1、Designation: F450 13 An American National StandardStandard Test Methods forVacuum Cleaner HoseDurability and Reliability (Plastic)1This standard is issued under the fixed designation F450; the number immediately following the designation indicates the year of originaladoption or, in the case of revi
2、sion, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods cover the determination of the effectof anticipated stresses and strains that vacuum
3、cleaner andextractor hoses will receive in normal use.1.2 These test methods apply to plastic (regular and rein-forced) vacuum cleaner and extractor hoses for household use.1.3 The following tests are included:SectionTorsional flex 6Hot and cold flex with aging 7Abrasion, external surfaces 8Flex 9Pu
4、ll test on hose fittings with aging 10Crush 11Stretch ratio 12Extractor hoses 131.4 These test methods are individual tests as agreed uponbetween the hose and vacuum manufacturer.1.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematical
5、conversions to SI units that are provided for information onlyand are not considered standard.1.6 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 pra
6、ctices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D638 Test Method for Tensile Properties of PlasticsD695 Test Method for Compressive Properties of RigidPlasticsF395 Terminology Relating to Vacuum CleanersF595 Test Methods for V
7、acuum Cleaner HoseDurabilityand Reliability (All-Plastic Hose) (Withdrawn 2010)33. Terminology3.1 DefinitionsRefer to Terminology F395.4. Significance and Use4.1 These test methods can be used by buyers of vacuumcleaner hose to specify the test criteria the hose must meet tobe acceptable for their p
8、urposes.5. Sampling5.1 The sample size shall be one that is mutually agreedupon between the hose manufacturer and the vacuum cleanermanufacturer.TEST METHODS6. Torsional Flex Test6.1 ScopeThis test method covers the determination of theadhesion of the reinforcement wire coating to the hose jacket,th
9、e jacket strength, and the strength of the reinforcement wirefor plastic hose with inside diameter from 1 to 2 in. (25 to 51mm).6.2 ApparatusThe apparatus shown in Fig. 1 is suitablefor this test method with the following provisions:6.2.1 Means to rotate test mandrel in a horizontal plane at 206 1 r
10、pm, both clockwise and counter-clockwise.6.2.2 Test weight of 48 6 1 oz (1360 6 28 g) with provisionto attach to sample hose.6.2.3 Suitable clamp to attach sample hose to mandrel thatretains the hose without causing failure at the clamp during thetest.6.2.4 Test mandrel with diameter same as inside
11、diameter ofhose with 0.078 in. (2.0 mm) radius at the ends of the mandrel(see Fig. 1).6.2.5 Guide for weight to prevent hose sample from swing-ing during test cycle.6.2.6 Instrument to measure cycles to failure or to a speci-fied end point.1These methods are under the jurisdiction of ASTM Committee
12、F11 on VacuumCleaners and are the direct responsibility of Subcommittee F11.30 on Durability-Reliability.Current edition approved May 1, 2013. Published June 2013. Originallyapproved in 1979. Last previous edition approved in 2009 as F450 09. DOI:10.1520/F0450-13.2For referenced ASTM standards, visi
13、t the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright AST
14、M International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.3 Test SpecimenThe specimen shall be a length of hose24 6 1 in. (610 6 25 mm) without fittings.6.4 ConditioningCondition the specimens at an ambienttemperature of 68 to 81F (20 to 27C) for not less
15、 than 1 hprior to test.6.5 Procedure:6.5.1 Conduct the tests at 68 to 81F (20 to 27C).6.5.2 Clamp the specimen to the test hose mandrel as shownin Fig. 1 and attach a weight to other end of hose sample.6.5.3 Set measuring instrument at zero or record the initialreading.6.5.4 Test half of the specime
16、ns by rotating clockwise andthe other half by rotating counter-clockwise at 20 6 1 rpm untilfailure or to a specified end point.6.5.5 Failure may be evidenced by a broken reinforcingwire, tear, or hole that penetrates the hose jacket, or a collapsedcoil or ply for a lined-type hose, or any combinati
17、on thereof.6.5.6 Additionally, breaking or damaging of the conductors,or an increase of more than 10 % of the conductor resistance,is considered to be a failure for current-carrying hoses.7. Hot and Cold Flex Test with Aging7.1 ScopeThis test method covers the determination of theeffect of temperatu
18、re and flexing upon a hose sample withinside diameters from 1 to 2 in. (25 to 51 cm).7.2 Apparatus:7.2.1 Air-Circulating Oven or Environmental Chamber, tomaintain 156F (69C) controlled to 62F (61C).7.2.2 Cold BoxAcold box able to maintain 20F (6.7C)controlled to 61F (60.5C).7.3 Test SpecimenThe spec
