1、BRITISH STANDARD AEROSPACE SERIESBS G 198-5:1997Incorporating Amendment No. 1Sleeves and moulded components for aircraft electric cables and equipment wires Part 5: Specification for heat shrinkable moulded shapesICS 49.060BS G 198-5:1997This British Standard, having been prepared under the directio
2、n of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1997 BSI 16 November 2005The following BSI references relate to the work on this standard:Committee reference ACE/6Draft for comment 94/705034 DCISBN 0 580 26858 6Committees
3、 responsible for this British StandardThe preparation of this British Standard was entrusted to Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, upon which the following bodies were represented:British AirwaysBritish Cable Makers ConfederationBritish Rubber Manufa
4、cturers AssociationCivil Aviation Authority (Airworthiness Division)Federation of the Electronics IndustryMinistry of DefenceSociety of British Aerospace CompaniesAmendments issued since publicationAmd. No. Date Comments15961 16 November 2005 Changes to Clause 7, Table 7, Table 8 and Figure 2BS G 19
5、8-5:1997 BSI 16 November 2005 iContentsPageCommittees responsible Inside front coverForeword iii1Scope 12 References 13 Information to be supplied by the purchaser 14 Materials and characteristics 25 Colour 26Finish 27 Dimensions 28 Shelf life 29Type testing 310 Production routine and quality testin
6、g 411 Tests and requirements 612 Marking and packaging 17Annex A (informative) Storage recommendations 41Annex B (normative) Method for the determination of smoke index 41Annex C (normative) Method for the determination of combustion products index 46Annex D (normative) Compatibility test 49Annex E
7、(informative) Compatibility guide 52Annex F (informative) Guide to installation 53Figure 1 Style A (lipped straight bottle with short body) 19Figure 2 Style B (lipped straight bottle with medium body) 20Figure 3 Style C (lipped straight bottle with long body) 21Figure 4 Style D (non-lipped straight
8、bottle) 22Figure 5 Style E (lipped straight bottle with long tail) 23Figure 6 Style F (lipped right angle boot) 24Figure 7 Style G (non-lipped right angle boot) 25Figure 8 Style H (lipped right angle boot with long tail) 26Figure 9 Style I (lipped right angle boot with longer tail) 28Figure 10 Style
9、 J (lipped straight bottle with longer tail) 29Figure 11 Style K (non-lipped straight long tail boot) 30Figure 12 Style L transitions (“T” junction) 31Figure 13 Style M transitions (30/45 junction) 32Figure 14 Style N transitions (“Y” junction 45 low profile) 33Figure 15 Style O (straight, high rati
10、o lipped boot) 34Figure 16 Style P transitions (“Y” junction) 35Figure 17 Style R transitions (three branched outlets) 36Figure 18 Style S transitions (four branched outlets) 37Figure 19 Style T D sub-miniature boot straight) 38Figure 20 Style U D sub-miniature boot right angle) (longitudinal) 39Fig
11、ure 21 Style V D sub-miniature boot right angle (across width) 40Figure B.1 Schematic details of burner for smoke index test 43Figure B.2 Schematic front view of smoke index test piece holder 44Figure D.1 Schematic arrangement for peel testing 51Figure F.1 Sequence of operations for installation of
12、a heat-shrinkable straight boot 55BS G 198-5:1997ii BSI 16 November 2005PageFigure F.2 Sequence of operations for installation of a heat-shrinkable right angled boot 56Table 1 Types of heat-shrinkable moulded shape materials 2Table 2 Materials and characteristics 3Table 3 Type tests 4Table 4 Product
13、ion routine tests 5Table 5 Production quality tests 5Table 6 List of test fluids 17Table 7 Dimensions of style A 19Table 8 Dimensions of style B 20Table 9 Dimensions of style C 21Table 10 Dimensions of style D 22Table 11 Dimensions of style E 23Table 12 Dimensions of style F 24Table 13 Dimensions of
14、 style G 25Table 14 Dimensions of style H 27Table 15 Dimensions of style I 28Table 16 Dimensions of style J 29Table 17 Dimensions of style K 30Table 18 Dimensions of style L 31Table 19 Dimensions of style M 32Table 20 Dimensions of style N 33Table 21 Dimensions of style O 34Table 22 Dimensions of st
15、yle P 35Table 23 Dimensions of style R 36Table 24 Dimensions of style S 37Table 25 Dimensions of style T 38Table 26 Dimensions of style U 39Table 27 Dimensions of style V 40Table E.1 Bonding adhesives 52Table E.2 Guide to adhesive compatibility 52List of references 58BS G 198-5:1997 BSI 16 November
16、2005 iiiForewordThis Part of BS G 198 has been prepared by Technical Committee ACE/6 and specifies requirements for heat-shrinkable moulded shape materials for aircraft electric cables and insulated equipment wires. BS G 198 is published in the following Parts. Part 1: Specification for elastomeric
