TL_82324_Englisch
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Group standardTL 82324Issue 2013-06Class. No.:8ME00Descriptors:tubing, heat-shrink tubing, cable, water-tightHeat-Shrink Tubing Functional RequirementsPrevious issuesTL 82324: 1993-06, 2008-04ChangesThe following changes have been made to TL 82324: 2008-04:–Section 2.7 revised –Section 2.8 revised –Section 3.2.2 revised –Section 3.3 revised –Section 3.4 revised –Section 3.9 revised ContentsPageScope .........................................................................................................................2Requirements .............................................................................................................2Basic supply requirements .........................................................................................2General information ....................................................................................................2Technical specification for material ............................................................................2Application-related requirements ...............................................................................3Physical properties .....................................................................................................3Dimensions ................................................................................................................3Color ...........................................................................................................................4Marking ......................................................................................................................4General requirements for the shrinking process .. (4)122.12.22.32.42.52.62.72.82.9Always use the latest version of this standard.This electronically generated standard is authentic and valid without signature.The English translation is believed to be accurate. In case of discrepancies, the German version is alone authoritative and controlling.Numerical notation acc. to ISO/IEC Directives, Part 2.Page 1 of 12All rights reserved. No part of this document may be provided to third parties or reproduced without the prior consent of one of the Volkswagen Group’s Standards departments.© Volkswagen AktiengesellschaftVWNORM-2012-05oPage 2TL 82324: 2013-06Connection requirements ...........................................................................................4Tests ..........................................................................................................................4General information ....................................................................................................4DUTs ..........................................................................................................................4Preparation of DUTs ..................................................................................................5Conductor insulation of DUTs ....................................................................................5Leak tightness/insulation resistance ..........................................................................5Splices (crimped – ultrasonic-welded) ........................................................................5Cable lugs ..................................................................................................................6Over-pressure test .....................................................................................................6Vacuum test ...............................................................................................................6Thermal aging ............................................................................................................7Thermal overload test ................................................................................................7Thermal shock test .....................................................................................................7Environmental cycle test ............................................................................................7Hot pressure test ........................................................................................................7Low-temperature impact strength ..............................................................................8Abrasion resistance ....................................................................................................9Resistance to operating materials ............................................................................10Fuel resistance .........................................................................................................10Engine oil resistance ................................................................................................10Transmission fluid resistance ...................................................................................10Shear strength ..........................................................................................................11Applicable documents ..............................................................................................112.1033.13.1.13.1.23.1.33.23.2.13.2.23.2.2.13.2.2.23.33.43.53.63.73.83.93.103.10.13.10.23.10.33.114ScopeThis standard contains requirements and tests for heat shrink tubing and connections sealed with it.It applies to plastic heat shrink tubing with an inner layer of thermoplastic adhesive (hereinafter re‐ferred to as "heat shrink tubing"), that is used to insulate electrical connections in a waterproof manner.RequirementsBasic supply requirementsApproval of first supply and changes as per VW 01155.Avoidance of hazardous substances as per VW 91101.General informationElectrical connections must be made by crimping, welding, splicing, or by means of mounted con‐tact parts such as tubular cable lugs, ring cable lugs, etc.Technical specification for materialIf available, information regarding the material and material properties of the heat shrink tubing and adhesive as individual components, as well as a heat shrink tubing/adhesive combination, must be obtained from the pertinent Technical Supply Specifications (TLs) or the drawing.12 2.12.22.3Page 3TL 82324: 2013-06Application-related requirementsSee table 1.Table 1Physical propertiesThe heat-shrink tubing must be free of defects in the as-received condition. Cracks, holes, gaseous or solid inclusions, uneven adhesive coatings and oblique cut edges are not permissible.DimensionsThe length and diameter of the heat shrink tubing to be used must be matched to the connection type (characterized by cross-section and number of conductors).The supplier must specify and document guidelines for the diameter of the heat shrink tubing that is suitable for a connection.The tube length must be chosen such that the heat shrink tubing overlaps the conductor insulation by at least 10 mm on each end after the shrinking process.2.4 2.52.6Page 4TL 82324: 2013-06ColorBefore and after the shrinking process, the heat shrink tubing must be transparent enough that the connection in the tubing can be accurately positioned and tested.MarkingEvery heat shrink tubing must have a marking that specifies its diameter. The markings must be clearly recognizable after the shrinking process.General requirements for the shrinking processThe temperature and time parameters with regard to the shrinking process must be matched to the connection and the heat shrink tubing so as to minimize the thermal load on the conductor insula‐tion.The supplier must specify and document appropriate guidelines for the shrinking process parame‐ters.The shrinking process must not alter the properties of the conductor insulation.The insulation materials on the individual conductors must not be mechanically damaged, hard‐ened, or fused during the shrinking process.Connection requirementsApplies to splices only.The distance between the end of the conductor insulation and the splice (see figure 1) must be be‐tween 3 mm (minimum) and 6 mm (maximum).Legend 1a = 3+3-0 mmFigure 1 – Distance between end of conductor insulation and spliceTestsGeneral information DUTsA device under test (DUT) refers to a sealed connection manufactured under production condi‐tions, if possible. The length of the conductors must be at least 250 mm.For each test, 15 DUTs of each of the three categories below must be made and tested for each shrinking diameter as per the guidelines in section 2.6:2.7 2.82.92.103 3.1 3.1.1Page 5TL 82324: 2013-06–The minimum number of conductors and the minimum total conductor cross-sectional area –An average number of conductors–The maximum number of conductors and the maximum total conductor cross-sectional areaPreparation of DUTsPrior to each individual test, the DUTs must be tested for leak tightness as per section 3.2.Conductor insulation of DUTsThe conductor insulation must be designed for the thermal conditions of the tests as per section 3.3 and section 3.4 (see also VW 60306).Leak tightness/insulation resistance Splices (crimped – ultrasonic-welded)The test setups are shown in figure 2 and figure 3.Legend 1Cu electrode2Teraohmmeter or high voltage 35% NaCl solution 4SpliceFigure 2 – Leak tightness test for splicesThe DUTs are immersed in a 5% NaCl solution at room temperature for 4 h.At least 100 mm of the line ends must extend freely outside the container.A teraohmmeter is then used to apply a test voltage of 100 V DC between the line ends and the Cu electrode (>1 cm 2) and the resistance is read after 30 s.3.1.23.1.33.2 3.2.1Page 6TL 82324: 2013-06Requirement:The resistance must be >100 MΩ.Cable lugsThe test setup is shown in figure 3.Legend 1Compressed air 2Heat-shrink tubing3Low-surface tension 5% NaCl solutionFigure 3 – Leak tightness test for cable lugs and splicesOver-pressure testUsing compressed air, an over-pressure is applied to the connection point immersed in solution (in figure 3).Test pressure 0,7 bar (minimum: 0,5 bar)Test duration 15 sRequirement:No air bubbles must escape from the connection point.Vacuum testApplies to release tests only.A vacuum is applied to the connection point immersed in solution (seefigure 3).Test pressure -0,4 bar Test duration10 min3.2.23.2.2.13.2.2.2Page 