19、imen shall be a length of hosein which the length in inches or millimetres shall be determinedas follows:11.2 3inside diameter, in inches12 in.11.2 3inside diameter, in millimetres151 mm!7.4 ConditioningCondition the specimens at an ambienttemperature of 68 to 81F (20 to 27C) for not less than 1 hpr
20、ior to test.7.5 Procedure:7.5.1 Bend a specimen in a “U” shape and tie the endstogether at a position 1 in. (25 mm) from the ends as shown inFig. 2.7.5.2 Place the specimen into the oven, which has beenbrought to a steady test temperature of 156 6 2F (69 6 1C),and soak the sample for 2012 h.7.5.3 Re
21、move the specimen from the oven and allow 30 minfor samples to come to ambient temperature in accordance with7.4.7.5.4 Next, place the specimen in the cold box, which hasbeen brought to a steady temperature of 20 6 1F (6.7 60.5C) for 2 h.7.5.5 Remove the specimen from the cold box, untie andimmediat
22、ely flex it 360, three times, 1 s per flex, as shown inFig. 3.7.5.6 Failure may be evidenced by a tear or hole thatpenetrates the hose jacket to cause air leak, or a collapsed coilor ply for a lined-type hose, or any combination thereof.Reinforcement wires that pull away or holes worn in outerjacket
23、 that do not cause air leaks are not determined to befailures.7.5.7 Retie the hose in its original position.7.5.8 Allow 1 h for conditioning as specified in 7.4 beforestarting next cycle.7.5.9 The steps covered in 7.5.1-7.5.8 constitute one cycle.Conduct this complete cycle of tests for four success
24、ive days,then permit the specimens to remain at ambient conditions forthe unused balance of a 7-day period, then repeat until a failureoccurs or until a specified end point is reached, whicheveroccurs first.7.6 ReportThe report shall include the following:7.6.1 Number of cycles to failure or to a sp
25、ecified end point,whichever occurs first,7.6.2 Condition of the specimen,7.6.3 Ambient test temperature,7.6.4 Description of specimen, and7.6.5 Number of specimens tested.FIG. 1 Schematic for Torsional Flex TestF450 1328. Abrasion Test of External Surface8.1 ScopeThis test method measures the wear c
26、haracter-istics of a vacuum cleaner hose subjected to an abrasivesurface.8.2 Apparatus:8.2.1 Special Abrasion Test Fixture, as described in Fig. 4 toproduce a rate of 20 6 1 cycles/min.8.2.2 Cylindrical Segment, as described in Fig. 5.8.2.3 Test Weight, 16 6 1 oz (454 6 3 g) with provision toattach
27、to the specimen.8.2.4 Abrasive Paper, wet-dry, 500-grit, for abrasion testsurface.48.2.5 Instrument, to measure cycles to failure or to aspecified end point.8.2.6 Weight Guide, to prevent weight from swinging duringtest cycling.8.2.7 Clamps, suitable for attaching the hose to the mecha-nism coupling
28、 on one end and attaching the weight to the otherend without causing failure of the hose at these clamps.8.3 Test SpecimenThe specimen shall be a full lengthhose, or a length of hose suitable for the test unit.8.4 ConditioningCondition the specimen at 68 to 81F (20to 27C) ambient temperature for not
29、 less than 1 h prior to test.8.5 Procedure:8.5.1 Conduct the tests at 68 to 81F (20 to 27C).8.5.2 Clamp a new sheet of standard wet-dry, 500-gritabrasive paper to the cylinder.8.5.3 Clamp the specimen to the mechanism coupling.Attach the weight and place in the weight guide. The weightshall be in fr
30、ee suspension throughout the cycle.8.5.4 Set the measuring instrument to zero or record startingvalue.8.5.5 Cycle the specimen against the surface of the abrasivepaper until failure of jacket or to a specified end point.8.5.6 Failure may be evidenced by a tear or hole thatpenetrates the hose jacket
31、to cause air leak, or a collapsed coilor ply for a lined-type hose, or any combination thereof.Reinforcement wires that pull away or holes worn in outerjacket that do not cause air leaks are not determined to befailures.8.5.7 Additionally, exposure of the bare conductor wire isconsidered a failure i
32、n a current-carrying hose.8.6 ReportThe report shall include the following:8.6.1 Number of cycles to failure or to a specified end point,whichever occurs first,8.6.2 Description of failure,8.6.3 Ambient test temperature,8.6.4 Description of specimen, and8.6.5 Number of pieces tested.9. Flex Test9.1
33、ScopeThis test method covers the determination of thevacuum cleaner hose resistance to bending under an appliedstress.9.2 Apparatus:9.2.1 Special Abrasion Test Fixture, as described in 8.2.1and Fig. 4 except with driving arm rotating at 36 6 1cycles/min and the cylindrical segment replaced with pull
34、ey(9.2.2).9.2.2 Pulley, a cold-rolled steel (or similar) grooved pulleyas described in Fig. 6.9.2.3 Test Weight, 160 6 1 oz (4536 6 28 g) for reinforcedhoses and 80 6 1 oz (2268 6 28 g) for plastic hoses withprovision for attaching to the specimen.9.2.4 Weight Guide, to prevent weight from swinging
