1、BRITISH STANDARD AEROSPACE SERIES BS 3G 198-4:1996 Incorporating Amendment No. 1 Sleeves and moulded components for aircraft electric cables and equipment wires Part 4: Specification for fluoropolymer heat shrinkable sleeving for binding and insulation ICS 49.060BS3G 198-4:1996 This British Standard
2、, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 September 1996 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ACE/6 Draft for comment 94/712
3、804 DC ISBN 0 580 25176 4 Committees responsible for this British Standard The 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 Airways British Cable Ma
4、kers Confederation British Rubber Manufacturers Association Civil Aviation Authority (Airworthiness Division) Federation of the Electronics Industry Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date Comments 9769 February 1998 Indicated by a
5、 sideline in the marginBS3G 198-4:1996 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Information to be supplied by the purchaser 1 4 Materials and characteristics 2 5 Finish 2 6 Dimensions 2 7 Shelf life 3 8 Type testing 4 9 Production r
6、outine and quality testing 5 10 Tests and requirements for finished sleeving 6 11 Marking and packaging 18 Annex A (informative) Storage recommendations 19 Figure 1 Mandrel for restricted shrinkage test 16 Figure 2 Test configuration for flammability test 17 Table 1 Types of heat-shrinkable sleeving
7、 1 Table 2 Materials and characteristics 2 Table 3 Dimensions of type 20 sleeves 2 Table 4 Dimensions of type 20A sleeves 3 Table 5 Dimensions of type 21A sleeves 3 Table 6 Dimensions of type 21B sleeves 3 Table 7 Standard cutting tolerances for cut lengths of sleeving 3 Table 8 Type tests 4 Table 9
8、 Production routine tests 4 Table 10 Production quality tests 5 Table 11 Tests and requirements for finished sleeving 6 Table 12 List of test fluids 18 List of references 20BS3G 198-4:1996 ii BSI 07-1999 Foreword This Part of BSG198 has been prepared by Technical Committee ACE/6 and specifies requir
9、ements for heat shrinkable sleeves and sleeving for aircraft electric cables and insulated equipment wires. BSG198 is published in the following separate Parts. Part 1: Specification for elastomeric sleeves for binding and identification; Part 2: Specification for slip-on sleeves for identification
10、purposes; Part 3: Specification for heat-shrinkable sleeving for binding, insulation and identification; Part 4: Specification for fluoropolymer heat-shrinkable sleeving for binding and insulation; Part 5: Specification for heat-shrinkable moulded shapes 1) . It is envisaged that there will be a fur
11、ther Part on heat-shrinkable dual wall sleeves. This Part of BSG198 specifies requirements for fluoropolymer, high performance heat shrinkable sleeving, in a range of diameters, lengths and materials, suitable for binding and insulation of electric cables and insulated equipment wires in aircraft. T
12、hese sleeves are not normally printed. The various types of sleeving covered by this Part of BSG198 have been designated by the allocation of type numbers. These numbers have been adopted by the aircraft industry over a period of years and do not necessarily run consecutively through the Parts of BS
13、G198. Sleeving should be installed in accordance with the manufacturers or the suppliers instructions and, in particular, it should be noted that when shrinkage is restricted some properties may be impaired, e.g. wall thickness will be reduced, and sleeving life may also be reduced. It should be not
14、ed that the majority of heat guns available for the application of sleeving are not suitable for use in potentially explosive atmospheres. Application tools suitable for the installation of heat-shrinkable sleeving in these areas should be designed for Zone2 areas as specified in BS5345-2. WARNING N
15、OTE 1. This standard calls for 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 a
16、t any stage of manufacture or use. WARNING NOTE 2. It should be clearly understood that the flammability test is in no way suitable for assessing a fire hazard situation. It is solely for the purpose of specifying the basic material requirements of the heat-shrinkable sleeving. A British Standard do
17、es not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an ins
18、ide front cover, pages i and ii, pages1to 20, an inside back cover 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 theinside front cover. 1) In preparation.BS3G198-4:1996 BSI 07-1999 1 1
19、Scope This Part of BS G198 specifies the design, performance, quality assurance requirements and methods of test for the types of heat-shrinkable sleeving given in Table 1. These sleeves are suitable for binding and insulation purposes. Routine and quality tests are specified. In addition to the def
20、initive requirements, this Part of BS G198 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 1Guidance for the storage of finished sleeves is given in Annex A. NOTE 2T
21、he latest revision of an Aerospace Series standard is indicated by a prefix number. NOTE 3Sleeving that has been shrunk is referred to as recovered. 2 References 2.1 Normative references This Part of BSG198 incorporates, by dated or undated reference, provisions from other publications. These normat
22、ive references are made at the appropriate places in the text and the cited publications are listed on page 20. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard only when incorporated in the refere