17、sleeves for binding and identification; Part 2: Specification for slip-on sleeves for identification purposes; Part 3: Specification for heat-shrinkable sleeving for binding, insulation and identification; Part 4: Specification for heat-shrinkable sleeving for binding and insulation; Part 5: Specifi
18、cation for heat-shrinkable moulded shapes.It is envisaged that there will be a further Part on heat-shrinkable dual wall sleeves.This Part of BS G 198 specifies requirements for heat-shrinkable moulded shapes in a range of configurations and materials suitable for insulation, environmental sealing,
19、mechanical protection and strain relief for connector/cable terminations and multi-way transitions. These shapes are normally available in black, but other colours may be available.Moulded shapes should be installed in accordance with manufacturers or suppliers instructions and, in particular, it sh
20、ould be noted that when shrinkage is restricted some properties may be impaired, e.g. wall thickness will be reduced; and moulded shape performance may also be reduced. A guide to installation is detailed in Annex F.Heat-shrinkable moulded shapes are normally used with a bonding adhesive as detailed
21、 in Annex E Table E.1. Some of these adhesives may be supplied pre-coated or as a separate component. Annex E also details the recommended combinations of adhesive types, moulded shapes and sleevings. The requirements for adhesive compatibility are detailed in Annex D.It should be noted that the maj
22、ority of heat guns available for the application of moulded shapes are not suitable for use in potentially explosive atmospheres. Application tools suitable for the installation of heat-shrinkable moulded shapes in those areas should be designed for zone 2 areas as specified in BS 5345-2:1983.WARNIN
23、G NOTE 1. This standard requires the use of substances and/or test procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves either the supplier or the user from statutory obligations relating to health and safety
24、 at any stage of manufacture or use.WARNING NOTE 2. It should be clearly understood that the combustion characteristics tests detailed in this standard, i.e. flammability, oxygen index, flammability temperature, smoke index and combustion products index are in no way suitable for assessing a total f
25、ire hazard situation. They are solely for the purpose of specifying the basic material quality requirements of the heat-shrinkable shapes.WARNING NOTE 3. The use of heat-shrinkable materials entails the risk from heat, solvents and gases. Every precaution is to be exercised against the harmful effec
26、ts by the use of protective gloves and good ventilation etc.BS G 198-5:1997iv BSI 16 November 2005This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer im
27、munity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 59 and a back cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the
28、 inside front cover.BS G 198-5:1997 BSI 16 November 2005 11 ScopeThis Part of BS G 198 specifies the design, material performance requirements, quality assurance requirements and test procedures for the types of heat-shrinkable moulded shapes shown in Table 1.In addition to the definitive requiremen
29、ts, this standard also requires the items detailed in clause 3 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied.NOTE 1 Guidance for the storage of finished moulded shapes is given in Annex A.NOTE 2 The latest revision
30、 of an aerospace series standard is indicated by a prefix number.NOTE 3 Moulded shapes that have been shrunk are referred to as recovered.When specified, moulded shapes used with bonding adhesives shall conform to the compatibility test requirements detailed in Annex D.2 References2.1 Normative refe
31、rencesThis British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on page 58. Subsequent amendments to, or revisions of, any of these publications
32、 apply to this British Standard only when incorporated in it by updating or revision.2.2 Informative referencesThis British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the insid
33、e back cover, but reference should be made to the latest editions.3 Information to be supplied by the purchaserThe following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items sh
34、all be satisfied before a claim of compliance with the standard can be made and verified:a) the number of this British Standard (i.e. BS G 198-5:1996);b) the total quantity required;c) the colour, if other than black;d) the potting ports, if required (see clause 12);e) the codified identification (s
