53
24
Ozonechambers
SATRAozonetestingtechnologyhasevolvedasaresultofmorethan30yearsofexperience.State-
of-the-arttechnologyandconstructiontechniqueshavebeencombinedwithexpertisetoproducea
reliable,accurate,fullyautomated,labourandcost-savingunitwhichistrulyenvironmentallysafe.
Anintegralclosedloopair-ozonesystemensuresthathazardousozonegasiscontainedinternally
–eliminatingtheneedtoprovideadditionalexternalventingandfilteringofthespentgases.
Theheavydutyaluminiumexposurechamberhasananti-corrosiveinteriorandiscompletewith
rackingsystemtoacceptsample-mountingapparatus.Arangeofstaticanddynamicsampleholders
tointernationalstandardsisavailable.Accessisviaadouble-glazed,airtightandsafetyinterlocked
door.Entrytothetestareaispreventeduntiltheinteriorenvironmentrevertstosafeambientlevels.
Exteriorlightingcanbeexcludedfromthetestareaviaashade,whiletheinteriorcanbelitbythe
integraltestinspectionlamp.
Controlsanddigitaldisplaysarelogicallylaidoutonacontrolpanelandreflectthesimplicityof
operationrequiredtosetupatestroutine.Theonlyrequirementistosettheozoneconcentration,
temperature,airflow,relativehumidity(model903chamberonly),teststartandfinishtime.
Theozoneconcentrationisvariablefrom25-500partsperhundredmillion(pphm)–25-2,000pphm
option– andisautomaticallycontrolledand monitored.The setconcentration and monitored
concentrationaredigitallydisplayed,withthemonitoredconcentrationsimultaneouslyoutputtoPC
(viaCalcommsgraphicalsoftware).
Ozonedeliveryaccuracyof±5percentnominalfullscaledelivery(FSD)orbetter,typically±2pphm
in50pphm,measuredunderstableabsorptionconditions.Typicalrecoverytimesaftersample
insertion:achieves10percentofsetvaluewithin15minutes.
OzonegenerationisviaUVozonelampswithamaximumozonegeneratedoutputof200pphmat
250litres/min,andthereisahighozoneoptionof2,000pphm.Theozonisedairflowof40-440
litres/minisinfinitelyvariable,allowingamaximumofthreeairchangesperminuteandaneffective
velocityof3.3-33.3mm/sec.Theinternalcirculationfancanbeswitchedontogive600mm/sec(2
feet/sec)accordingtoASTMD1149.Ozoneconcentrationmeasurementaccuracyis±2pphm.
Controlaccuracyis4percentofsetpoint(±2pphmat50pphm).
Thetesttimerprovidesdigitalprogrammingofuptosevendays,withteststartandteststop.
HTE703
Temperaturerangeoptionsformodel703:0-70°C.*10-70°C.(Ambient+5)°C-70°C.
*Thetestingofrubberatlowtemperaturesdownto0°Ciswelldocumented,andconclusionsfrom
experimentsundertakenusingSATRAtestchambers,whicharecapableofachievingsuchlow
temperatures,mayhaveanimportantbearingonthefuturedevelopmentofozonetestmethods.
Temperaturecontrolaccuracy:±1°Cat40°Cand±2°Cat70°C.Typicaltemperatureandozone
recoveryperiodfollowingsampleinsertionis<10percentofsetpointafter15minutesand4percent
after30minutes(coldstarttimeswillvary).
Electricalsupply220-240V/singlephase/50-60Hzratedat1kVAsystem,unaffectedbyvariationsof
10percentfromnormal.
HTE903
Temperaturerangeformodel903:0-70°C.Allrangesareautomaticallycontrolledbyasolidstate
digitalproportionalcontroller,temperaturedigitallydisplayedandsimultaneouslyoutputtoaPC(via
Calcommsgraphicalsoftware).
Relativehumidity(RH)controlformodel903:Range50percentto80percentRHoverexposure
chambertemperaturerangeof23-40°C.Controlaccuracyof±5percentRHisachievedatconstant
temperature.
Watersupply:Maximumtemperature15°C.Minimumpressure2bar.Maximumflowrequired80
litres/hour.Inareasofhardwater,ade-calcinatorshouldbeused,andwhereamaximumwater
temperatureof15°Ccannotbemaintained,arecirculationchillersystemshouldbeemployed.
Electricalsupply220–240V/singlephase/50-60Hzratedat3kVAsystemunaffectedbyvariationsof
10percentfromnormal.
