Remove the sleeping bagand take a second rule reading of the disk alone on the testsurface upon