ASTM D8041 D8041M-2016 0993 Standard Test Method for Whole Boot Breathability (MVTR)《整靴透气性的标准试验方法(MVTR)》.pdf

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1、Designation: D8041/D8041M 16Standard Test Method forWhole Boot Breathability (MVTR)1This standard is issued under the fixed designation D8041/D8041M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A numb

2、er in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 The whole boot breathability test method is designed toindicate the Moisture Vapor Transmission Rate (MVTR)through the boot upper by means

3、of a difference in temperatureand moisture vapor concentration between the interior of theboot and the exterior environment. This method is intended fora size 10 R U.S. (Regular width) boot that is at least 6 in. 15.2cm tall above the insole1.2 The values stated in either inch-pound units or SI unit

4、sare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system is tobe used independently of the other, without combining valuesin any way. Combining values from the two systems may res

5、ultin non-conformance with the standard.1.3 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

6、limitations prior to use.2. Terminology2.1 Definitions:2.1.1 boot, nfootwear in which the upper reaches abovethe ankle.2.1.2 eyelet, ntextile, metal or plastic reinforcementsaround the holes which carry the lace.2.1.3 foot form assembly, nrelating to this test method, thefoot form consists of boot p

7、lug with copper tubing in a shapeof a foot.2.1.4 footwear, nwearing apparel for feet (such as shoes,boots, slippers).2.1.5 gusset, nthe part of the vamp that extends over theinstep of the foot between the eyestays and allows expansionsof the opening at the top of the footwear.2.1.5.1 DiscussionFor s

8、lip-on footwear this may includean elastic gusset that allows expansion at the opening at the topof the footwear.2.1.6 heel, nthe part of the boot which supports the backpart of the foot.2.1.7 insert, nremovable foot bed which is shaped ormolded to match the approximate contour of the bottomsurface

9、of the foot.2.1.8 plug, na circular or oval shaped (non metallic) bootplug that holds the (copper foot form) water heating assemblyand seals the top of the water holding bootie insert and upperat the water interface. The plug must be made from materialthat is impervious to both liquid water and wate

10、r vapor.2.1.9 sole or outsole, nthe bottom layer of the footwear,including the heel, in contact with the ground forming thewalking surface.2.1.10 upper, nthe entire part of the footwear locatedabove the sole. Includes external leather and synthetic materi-als as well as internal linings.2.1.11 water

11、 holding bootie insert (WHBI), na thin,flexible, waterproof, breathable bootie meeting the require-ments of 6.3.3. Summary of Test Method3.1 A test sample boot fitted with a water holding bootieinsert (WHBI) is filled with preheated water and weighed. Thewater is kept at a constant temperature for 6

12、 h and then the boot(with water) is reweighed. The loss in weight is used tocalculate the Moisture Vapor Transmission Rate (MVTR) ofthe footwear, otherwise known as breathability.4. Significance and Use4.1 The materials and construction methods used in themanufacture of footwear play a significant r

13、ole in the “breath-ability” of the footwear. This test method provides a means tomeasure moisture vapor permeability, expressed as MVTR,which is one aspect of comfort of the footwear.5. Interferences5.1 Temperature, humidity or air movement fluctuations.6. Apparatus6.1 The external test environment

14、control system shall becapable of maintaining 73 6 2 F 23.0 6 1.0 C and 50 6 2% relative humidity throughout the test duration.1This test method is under the jurisdiction ofASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.03 on Footwear.Current edition approved Sept.

15、 1, 2016. Published November 2016. DOI:10.1520/D8041_D8041M-16.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 The weight scale shall be capable of determining weightof boot, plus foot form assembly and WHBI filled with waterto an

16、 accuracy of 60.1 g.6.3 The WHBI shall be flexible so that it can be inserted intothe boot and conform to the interior contours; it must be thinenough so that folds do not create air gaps. The WHBI must bewaterproof so that only moisture vapor can penetrate throughthe bootie, rather than liquid wate

17、r. Check the WHBI forleakage before each test by filling the interior with water andvisually looking for water moisture on the exterior surface. AWHBI should only be used for five 6-h tests, including the firstconditioning test (see 11.2).6.4 The foot-form assembly used with the water circulatingsys

18、tem is constructed of - or38-in. 6 mm or 10 mm ODcopper tubing passing through the boot plug. (See the criticaldimensions for the diameter, horizontal and vertical tubinglengths in Fig. 1.) The tubing is measured from the bottom ofthe plug surface to the end of the elbow or bend.6.5 The boot plug (F

19、ig. 2) shall be circular shaped measur-ing 3-12 in. diameter by 2-12 in. thick 612 in. 89 mmdiameter by 64 mm or an oval 2-12 in. wide by 3-12 in. longby 2-12 in. thick 64 by 89 by 64 mm, nonmetallic, andimpervious to water vapor and liquid water.NOTE 1Critical measurements are plug thickness and en