HTE703/903Ozonetestchambers
46
25
Permeability
ThisisapreferredSATRAtestandunlikemanyothermethodsitattemptstosimulatethe
environmentwithin a shoe,that is100%relative humidityatfoottemperature.Aswell as
measuringtheamountofmoisturetransmittedthroughthematerial,thequantityofmoisture
absorbedbytheuppercan also bedetermined.Thisisimportantbecause althoughsome
materialsmaybeimpermeable,theabilitytoabsorbmoisturemeansthatthefootwillfeeldry
tothewearer.Themoisturecandesorbfromthematerialbyevaporationoncetheshoeisoff
thefoot,forexample,overnight.
Anassemblyofdiscsofoutermaterial,lining(ifusedinthefootwear)andastandardhose
(sock)fabricisclampedandsealedacrossthetopofaplasticpotcontainingdistilledwater.The
waterinsidethepotismaintainedatatemperatureof32°Cbyrestingthepotinatemperature-
controlledwaterbath.Theatmosphereoutsidethepotismaintainedbycarryingoutthetestin
aconditionedroomandmaintainingaflowofairacrossthetopofthepotataspeedequivalent
toabriskwalkingpace.Iftheouterispermeable,watervapourpassesthroughthecottonhose
andthetestmaterialinthesamewaythatperspirationwouldinashoe.
Thepermeabilityofthematerialisdeterminedbymeasuringtheweightlossoftheassemblyat
intervalsthroughoutasix-hourperiod.Careisneededduringthetesttoavoidsplashingthe
reverseofthetestsamplewiththewaterinsidethepotandtoensurethattheoutersurfaceof
the testpotisthoroughlydried afteritisremoved fromthewaterbath forweighing.The
absorptionoftheuppermaterial,liningandthestandardcottonhosearemeasuredbyweighing
eachdiscatthestartandendoftest.
STM175SATRApermeabilityandabsorptiontest
Thisdevicedeterminestheamountofwatervapouramaterialwilltransmitthroughitsstructure
inaspecifiedtime.Thetestismainlyapplicabletoleathersandtextilesusedinfootwearuppers
andclothingwhereitgivesameasureoftheabilitytoremoveperspirationfromthesurfaceof
thewearerʼsskin.
TheSATRAmachinehassixseparateteststationsonarotarytableandeachonehasasample
holder.Silicageldesiccantisplacedintheholderandthetestmaterialisplacedovertheneck
oftheholderandsecuredbyascrewtop.Afterweighingeachholder,completewithsilicagel
andsamplematerial,theholdersareplacedandlockedintotherotarymechanism.After7-8
hoursthecompleteholderisweighedagainandthegainisusedtodeterminethedegreeof
permeability.Itisessentialthattheentireoperationiscarriedoutinaconditionedatmosphere.
InadditiontothestandardequipmentsuppliedwiththeSTM473,thereisabuilt-intimerto
recordthenumberofhoursthattestinghasbeencarriedout.
STM473Watervapourpermeability
TheSTD478watervapourabsorptiontestapparatusmeasuresamaterialʼsaffinitytoabsorb
watervapour.Atestspecimenisclampedbetweentheopenendofatestpot(containinga
specifiedvolumeofwater)andanimpermeableseal.Thepotisthenstoredataspecified
temperatureforasettime,afterwhichthechangeinmassofthespecimenisdetermined.
TheSTD478testapparatusconsistsofsixtestpotseachhavinganinternaldiameterof35mm
andavolumeof100cm3,aremovablelidwhichcanbesecurelyclampedovertheopenendof
thepotandanimpermeablesealheldovertheendofthepotbythelid.
InadditiontotheSTD478apparatus,alaboratorybalanceandastopwatcharenecessaryto
determinewatervapourabsorption(availablefromSATRA).
STD478Watervapourabsorption
21
26
Pinchandgrip
Ithaslong beenrecognised thatgoodglovegrip isanimportant
considerationforgloveusers,satisfactoryperformanceandsafety
canbecompromisedbygloveswithpoorgripcharacteristics.
Historically, glove standards have been primarily aimed at the
protectivepropertiesoftheglovesoratbasicdexteritytesting.These
twonewmachinesaredesignedtofillthisgapinthetestingprotocol
andhavebeendesignedwithinputfromwithinthegloveindustry.