35、ee clause 12);f) the packaging requirements;g) compatibility, if required (see Annex D);h) whether the material is to be tested in any further fluids in addition to those given in Table 6 (see 11.13).The description and dimensions of non-standard shapes shall be agreed between the purchaser and the
36、manufacturer or supplier. BS G 198-5:19972 BSI 16 November 2005Table 1 Types of heat-shrinkable moulded shape materials4 Materials and characteristicsShapes shall be made from materials which meet the appropriate requirements of clause 11.NOTE Materials known to meet the requirements of the tests sp
37、ecified in clause 11 will have the characteristics shown in Table 2.5 ColourThe colour shall be uniform and evenly dispersed, and recognizable as one of those given in BS 6746C:1993.6 FinishThe moulded shapes, both before and after unrestricted shrinkage, shall be free from bubbles, pinholes, and ot
38、her defects that may affect performance.7 DimensionsThe dimensions for standard moulded shapes, both before and after unrestricted shrinkage shall be as specified in the appropriate table of Table 7 to Table 27.NOTE 1 Unless otherwise indicated, the dimensions in Table 7 to Table 27 are in millimetr
39、es.NOTE 2 Non-standard moulded shapes are available in dimensions other than those specified in Table 7 to Table 27.8 Shelf lifeThe “use-by” date shall indicate the end of the guaranteed storage time for which clause 7 still applies when stored under the conditions as specified in Annex A.NOTE The “
40、use-by” date is the shelf life.TypecodeGuide to temperature range CExposure temperature CRecommended min. shrink temperature C (4)Guide to stiffnessOther main properties(1) (2) (3)DA 55 to + 135135 175 225 135 Semi rigid Flame retardantDB 55 to + 135135 175 225 125 Flexible Flame retardant, low shri
41、nk temperatureDC 75 to + 130130 175 250 135 Very flexible Flame resistantDD 55 to + 200200 250 300 175 Flexible Flame retardant, oil and fuel resistantDE 75 to + 120120 160 215 150 Semi rigid Flame retardant, oil resistantDF 30 to + 105105 150 175 135 Semi rigid Limited fire hazardTemperature (1) is
42、 for a minimum of 20 000 h when assessed in accordance with 11.16.Temperature (2) is for a minimum of 168 h when assessed in accordance with 11.10.Temperature (3) is for a minimum of 4 h when assessed in accordance with 11.14.The minimum shrink temperature (4) is the minimum temperature at which ful
43、l recovery can be guaranteed. Refer to the manufacturer/supplier for actual value.BS G 198-5:1997 BSI 16 November 2005 3Table 2 Materials and characteristics9 Type testing9.1 Type tests9.1.1 The manufacturer or supplier shall provide details of the following:a) material composition;b) agreed techniq
44、ues; andc) evidence to the satisfaction of the approving authority1)that the material used to manufacture the moulded shapes conforms to the appropriate type tests listed in Table 3, details of which are given in clause 11.All test results shall be recorded and retained for the duration of the appro
45、val.The dimensions of the moulded shapes shall be as specified in Table 7 to Table 27.9.1.2 Unless otherwise specified type tests shall be performed using test sheets as specified in clause 10.4.In the event of a failure of the moulding material to conform to the requirements of any test, the batch
46、of material shall be re-sampled and the test repeated using two further sets of test pieces. Both sets shall conform to the appropriate test requirements, otherwise the batch of material shall be deemed not to conform to the requirements of this standard.9.1.3 No changes shall be made to the declare
47、d material composition and agreed techniques used in the production of the moulded shapes, without the prior written agreement of the type approving authority.Type code Material CharacteristicsDA Semi-rigid modified polyolefinThese moulded shapes are semi-rigid and flame retardant. They are suitable
48、 for mechanical protection, strain relief and for use in areas subject to occasional contamination by aircraft fuels and hydraulic fluids. The standard colour is black.DB Flexible modified polyolefinThese moulded shapes are flexible, flame retardant, and have a lower shrink temperature than type DA.
49、 They are suitable where flexible terminations are required and where sensitive components and delicate wiring needs protection from excessive heat during recovery. The standard colour is black.DC Silicone These moulded shapes are very flexible, flame retardant and exhibit ablative characteristics. They are suitable for use in areas subject to short periods of extreme heat. The standard colour is black.DD Fluorocarbon These mould