20、suring probeis 1 in. 2.54 cm from inside edge of tubing.6.5.1 In addition, the boot plug shall have a water fillinghole with stopper and at least one temperature probe, (6.6)which will be used to monitor the internal water temperature inthe WHBI at the toe area of the boot (see Fig. 1). The foot for

21、massembly is detachable from the water circulating system (6.7)to facilitate weighing. Both the inlet and outlet lines from thefoot form assembly to the water circulating system shall consistof clear tubing, each marked with a line or alternate means toensure the water volume within the system is co

22、nstant duringweighing.6.6 There is one temperature probe (see Fig. 1) which isinserted into the top of the boot plug and reaches to the toe areaof the boot. It cannot be wrapped around, or come in contactwith, the copper tubing. Note that all tubes, hoses or linesrunning through the plug shall be se

23、aled to prevent vapor fromescaping.6.7 The water circulating system (see Fig. 3) for the bootshall be capable of controlling the temperature of the water inthe boot uniformly at 95 6 2F356 1 C when measuredwith the temperature probe, without touching the WHBI orwater circulating apparatus. (See Fig.

24、 1).6.8 A stationary 6-in. 15.2 cm diameter fan shall be usedto create the specified air current past the boot.6.9 The stationary fan shall be positioned perpendicular tothe test surface, aimed at the toe of the boot, and be raised sothe center of the fan is 5 in. 12.7 cm above the base of the testp

25、latform.6.10 The air current origin shall be 15.5 in. 39.4 cm fromthe back heel edge of the boot (D). Refer to Fig. 4.6.11 The wind speed shall be 250 6 30 ft/min 1.3 60.15m/s at the heel edge of the boot (S) as measured with a 2.8-in.7.1 cm diameter fan anemometer. Measurement shall betaken without

26、 the boot assembly in place, utilizing a holdingdevice to support the 2.8-in. 7.1 cm diameter fan anemometerperpendicular to the test platform. The center of the anemom-eter shall be 2 in. 5 cm above the base of the test platform and15.5 in. 39.4 cm from the fan.7. Whole Boot Breathability Bench-top

27、 Set-up7.1 DDistance from the boot heel back edge to fansurface.7.2 SWind speed at boot heel back edge.7.3 If there is more than one station, a divider wall must bebetween them. Divider walls shall be a minimum of 4 in. 10cm from the center line of the fan box, equal in height to thefan box, and ext

28、end from the fan box to the back of the testplatform.7.4 The fan box may need baffles, an adjustable rheostat ora variable autotransformer to meet requirements for the aircurrent to be 250 6 30 ft/min 1.3 6 0.15 m/s.8. Reagents and Materials8.1 Distilled or deionized water.9. Water Holding Bootie In

29、sert (WHBI) Test9.1 Weigh WHBI to accuracy of 60.1 g. This is the originalweight and used if the test is aborted to verify the WHBI is drybefore using it for testing.9.2 The top of the WHBI shall be sealed around thefoot-form assembly plug using boot laces or hook and loopbundling tape. A stand and

30、clamp can be used to help hold theWHBI upright (see Fig. 5). Fill with distilled or deionizedwater preheated to 95 6 2 F 35 6 1 C to just past thebottom of the plug.9.3 Check the WHBI for any leakage before continuing thetest. If any moisture is observed on the exterior surface, the testmust be rest

31、arted with a new WHBI.9.4 Weigh the entire assembly and record as Wi. The watervolume in the tubing system shall be noted at the time ofweighing, by a visual mark or alternate means of ensuringconstant water volume. The volume of water in the tubingsystem shall be the same at the start and end of th

32、e test toprevent any effect on the weight loss calculation.NOTE 2You may need to add or remove water from the tubing systemin order to ensure it is the same volume.9.5 After weighing, connect the water circulating systemand maintain the temperature in the WHBI at 95 6 2F3561 C for 1 h 6 5 min.NOTE 3

33、Water circulating system may need adjusting to maintainconstant temperature in WHBI.9.5.1 Check the temperature every 15 min. If found out oftolerance, abort the test. If testing apparatus is capable oftesting more than one WHBI at a time, the temperature of eachWHBI shall be checked.D8041/D8041M 16

34、2FIG.1DimensionsforDiameter,HorizontalandVerticalTubingLengthsSOURCE:WolverineWorldWideD8041/D8041M 163FIG.2BootPlugSOURCE:WolverineWorldWideD8041/D8041M 164FIG. 3 Water Circulating SystemFIG. 4 Air Current OriginD8041/D8041M 1659.6 The WHBI assembly shall be oriented such that thebottom of WHBI sit