TheSTD620pinchtesterisdesignedtotestperformanceofthe
fingerandthumbʻpinchgripʼelementofthegloves,whiletheSTD
621griptesterisdesignedtotesttheperformanceofthewholehand
grip.Bothmachinesutiliseloadcellstorecordforcedata,andboth
machinesaresuitablefortestingawiderangeofglovesfromfine
textileandlatextypeproductsuptoheavydutyindustrialgloves.
Testingcanbeundertakenonbothcleanandcontaminatedgloves
andbycombiningthetwodifferenttestmethodsanoverallresultfor
wholeglovegripcanbeobtained.
STD620/STD621Glovepinchandgriptests
STD621
STD620
32
27
Pipiness
Thisisawidely-usedreferencescaleformeasuringthewrinklingofthegrainofleatherorthe
topsurfaceofasyntheticmaterialwhenfoldedinwardstoastandardcurvature
Itconsistsofagradedselectionofreplicasofleathernumberedonetoeightwithdifferent
amountsofpipinessandamandrelforbendingthesampletothesameradiusasthescale.
Byusingthenumberedscale,amoreobjectiveevaluationcanbemadeofthepipinessofa
material.
STD174Break/pipinessscale
TheplastimeteristhestandardSATRAtestmethodforassessingthesettingpropertiesof
leather.Itisalsousedtotestnewsyntheticuppermaterialsandchecktheperformanceofheat
settingmachinesbyusingasampleofmaterialofknownheatsettingproperties.
Adiscofmaterialtobetestediscementedtoabrassringandthenplacedintheplastimeterʼs
clampinghead.Itisthendeformedbyforcingintoitanon-metallicdome.Thissimulateslasting
andiscontrolledbymeasuringtheheightoftheformeddomeofmaterialwithamicrometer.The
deformationgivesanareaincreaseofaround15%.
Whileitisinthestrainedposition,thedomeplastimetercontainingthesampleispassedthrough
theheatsettingmachine.Aftertreatment,thedomeisremovedandthecapheightofthedome,
shapedinthematerial,ismeasuredatvarioustimes.Fromthis,thedomeareaiscalculatedand
theproportionoftheareaincreaseretainedistheʻplasticityʼorʻsetʼofthematerial.
STD449Lowprofileplastimeter
Resilience
Plastimeter
TheSTD645isasturdybench-mountedinstrumentdesignedtomeettherequirementsofthe
rubberindustry.
Reboundresilience(elasticity)facilitatesasimplemethodofmeasuringdampingproperties
andiscommonlyusedinconjunctionwithhardnesstestingforbasicqualitycontrol.
Thesampleislocatedagainstapolishedanvilandsecuredbyspringclips.Adjustmentcanbe
made toaccommodatedifferencesinsamplethickness.Thependulumisreleasedfroma
horizontalpositionandstrikesthesampleataverticalpoint.Itsreboundheightisdisplayed
digitallyasapercentageofitsdistancefromthehorizontalstartposition.
STD645Resiliencetester
56
28
Rubfastness
Thesemachinesaredesignedtocarryoutarubfastnesstestonthesurfaceofleathertodetermine
theamountofʻmarringʼoftheleathersurfaceorthefinishandtoassesstheamountofcolourtransfer
fromthesampletotherubbingpad.
Thetestcanbecarriedoutunderdryorwetconditionsbyusingadryrubbingpad–orpre-wetting
therubbingpadindistilledwaterorasweatsolutionpriortotesting.Thesamemachinecanalsobe
usedtoassesstheabrasionresistanceofinsoleboards.ThistestiscoveredbyVESLIC–C4500and
IUP450.
Thetestingmachinesaresuitableforawiderangeofteststhatrequireaʼtoandfroʼmovementona
materialsurface.Therubbingelement,numberofcycles,loadandtemperaturecanbeadjustedto
suitthetestmaterialrequirements.
Therearetwomodels:asingle(STM421)andatwo-station(STM643B)machine.Thelatteralsohas
thebenefitofhavingonestationheatedforironingtests.Thistestisusedtodeterminethereaction
oftheleathersurfacetotheapplicationofheatandpressureparticularlywhenexperiencedduring
ʻironingʼbutalsowhenassociatedwiththenormallastingprocess.Thermoplastic-basedfinishesare
particularlysusceptibletodamagethroughironing.Theironingcharacteristicsoftheleathercanbe
influencedbytheadditionofagentsinthefinishwhichhelpthemtoachievealeathersurface
favourabletoironing.Ametalfootisprovidedwiththemachinetofacilitatetheironingprocess.This
testiscoveredbyVESLIC–C4580.
