1、Designation:D757110(Reapproved 2014)1Standard Specification forRetained Sewn Seam Strength After Exposures to Hot Airand Open Flame1This standard is issued under the fixed designation D7571;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEThe order of the wording in 4.1 was changed from“.exposures are likely not to.”to“.exposures are notlikely to.”e
3、ditorially in August 2014.INTRODUCTIONSewn seam strength of flame resistant textile products is a critical measurement of structuralintegrity.This is particularly important for flame resistant(FR)personal protective clothing andequipment(PPE),which is designed to provide safety to any worker who may
4、,during the service lifeof the PPE,experience multiple short term exposures to high heat.While“new”FR protective clothingitems can provide the wearer with protection that meets a specific performance requirement,it isuseful to know what the cumulative effects of repeated exposures to high heat can d
5、o to the integrityof the sewn seams used to construct protective clothing items.In addition,it is useful to know howthe cumulative exposures can affect the sewn seam strength performance of the PPE when exposed toan open flame for a short period of time.During normal use,some FR specialized clothing
6、 items can,for short durations,be repeatedlyexposed to high heat.While the cumulative effect of repeated short duration exposures to high heatis known to result in a loss of fabric strength,these same exposures can also result in a loss of sewingthread break strength.This loss of break strength can
7、result in lower retained sewn seam strength thatcan put the wearer at potential risk of injury if the garment is too weak to maintain integrity of thestructure.While there are recognized minimum sewn seam strength values required for new FR garments,never exposed to heat or flame hazard,this standar
8、d is intended to measure the retained sewn seamstrength after repeated exposures to high heat and a subsequent exposure to open flame.These data may be useful as additional information for agencies that want criteria to establishselection,care,maintenance and retirement/replacement of FR protective
9、clothing.1.Scope1.1 This specification covers the retained sewn seamstrength of flame resistant fabric subassemblies after repeatedshort duration exposures to hot air or repeated short-durationexposures to hot air and subsequent short-term exposures toopen-flame impingement.1.1.1 This specification
10、is used to determine minimumretained sewn seam strength after these exposures.1.2 This standard is not intended to serve as a detailedmanufacturing or purchasing specification,but can be refer-enced in purchase contracts to ensure that minimum perfor-mance requirements are met.1.3 Controlled laborat
11、ory tests used to determine compli-ance with the performance requirements of this standard shallnot be deemed as establishing performance levels for allsituations to which wearers of FR protective clothing arepotentially exposed.1.4 Mandatory requirements are indicated by use of shall;recommendation
12、s and advising information is indicated byshould.1.5 This standard is used to measure and describe theresponse of materials,products,or assemblies to heat andflame under controlled conditions,but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materia
13、ls,products,or assemblies underactual fire conditions.1This specification is under the jurisdiction of ASTM Committee D13 onTextiles and is the direct responsibility of Subcommittee D13.52 on Flammability.Current edition approved July 1,2014.Published August 2014.Originallyapproved in 2010.Last prev
14、ious edition approved in 2010 as D7151-10.DOI:10.1520/D7571-10R14E01.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1.6 Fire testing is inherently hazardous.Adequate safe-guards for personnel and property shall be employed inconducting t
15、hese tests.1.7 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 establish appro-priate safety and health practices,and determine the applica-bility of regulatory limitations prior to use.2.Refer
16、enced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1683 Test Method for Failure in Sewn Seams of WovenApparel FabricsD1776 Practice for Conditioning and Testing TextilesD4391 Terminology Relating to The Burning Behavior ofTextilesD6193 Practice for Stitches and SeamsD7016 Test Method to Evaluate Edge Binding ComponentsUsed in Mattresses After Exposure to An Open Flame2.2 AATCC Test Methods:3TM 135 Dimensional Changes of Fabrics after Home Laun-dering2.3 ISO Documents:4ISO 1