35、s flat on the testing surface and the heel ofthe WHBI is furthest from the fan and in line with the center ofthe fan (see Fig. 6).9.7 After1h(65 min) disconnect bootie assembly from thewater circulating system and reweigh WHBI assembly as Wf.The volume of the water in the tubing system shall be the

36、sameat the start and end of the test to prevent any effect on theweight loss calculation. Compute MVTR in g/h:MVTR of WHBI 5Wi2 Wf!1h(1)FIG. 5 Stand and ClampFIG. 6 Whole Boot Breathability Bench-top Set-up with WHBID8041/D8041M 166where:Wi= initial weight of entire WHBI assembly, andWf= weight afte

37、r1hofWHBIassembly.10. Sampling, Test Specimens, and Test Units10.1 One boot is considered to be one specimen.10.2 Sample boot size should be mens 10 R. Rregularwidth.11. Conditioning11.1 The boot specimens shall be conditioned at 73 6 2F23.0 6 1.0 C and 50 6 2 % relative humidity in the testenvironm

38、ent for a minimum of 12 h before testing.11.2 Any new WHBI shall be conditioned once by runningthrough the complete 6-h test and the results discarded. Thismay be accomplished as a bootie test (see Section 9)for6horusing a dummy boot.12. Procedure12.1 If the footwear specimen has a removable cushion

39、insert (foot bed), it shall be placed properly in the bootspecimen. (This may reduce results if not positioned correctly.)12.2 Weigh boot sample after conditioning a minimum of12hat736 2 F 23.0 6 1.0 C and 50 6 2 % relativehumidity and record as Wo(this will be the conditionedweight).12.3 Check the

40、WHBI for leakage before each test by fillingwith water and visually looking for water moisture on theexterior surface. Empty WHBI before inserting in footwearspecimen. Discard WHBI that exhibit leakage.12.4 There are two options for preparing specimen fortesting.12.4.1 Option 1Insert WHBI (no moistu

41、re on outside ofthe WHBI) into boot, flatten out with hand (a glove may help)as best as possible and then place foot form into WHBI, thefoot form should be resting on the insert (foot bed) or sockliner. Boots should be laced to the top of the lacing system.Allow for 1 6 0.5 in. 25.4 6 12.7 mm separa

42、tion betweeneyelet rows, with the possible exception of the eyelets at thetop of the boot and boot plug area being tied to maximize sealsecurity at top of boot. Secure the WHBI and boot to the plugusing a boot lace (Fig. 7) or a hose clamp (Fig. 8) around theoutside of the boot at the height of the

43、plug. If using the hoseclamp, the torque should not exceed 25 in.-lb 2.8 Nm(66 %).NOTE 4Do not tape, saran wrap or close off the top of boot).Be sure there is some slack in the WHBI so that it can fullyform to the interior of the footwear specimen.12.4.2 Option 2Secure the WHBI to the foot form at t

44、heplug using hook and loop bundling tape. The loop should facethe bootie and the reverse hook covered with another piece ofloop to prevent attaching to the inside of the boot. Boots shouldbe laced to the top of the lacing system. Allow for 1 6 0.5 in.25.4 6 12.7 mm separation between eyelet rows, wi

45、th thepossible exception of the eyelets at the top of the boot and bootplug area being tied to maximize seal security at top of boot.The top of the boot shall be sealed around the boot plug byeither a boot lace (Fig. 7) or a hose clamp (Fig. 8) around theoutside of the upper at the height of the int

46、erior boot plug.NOTE 5Do not tape, saran wrap or close off the top of boot.If using the hose clamp, the torque should not exceed 25in.-lb 2.8 Nm (66 %).12.5 Fill with distilled or deionized water preheated to95 6 2F356 1 C to just past the bottom of the plug. Holdboot at an angle with toe towards ta

47、ble, tap boot several timesto remove any trapped air in WHBI. Check to make sure wateris still just past the bottom of boot plug. Add distilled ordeionized water if necessary and plug the access hole.12.6 Weigh entire boot assembly and record as Wi. Thewater volume in the tubing system shall be note

48、d at the time ofweighing, by visual mark or alternate means of ensuringconstant water volume. The volume of the water in the tubingsystem shall be the same at the start and end of the test toprevent any effect on the weight loss calculation.12.7 After weighing, connect water circulating system. Star

49、ttiming the test once the water temperature in the bootie isverified to be 95 6 2F356 1 C. Abort test if correcttemperature is not reached in 15 min. Maintain the temperaturein the boot at 95 6 2F356 1Cfor6h(65 min). Checktemperature between hours 2 and 4 and at the end. If found outof tolerance, abort the test. If testing more than one boot in aseries, each boot shall be checked12.8 The boot assembly shall be oriented such that the bootsole lies flat on the testing surfac