Theabrasioneffectofsolingmaterialsonuppermaterialscanalsobetestedonthisequipment.Using
asmallprofiledrubberpadinplaceofthefeltpad,samplescanbetestedforthiseffect.Abrasionof
theupperbythesolingmaterialcanbecausedinnormalwearparticularlywhenwearerscrosstheir
legsandthesoleofonefootrestsontheupperoftheotherfoot.ThistestiscoveredbyVESLIC–
C4505.
Theabilitytopre-tensionthetestsampleisafeatureofbothmodels.Thisisparticularlyusefulwhen
testingstretchyleathersandisarequirementoftheabrasiontestunderC4580.
Operationissimple.Thesampleisplacedonthetestsurfaceandclampedusingtheclampsprovided.
Pre-tensioningcanbeeffectedbyadjustmentoftheknoborscrewinconjunctionwiththepercentage
scaleengravedonthetestingtable.Apre-determiningcounterisfittedtothemachine,causingitto
stopwhenthepre-determinedcountisreached.Thesquarefeltpad(STM421P)isinsertedinthe
machinedholderontheendoftherubbingheadwhichisthenloweredtothesurfaceofthetest
sampleandthemachineswitchedon.Thematerialsurfaceandtherubbingpadareinspectedvisually,
inthecaseofcolourtransfer,thewool-feltrubbingpadisevaluatedusingthegreyscaleprovided
witheachmachine.
Aninitialsupplyofwool-feltpadsisincludedwitheachmachine.
TheSTM643BistheonlyequipmentapprovedandpromotedbyVESLIC.
STM643B/STM421Rubfastnesstester
STM643B
STM421
Thismachinedeterminesthefastnessofthefinishofaleatherupper,leatherlining,synthetic
upperorliningandfibreboard.Rubbingcanbecarriedoutindryorwetconditions.Thelatter
canbewater,solventsinshoepolish,ortoepuff(boxtoe)solventsappliedtothebackofthe
material.
Fastnesscanbejudgedbytheeffectonthesamplematerialorthetransferofcolourtothe
rubbingpad.Thechangeinappearanceofthefinishandthecolourtransferredtotherubbing
padisassessedbyreferencetoastandardscale.
Themachinescanalsobeusedfortestingtherub/abrasionresistanceofinksonprintedfilms
underdryoroilyconditions.
Themachinehasarotatingheadholdingacircularfeltpadunderaloadofeither0.73kgor2.5kg
asrequired.Therotatingheadandfeltpadcanberaisedfromthesamplesurfacebymeans
ofahandleverorautomaticallyinthecaseofSTM462,allowingthetestspecimentobe
examinedduringthecourseofthetest.Thecounteroperatesonlywhenthefeltpadisincontact
withthetestspecimen.Itisapre-determinedcounterwhichcanbesettostopthemachine
whenthepresetcounthasbeenreached.
STM461Circularrubfastnesstester
28
29
Shockabsorption
Althoughthehumanbodycanbeeffectiveinabsorbingshockwhenjumping,runningorwalking,
injuriescanstilloccurthroughimpactloadingtothefoot.Suchinjuriescouldbemitigatedbythe
provision of shock absorbing g capabilities s within footwear. For everyday footwear, shock
absorbancewithintheheelconstructioncanbeabenefittothewearer.Sportsfootwearand
otherhigh performancefootwear,includingformilitaryuse,poseadditionalchallengesfor
managingimpactloading.
Forall these typesoffootwear,being able toconducta controlled,mechanisedtestwith
repeatableresultstodetermineshockabsorptioncapabilitiesprovidesavaluablecontribution
toproductdesign,verificationorassuranceofconsistentquality.
TheSTM479allowsadynamicshockabsorptiontesttobecarriedoutonfootwear,cushion
insocksorconstructionmaterialsandprovidesquantifiabletestresults.Themachineoperates
by allowing g a known mass s to o fall onto o the e sample e from a a defined d height. . By use of an
accelerometeranddisplacementtransducer,avalueforthepeakdeceleration(gfactor)forthe
fallingmassisdetermined.Inaddition,thetestallowsanassessmenttobemadeoftheenergy
returnonrebound.Thisinformationisdisplayedonacomputer–notsupplied–andgraphical
displayscanbeprinted.ThismachineissuitedforcombinationtestingwithSATRASTM512
repeatedcompressiontester.
