1、BRITISH STANDARD AEROSPACE SERIES BS3F 121: 1995 Specification for Metallic slide fasteners for aerospace purposes UDC 629.7:672.83-034:62-219.2-034BS3F121:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Stan
2、dards Board and comesintoeffect on 15December1995 BSI 08-1999 First published1964 Second edition1989 Third edition December1995 The following BSI references relate to the work on this standard: Committee reference ACE/21 Draft for comment 92/75217 DC ISBN 0 580 24621 3 Committees responsible for thi
3、s British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/21, Narrow woven fabrics for aircraft, upon which the following bodies were represented: British Narrow Fabrics Association Ministry of Defence Society of British Aerospace Companies Limited Society
4、of Dyers and Colourists Amendments issued since publication Amd. No. Date CommentsBS3F121:1995 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 General requirements for the tapes 1 5 Designation 2 6 Materials 2 7 Finished fa
5、steners 3 Annex A (informative) Information to be supplied by the purchaser 7 Annex B (normative) Method for determination of breaking strength of slider 7 Annex C (normative) Method for determination of security of attachment of end fittings 7 Annex D (normative) Method for determination of lateral
6、 breaking strength of meshed chain 8 Annex E (normative) Method for determination of lateral breaking strength of open-end fittings 8 Annex F (normative) Method for determination of resistance of stringer bottom end fittings to treatment in sodium hydroxide solution 9 Annex G (normative) Method for
7、determination of resistance of adhesive to dry cleaning 9 Figure 1 Shuttleless construction with the weft secured by two knitted locking threads 2 Figure E.1 Apparatus for determination of lateral breaking strength of open-end fittings 8 Table 1 General requirements 1 Table 2 Designation 2 Table 3 M
8、aterials for metallic fittings 3 Table 4 Performance 6 List of references Inside back coverBS3F121:1995 ii BSI 08-1999 Foreword This British Standard has been prepared by Technical Committee ACE/21 and is one of a series for textiles of a quality suitable for aerospace purposes. It constitutes a rev
9、ision of BS2F121:1989 which is withdrawn, and differs from the previous edition in that meta-aramid fibre has been introduced as an alternative for tape manufacture, and the materials for metallic fittings have been revised. The requirements for shuttleless weaving have also been clarified NOTEThe l
10、atest revision of an Aerospace Series standard is indicated by a prefix number. This standard specifies pentachlorophenyl laurate (PCPL) as the only approved rot-proofing treatment for aerospace fabrics. Alternative treatments are under development, and this standard will be updated to delete PCPL a
11、s soon as an approved alternative treatment for aerospace fabrics is available. WARNING. 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 t
12、he supplier or the user from statutory obligations relating to health and safety at any stage of manufacture or use. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a
13、British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments
14、 incorporated. This will be indicated in the amendment table on the inside front cover.BS3F121:1995 BSI 08-1999 1 1 Scope This British Standard specifies requirements for two designations of metallic slide fasteners for aerospace purposes. NOTEThe information to be supplied by the purchaser in the c
15、ontract or order is listed in Annex A. 2 References 2.1 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside ba
16、ck cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, tog
17、ether with any amendments. 2.2 Informative references This 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 inside back cover, butreference should be made to the latest editions.