7TL 82324: 2013-06Requirement:The test pressure (vacuum) must not increase to more than -0,38 bar during the test period.Thermal agingThe prepared DUTs are aged for 3 000 h at +120+5-0 °C in a forced air oven in vertically hanging position. After the DUTs have cooled to room temperature, the leak tightness test as per section 3.2 is conducted.Requirement:No cracks must occur.The adhesive must not drip.Thermal overload testThe prepared DUTs are aged for 168 h at +130+5-0 °C in a forced air oven in vertically hanging posi‐tion. After the DUTs have cooled to room temperature, the leak tightness test as per section 3.2 is conducted.Requirement:No cracks must occur.The adhesive must not drip.Thermal shock testThe following cycle is conducted 5 times with the DUTs:–Aging for 1 h at +130+5-0 °C–After this, immediate immersion in water at a temperature of +5 °C for 15 minAfter the 5th cycle, the leak tightness test as per section 3.2 is conducted.Environmental cycle testThe following cycle is conducted 5 times with the prepared DUTs:–18 h at +40 °C and 95% relative humidity – 4 h at -40 °C–2 h at room temperatureAfter the 5th cycle, the leak tightness test as per section 3.2 is conducted.Hot pressure testHeat shrink tubing pieces are shrunk onto a metal pin at +150 °C for 5 min. The pin must have a diameter of 75% of the tubing's nominal diameter.The tubing is then loaded as shown in the apparatus illustrated in figure 4 with a weight of 150 g at +90 °C for 1 h. On conclusion of the test period, the tube is cooled down immediately by immersing in +15 °C water.3.33.43.53.63.7Page 8TL 82324: 2013-06Legend1Test frame2DUT3Base plate4Weight50,7+0,01mm-0,00Figure 4 – Test device for hot pressure testRequirement:Residual wall thickness>40%3.8Low-temperature impact strengthThe test device is shown in figure 5.The prepared DUTs are conditioned together with the test device in a conditioning cabinet for 4 h at -40 °C. In the cabinet, a 200 g weight is dropped onto the DUT from a height of 100 mm. After‐wards, the leak tightness test as per section 3.2 is conducted.Page 9TL 82324: 2013-06Legend1Steel block >10 kg2Impact piece 100 g3Drop weight4DUTFigure 5 – Test device for low-temperature impact strengthRequirement:No cracks and/or fractures must occur.Abrasion resistanceHeat shrink tubing pieces are shrunk onto a metal pin at +150 °C for 5 min. The pin must have a diameter of 75% of the tubing's nominal diameter.Using the test device shown in figure 6, the DUT is abraded at room temperature by scraping. Load500 gNumber of double strokes per minute50 to 60Stroke10 mm3.9Page 10TL 82324: 2013-06Legend 1Stroking device 2Stroke3Weight piece 4Jaws 5Line 6Detail Y 7Test pin8X10CrNi18-8 (material number: 1.4310, as per DIN EN 10270-3) ∅ = 0,45 mmFigure 6 – Test setup for abrasion resistanceRequirement:Minimum of 3 000 double strokes up until the DUT is scraped through.Resistance to operating materials Fuel resistanceAt room temperature, the prepared DUTs are immersed for 30 min in DIN 51604 – B FAM test fluid as per DIN 51604-2 or in DIN ISO 1817 diesel fuel. After a drying period of 30 minutes, the DUTs are tested for leak tightness as per section 3.2.Engine oil resistanceThe specimens are aged for 30 min in ASTM oil No. III at +100 °C.The operating fluid is wiped off and the DUTs cooled down to room temperature. The DUTs are then tested for leak tightness as per section 3.2.Transmission fluid resistanceThe specimens are aged 30 min in automatic transmission fluid (ATF) at a temperature of +100 °C.3.10 3.10.13.10.23.10.3Page 11TL 82324: 2013-06The operating fluid is wiped off and the DUTs cooled down to room temperature. The DUTs are then tested for leak tightness as per section 3.2.Requirement:The heat shrink tubing/adhesive must not have any visible corrosion or damage.The tube must not swell or shrink.The marking as per section 2.8 must still be recognizable.Shear strength The prepared DUTs are loaded as shown in figure 7 with a weight of 5 000 g for 15 s. Suddenloading, i.e., by jerks, must be avoided. Afterwards, the leak tightness test as per section 3.2 is conducted.Legend1Clamping device 2WeightFigure 7 – Test device for shear strengthApplicable documentsThe following documents cited in this standard are necessary to its application.Some of the cited documents are translations from the German original. The translations of Ger‐man terms in such documents may differ from those used in this standard, resulting in terminologi‐cal inconsistency.Standards whose titles are given in German may be available only in German. Editions in other languages may be available from the institution issuing the standard.VW 01155Vehicle Parts; Approval of First Supply and Changes VW 60306–3.11 4Page 12TL 82324: 2013-06VW 91101Environmental Standard for Vehicles; Vehicle Parts, Materials, Operat‐ing Fluids; Avoidance of Hazardous SubstancesDIN 51604-2Methanolic FAM testing fluid for polymer materials; composition and re‐quirementsDIN EN 10270-3Steel wire for mechanical springs - Part 3: Stainless spring steel wire DIN ISO 1817Rubber, vulcanized - Determination of the effect of liquids。