STM479Dynamicshockabsorption
Rubfastness
STM462Circularrubfastnesstester
ThismachinehasalltheattributesoftheSTM461butwithtwoadditionalfeatures.
1. Anautomaticfeaturetoraiseandlowerthefeltpadtoandfromthespecimensurfacewhile
thetestisinprogress:thispreventsoverheatingofthespecimenasaresultofabrasion
betweenthefeltpadandthetestspecimenwhichcanadverselyaffectresults.
2. Anairblowerwhichdirectsanadjustablestreamofcoolingairontothesurfaceofthespecimen
topreventoverheatingofthesampleduringthetest.
44
30
Slipresistance
The SATRAslip resistance testerhas s been n developed following
extensivebiomechanicalstudies.Anormalwalkingstepcommences
withheelstrikeandendsasthetoeisliftedfromtheground.Slipis
mostlikelytooccurshortlyafterheelstrikeandjustbeforetoelift
when half body y weightisbeing g applied.The SATRAequipment
recreatestheseconditionsandmeasurestheslipresistancebetween
the sole of the footwearand the floorsurface.The equipmentʼs
uniquedesign allowsitto measuretheslip resistanceofsolings
againststandard flooring materials,orflooring materialsagainst
standard solings. Each machine is supplied d with a standard,
calibratedfloorsurface.Additionalsurfacesareavailableandalmost
anyfloorsurface,whichcanbeattachedtothemachine,canbe
used.
Determiningfrictionorslipresistanceisacomplexprocessrequiring
careful and accurate monitoring of numerous s parameters s in a
relativelyshorttime.Acomputer,housedin the controlconsole,
managesdataacquisitionandprovidesagraphicrepresentationof
thetestdataandcoefficientoffriction(CoF)foreachsampletested.
Thisisachievedthroughconstant,closecontrolofforcesandmotion
speedviaavariable-speedmotoranduniquecircuitrydesign.Test
resultsaredisplayedasafourline,captionedgraph,representing
vertical load, speed of table movement, horizontal load, and
coefficientoffriction.
Teststandardsplacegreatimportanceonthetimingandmethodof
obtainingresults.TheuniqueSATRAsoftwarecontrolsthemachine
andmanipulatesdatagatheredduringthetest.Itensuresaccurate
controloftheentireprocedure,strictlyinaccordancewiththetest
standardparameters.Principaltests,SATRATM144,ENISO13287
andASTMF2913-11,arepre-setinthesoftwareincludedwiththe
machine. Users mayalso o add their own test t standards. These
settingscanbesavedandrecalledforrepeattesting.Teststandards,
includinguser-definedsettings,canbeselectedfromadrop-downlist
tosimplifyoperation.Basedontheuserʼsselections,themachineis
pre-settotherequiredspeeds,delays,andpoint(snapshot)atwhich
theCoFiscalculated.Tosafeguardqualitycontrol,essentialdata
mustbeenteredbeforenewtestscanproceed.Theoperatorʼsname,
teststandard,testsurfaceandallotherrelativedataarerecorded.
Aunique function of the SATRAsoftware is s itsself-teach h mode
appliedduringtesting.Verticalloadismonitoredduringeachtestand
adjustedforthefollowingtestifrequired,ensuringtheverticalload
isalwayscorrect.
STM603Slipresistancetester
46
31
Stiffness
Tensiletesting
Inbio-mechanicaltrialsorganisedbySATRA,runninginastiffshoewasfoundtoinvolvemore
muscleactivityinthelowerlegand5percentgreaterenergyusagethaninaflexibleshoe.
Longitudinalflexibility,therefore,isadesirablepropertyforsportsshoesandespeciallyrunning
shoes.Flexibilityisalsodesirableinchildrenʼsfootwear,whereunduestrainshouldnotbe
placeduponthestill-growinganddevelopingfoot.
Inoperation,thefootwearisflexedaboutadefinedlinedrawnacrosstheforepart,thebending
momentrequiredtoflexthefootwearandthemaximumangleachievedarerecordedandused
tocalculatetheSATRAstiffnessindex.
Torsionalstiffnessisameasureoftheresistancetotwistingoffootwearaboutitslongitudinal
axis.Thefootwearisclampedinthetoearea,forcesareappliedthroughtheheelclampsuch
thattheheelandbackpartistwistedfirstinwardsandthenoutwardsuptoamaximumangle.