23、nce by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the t
24、ime of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Information to be supplied by the purchaser The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throug
25、hout the standard and the following documented items shall 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 3G198-4:1996); b) the total quantity required; c) cut length, if required (see6.2) and tolerance on cut len
26、gth, if the tolerance required is different from Table 7; d) minimum continuous lengths on spools, if required (seenote 1 of 6.2); e) whether the sleeving is to be tested in any further fluids in addition to those given in Table 12 (see10.20); f) coded identification (see note1 of 11.1); g) packagin
27、g requirements (see11.2). If sizes and/or tolerances other than those specified in this Part of BS G198 are required, full details of the requirements should be specified by the purchaser in the contract or order. Table 1 Types of heat-shrinkable sleeving Type Guide to temperature range Exposure tem
28、perature Recommended minimum shrink temperature dand shrink ratio C Guide to stiffness Other main properties C C a a b b c c 20 55 to 175 175 225 275 175 2 : 1 Semi-rigid Abrasion resistant, clear and low combustibility 20A 55 to 150 150 225 275 175 2 : 1 Semi-flexible Abrasion resistant, clear and
29、low combustibility 21A 65 to 260 260 350 400 330 3 : 2 Semi-rigid Abrasion resistant and low combustibility 21B 65 to 260 260 350 400 330 4 : 1 Semi-rigid Abrasion resistant and low combustibility a Temperature a is for a minimum of 20000h when assessing in accordance with 10.21 for types 20 and 20A
30、 only. See10.21 for types21. b Temperature b is for a minimum of 168h when assessing in accordance with 10.9. c Temperature c is for a minimum of 4h when assessing in accordance with 10.11. d The minimum shrink temperature is the minimum temperature at which full recovery can be guaranteed. Refer to
31、 the manufacturer/supplier for actual values.BS3G198-4:1996 2 BSI 07-1999 Table 2 Materials and characteristics 4 Materials and characteristics Sleeving shall be made from materials that ensure that the finished sleeving conforms to the appropriate requirements of clause10. NOTE 1Materials known to
32、meet the requirements of the tests specified in clause10 will have the characteristics given in Table 2. NOTE 2The tests specified in clause10 are performed on finished sleeving. 5 Finish The sleeving, both before and after unrestricted shrinkage, shall be free from bubbles, pinholes and other defec
33、ts that may affect performance. 6 Dimensions 6.1 The internal diameters and related wall thickness of the sleeving, both before and after unrestricted shrinkage, as applicable, shall conform to the requirements given in Table 3 to Table 6, unless otherwise agreed with the purchaser (seeclause 3). 6.
34、2 Cut lengths of sleeving shall be cut to the tolerances specified in Table 7 unless otherwise agreed with the purchaser (seeclause 3). NOTE 1Sleeving supplied on a spool may not necessarily be in a continuous length. If a minimum cut length is required, the length should be stated by the purchaser
35、in the contract or order (seeclause 3). NOTE 2The minimum continuous lengths will vary with size and material. Table 3 Dimensions of type 20 sleeves Type Materials Characteristics 20 Polyvinylidene fluoride This sleeving is basically transparent but may be tinted. It issemi-rigid, tough and abrasion
36、 resistant, and is suitable for use where strain relief and mechanical protection are required, or where their transparent properties are desirable. It is not suitable for shrinkage onto surfaces having sharp changes in profile. 20A Semi-flexible polyvinylidene fluoride This sleeving is transparent,
37、 semi-flexible, tough and abrasion resistant and is suitable for use where strain relief and mechanical protection are required or where its transparent properties are desirable. It is not suitable for use where contamination from phosphate ester based hydraulic fluid is possible. 21A Polytetrafluor
38、oethylene (PTFE) (low shrink ratio) This sleeving is milk white translucent. It is suitable for use where resistance to chemicals and high temperature performance are required. It is flame resistant and has a low shrink ratio. 21B Polytetrafluoroethylene (PTFE) (high shrink ratio) This sleeving is m
39、ilk white translucent. It is suitable for use where resistance to chemicals and high temperature performance are required. It is flame resistant and has a high shrink ratio. All dimensions in millimetres Size code As supplied After unrestricted shrinkage Internal diameter (min.) Internal diameter (m
40、ax.) Wall thickness Tolerance on wall thickness 01 02 03 04 05 06 07 08 09 10 11 1.2 1.6 2.4 3.2 4.8 6.4 9.5 12.7 19.0 25.4 38.0 0.6 0.8 1.2 1.6 2.4 3.2 4.8 6.4 9.5 12.7 19.0 0.25 0.25 0.25 0.25 0.25 0.30 0.30 0.30 0.45 0.50 0.55 0.05 0.05 0.05 0.05 0.05 0.10 0.10 0.10 0.10 0.10 0.15BS3G198-4:1996 B
41、SI 07-1999 3 Table 4 Dimensions of type 20A sleeves Table 5 Dimensions of type 21A sleeves Table 6 Dimensions of type 21B sleeves Table 7 Standard cutting tolerances for cut lengths of sleeving 7 Shelf life NOTEThe use by date is the shelf life when stored under the conditions specified in Annex A.