35、duringtest cycling.9.2.5 Instrument, to measure cycles to failure or to aspecified end point.9.2.6 Clamps, suitable for attaching the hose to the mecha-nism coupling on one end and attaching the weight to the otherend without causing failure of the hose at these clamps.9.3 Test SpecimenThe specimen
36、shall be a full lengthhose, or a length of hose suitable for the test unit.9.4 ConditioningCondition the specimen at 68 to 81F (20to 27C) ambient temperature for not less than 1 h prior to test.9.5 Procedure:9.5.1 Conduct tests at 68 to 81F (20 to 27C).9.5.2 Clamp the specimen to the mechanism coupl
37、ing.Attach the weight and place in weight guide. The weight shallbe in free suspension throughout the cycle.9.5.3 Set the measuring instrument to zero or record thestarting value.9.5.4 Run the test until failure or until a specified end pointis reached, whichever occurs first.9.5.5 Failure may be ev
38、idenced by a tear or hole thatpenetrates the hose jacket to cause air leak, or a collapsed coilor ply for a lined-type hose, or any combination thereof.4Wet-dry, 500-grit, Tri-M-Ite Abrasive Paper, available from 3M Co., St. Paul,MN, has been found suitable for this purpose.FIG. 2 Hose Position Duri
39、ng Heat and Cold SoakFIG. 3 Hose Flex CycleF450 133Reinforcement wires that pull away or holes worn in outerjacket that do not cause air leaks are not determined to befailures.9.5.6 Additionally, breaking or damaging of the conductors,or an increase of more than 10 % of the conductor resistance,is c
40、onsidered to be a failure for current-carrying hoses.FIG. 4 Abrasion and Flex Test Fixture (Abrasion Set Up Shown)FIG. 5 Cylindrical Segment (Abrasion Test)FIG. 6 Pulley Flex Test FixtureF450 1349.6 ReportThe report shall include the following:9.6.1 Number of cycles to failure or specified end point
41、,whichever occurs first,9.6.2 Type of failure,9.6.3 Ambient test temperature,9.6.4 Description of specimen, and9.6.5 Number of pieces tested.10. Pull Test on Hose Fittings with Aging10.1 ScopeThis test method covers the determination ofthe ability of the vacuum cleaner hose fitting connection towith
42、stand maximum forces during use.10.2 Apparatus:10.2.1 Oven and Cold Box, as specified in 7.2,10.2.2 Total Test Weight, in 80 6 0.5-oz (2268 6 14-g)increments.10.2.3 Testing Machine (alternative to the dead weight)Aproperly calibrated machine of the constant-rate-of crossheadmovement type meeting the
43、 requirements of Test Method D638(see 10.5.3 for tension method).10.3 Test SpecimenThe test specimen shall be a 1-ft(0.3-m) long section from each end of the hose containing thecleaner attachment fittings, or the hose fittings, or both. Itslength shall conform to the requirements of 10.5.3.1 if thet
44、ensile machine test method is used.10.4 ConditioningPrior to test on fittings, age the speci-mens by performing the following heat/cold soak.10.4.1 Place the specimen, in straight configuration, in anair-circulating oven at 156 6 2F (69 6 1C) for 2012 h.10.4.2 Remove the specimen from the oven and a
45、llow 30min for the specimens to come to equilibrium with ambienttemperature 68 to 81F (20 to 27C).10.4.3 Place the specimen in cold box at 20 6 1F (6.7 60.5C) for 2 h.10.4.4 Remove the specimens from the cold box and allow1 h for them to return to ambient temperature before conduct-ing the pull test
46、.10.5 Procedure:10.5.1 Conduct the tests at ambient temperature of 68 to81F (20 to 27C).10.5.2 Dead Weight Method:10.5.2.1 Clamp the fitting of the specimen to the deadweight.10.5.2.2 Holding the hose, lift the weight slowly. Hold offthe floor for 1 min.10.5.2.3 With dead weight hold 1 min, otherwis
47、e pull untilfailure with increasing load on the fitting in 80-oz (2268-g)increments.10.5.2.4 Test both ends.10.5.3 Tension Testing Machine Method:10.5.3.1 Select a specimen length short enough so that theend treatment is pulled off before the hose stretches the entiredistance of travel of the instru
48、ment.10.5.3.2 Fasten both ends of the hose firmly in the machine.10.5.3.3 Stretch the sample at the rate of 0.50 6 0.2 in.(12.7 6 6.1 mm)/min until the hose pulls away from the fitting.Note the force applied.10.5.3.4 Repeat the test with slightly decreasing amounts offorce until the greatest force a
49、pplied to the sample for 1 minwithout pulling the fitting from the hose is reached. Note thisvalue.10.5.3.5 If the hose failure occurs before either the fitting orfitting to hose bond, report as hose failure and note the loadapplied.10.6 ReportThe report shall include the following:10.6.1 Maximum weight or load supported without failure,10.6.2 Location of failure,10.6.3 Ambient test temperature,10.6.4 Hose and fitting description, and10.6.5 Number of specimens tested.11. Crush Test (Relaxed and Stretched)11.1 Sco