Thetorquerequiredtoachievethetwistisusedtocalculatethetorsionalstiffnessvalues.
STM507Dynamicfootwearstiffnesstester
Thisgeneralpurposemachinehasbeendesignedtomeasurethestrengthandstretchofa
varietyof shoe materialswith h an accuracysufficient t for manyrequirementsof the shoe
manufacturers.Itiseasytouseandtheloadandextensionvaluescanbeeasilyread.The
instrumentissuitablefortestingmostshoematerialsiftheloaddoesnotneedtoexceed150lb
or68kgandtheextension100%.
ThemachinecanalsobeusedfortheBaumannteartestandjawsSTD172ST,tosuitthistest,
areillustratedinthephotographright.Thesejawsneedtobeorderedseparately.
Inuse,astripofthematerialbeingtestedisclampedbetweentwojaws,initiallyfourinches
(10cm)apart,whichareseparatedbyahanddrivetoapplyincreasingtension.Onejawisfixed
toacantileverbeam.Thedeflectionoftheendofthebeamisproportionaltotheappliedload
andismeasuredbyadialgaugecalibratedtogivetheloaddirectly.Thedialgaugeisfittedwith
amaximum-readingdevicetomakeiteasytomeasurebreakingloads.Thesecondjawmoves
overascalewhichgivestheextensionasapercentage.
STD172Simpletensiletester
Stateofcure
Thisdeviceisusedformeasuringvariationsinthedegreeofcureinmoulded-onrubbersoles
throughouttheirthickness.
Thetestprocedureisbasedonthefactthathardnessvariesinmostrubbers,accordingtothe
stateofvulcanisation.
Theresistancetoindentation,whichisdeterminedbythehardnessoftherubber,ismeasured
atseveralpositionsthroughthethicknessofasampletakenfromadefinedpositionedinthe
soleorheel.Thesamplerestsonavibratingplateandanindentorisloweredontoit.After10
seconds,thedialgaugeissettozeroandtheindentorisloaded.Afterafurther15secondsthe
depthonindentationisreadfromthedialgauge.
Thereadingsofindentationdepthareplottedagainsttheirposition,relativetotheinnerand
outersurfacesofthesole,andacurveindicatingthecureofthesoleisdrawn.Fromthisgraph
theamountofʻundercureʼneartheinnersurfaceofthesolecanbecalculated.
Theequipmentconsistsofadialgauge fittedwitha60°conicalendtotheplungeranda
removable500gweight,allmountedonanelectrically-vibratedbaseplate.
STM135Stateofcuretester
49
32
Tensiletesting
SATRAʼstensiletestersarerobusttwincolumnmachineswithreliablemechanicalattributesand
incorporatedigitalsoftwarecontrol.Themachinesdeliverprecisionperformancethroughhigh
efficiencypre-loadedballscrews,highresolutionloadcellsanddigitalACservodrive.The
machinesoperateinbothtensionandcompressionmodesandprovideupto8timesoverload
capacitywithoutdamagetotheloadcell.
Thesoftwareprovidedrunsfromacomputer(notsupplied)andisuserfriendlywithlargedisplay
pagesforinputtingdata.
This software allows the e operator r to load test methods s required d or r to create specific
requirementsforindividualtests.Displaysandreportscanbecustomisedwithforexample,
specificheadingsorcompanylogos.
TheSTM566machine typicallyhasaload capacityof5kNorlesswhereastheSTM766
typically has s a a load capacity of f 20kN. This higher capacity is particularly relevant for
compressiontestingof,forexample,safetytoecaps.
Bothmachinesoccupythesamefootprintandarangeoftest-specificjawsisavailableupon
requestfromSATRA.
STM566/STM766Tensiletesters
STM566Tensiletestingmachineaccessories
STM566SB
STM566H
STM566F
STM566TB
This specially shaped 'C'
clampisnormallyusedinthe
peel strength testing of
footwearsoletoupper.Itcan
also be used as s a a general
purposeclamp.
Topclamp provided(usedin
conjunction with 566F or
566QRbottomclamp).
This attachment is used d to
determine the
heel pin
holdingstrengthoffootwear
insole board, particularly in
theseatregion.
Suppliedasacompleteunit.
Thisisaversatile,standard,
flatjaw,usedforavarietyof
generalpurposeclamping.
Sold individually(normallya
pairwouldberequired).
TheseSATRAthreadbollards
are used to determine the
breakingloadofthreadsand
laces.
Suppliedasapairofjaws.
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