42、The use by date shall be the guaranteed minimum storage time for which the sleeving retains the as supplied internal diameter. Also, following unrestricted shrinkage in accordance with 10.3, the sleeving shall conform to the internal diameter, wall thickness and longitudinal change requirements spec
43、ified in this Part of BS G198. All dimensions in millimetres Size code As supplied After unrestricted shrinkage Internal diameter (min.) Internal diameter (max.) Wall thickness Tolerance on wall thickness 01 02 03 04 05 06 07 08 09 10 1.2 1.6 2.4 3.2 4.8 6.4 9.5 12.7 19.0 25.4 0.6 0.8 1.2 1.6 2.4 3.
44、2 4.8 6.4 9.5 12.7 0.25 0.25 0.25 0.25 0.25 0.30 0.30 0.30 0.45 0.50 0.05 0.05 0.05 0.05 0.05 0.10 0.10 0.10 0.10 0.10 All dimensions in millimetres Size code As supplied After unrestricted shrinkage Internal diameter (min.) Internal diameter (max.) Wall thickness Tolerance on wall thickness 01 02 0
45、3 04 05 06 07 08 09 10 11 12 13 14 15 0.85 1.00 1.25 1.40 1.50 1.90 2.35 3.00 3.80 4.85 6.10 7.65 9.40 10.90 11.90 0.4 0.5 0.7 0.8 1.0 1.3 1.6 2.0 2.3 2.9 3.6 4.6 5.7 7.1 8.9 0.23 0.25 0.25 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.38 0.38 0.38 0.38 0.38 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
46、0.12 0.12 0.12 0.12 0.12 All dimensions in millimetres Size code As supplied After unrestricted shrinkage Internal diameter (min.) Internal diameter (max.) Wall thickness Tolerance on wall thickness 01 02 03 04 05 06 07 08 09 1.95 3.15 6.35 9.50 12.70 15.85 19.00 25.40 31.75 0.65 0.95 1.60 2.45 3.70
47、 4.55 5.70 7.10 8.85 0.23 0.25 0.30 0.30 0.38 0.38 0.38 0.38 0.38 0.08 0.08 0.10 0.10 0.12 0.12 0.12 0.12 0.12 All dimensions in millimetres Cut length Standard cutting tolerance 0 to 9.9 10 to 24.9 25 to 49.9 50 to 100.9 101 to 150.9 151 to 250.9 251 to 1200.9 1201 and over 0.5 1.0 1.5 3.0 4.0 5.0
48、12.0 1 %BS3G198-4:1996 4 BSI 07-1999 8 Type testing 8.1 Type tests 8.1.1 The manufacturer or supplier shall provide details of the following: material composition; agreed techniques; and evidence, to the satisfaction of the type approving authority 2) , that sleeving supplied in accordance with this
49、 Part of BS G198 conforms to the requirements of clause10, which describes the tests listed in Table 8. All test results shall be recorded and retained for the duration of the approval. 8.1.2 Type tests shall be performed on sizes taken from the top, middle and bottom of the manufacturers or suppliers range for each different material, unless otherwise indicated in Table 8. The smallest sleeving to