18、 3 Definitions For the purposes of this British Standard, the definitions given in BS3084:1992 apply, together with the following. 3.1 quick release fastener a slide fastener so designed that it may be opened with the slider still at the top stop end of the chain by the application of sufficient for
19、ce to override a detent 3.2 interchangeable open-end fastener an open-end slide fastener either stringer of which can be interchanged with the corresponding stringer of any other fastener from the same batch or delivery 3.3 self-locking fastener a slide fastener fitted with a slider so designed that
20、 it becomes locked in any desired position on the chain when the puller is released and such that the slider will remain locked in that position regardless of uncontrolled movement of the puller and until released by further manipulation of the puller 3.4 non-locking fastener a slide fastener fitted
21、 with a puller which is not provided with a locking device 3.5 batch the output of an individual machine applying the teeth to the tape 4 General requirements for the tapes 4.1 In addition to the requirements specified in clauses5 to7, the following sections and clauses of the latest edition of BS F
22、100 shall apply (see Table 1). 4.2 The required methods of test, performance standards, inspection and acceptance limits shall conform to BS F100 unless otherwise stated in this standard. In the event of any dispute, the methods of test, performance standards, inspection and acceptance limits stated
23、 in this standard shall prevail. 4.3 The type tests (see7.8.5) shall be carried out at the commencement of each contract, or when any change to the material or adhesive occurs. Table 1 General requirements (given in BS F100) Section Title Requirements and tests 1 General All requirements 2 Quality r
24、equirements Requirements for manufacture of narrow fabrics Requirements for dyed textiles except those relating to fabric intended for coating Requirements for freedom from corrosive impurities (see section4) Requirements for freedom from faults of woven narrow fabrics 4 Chemical tests If required b
25、y section 2: test for conductivity of aqueous extract test for pH value of aqueous extract test for water soluble chloride test for water soluble sulfateBS3F121:1995 2 BSI 08-1999 5 Designation The designations of slide fasteners specified by this British Standard shall be as shown in Table 2. Table
26、 2 Designation 6 Materials 6.1 Tapes 6.1.1 The tapes for the fasteners shall be woven either: a) conventionally, i.e.in a shuttle loom; or b) shuttleless, i.e.in a shuttleless loom (see6.1.2). 6.1.2 Tapes woven on a shuttleless loom shall conform to the following: a) the weft shall be secured by two
27、 knitted locking threads (see Figure 1 for guidance); and b) it shall not be possible for either of the locking threads to be pulled out of the body of the tape; and c) in the event of a breakdown of one of the locking threads, continued unravelling of the selvedge shall not occur. Designation a Cod
28、e Nominal width across meshed chain mm Medium MR 5.0 to 6.5 Large LS 6.5 to 10.0 NOTE 1The fasteners differ in performance (see Table 4). NOTE 2The fastener designation should be stated by the purchaser in the contract or order (see Annex A). a These designations were previously known as “medium reg
29、ular” and “large special”. Figure 1 Shuttleless construction with the weft secured by two knitted locking threadsBS3F121:1995 BSI 08-1999 3 6.1.3 The tape shall be manufactured from one of the following: a) polyamide; or b) polyester; or c) cotton (see6.2); or d) a combination of6.1.3 a) to6.1.3 c);
30、 or e) meta-aramid fibre. NOTEThe type of tape required should be stated by the purchaser in the contract or order (see Annex A). 6.1.4 A bead of textile material shall be present on the tape edge to facilitate the attachment of the teeth. 6.1.5 The bead shall be either: a) woven integrally with the
31、 tape; or b) formed by a cord on each face of the tape securely attached by lock stitching. 6.1.6 The width of the finished tape shall be: a) for medium fasteners 15 mm b) for large fasteners 25mm 6.2 Rot-proofing If cotton material is used see6.1.3 c), the tape complete with bead or, alternatively,
32、 the constituent tape, bead cords and sewing thread shall be rot-proofed with pentachlorophenyl laurate (PCPL) from aqueous emulsion in accordance with the normal process given in Part1 of BS2087:1992 except that the PCPL content of the cotton portion shall be from1.7% to3.5%. The PCPL content shall
33、 be determined on the cotton portion only. 6.3 Dyeing 6.3.1 Where dyeing is required, the colour of the tapes shall be specified by reference to a British Standard, e.g.BS381C, or otherwise by pattern. NOTEThe requirement for dyeing and the colour should be stated by the purchaser in the contract or
34、 order (see Annex A). 6.3.2 Sulfur dyes and copper treatments shall not be used. 6.4 Metallic fittings The metallic fittings of the fasteners shall be manufactured from materials indicated by the letter A in Table 3. 7 Finished fasteners 7.1 General Finished fasteners shall conform to the requiremen
35、ts specified in7.2 to7.13. 7.2 Chain 7.2.1 The elements comprising the chain shall be free from sharp edges or burrs liable to damage clothing or injure the wearer. 7.2.2 When a fastener (other than an interchangeable open-end fastener), after being fully opened and closed, is laid on a horizontal s
36、mooth surface without any constraint, other than the application of such minimum stroking by the palm of the hand as is necessary to make it lie flat, the maximum deviation from a straight line joining the two ends of the meshed chain shall not exceed2% of the nominal length of the fastener. Table 3
37、 Materials for metallic fittings +1.5 1.0 +1.5 1.0 Fittings Brass Gilding metal Nickel silver 12%, 15%, 18% or20% Zinc base die cast alloy Common brass CZ108 a 2/1 brass CZ107 a 80/20 brass CZ103 a 85/15 brass CZ102 a NS104, NS105, NS106 or NS 108 a B b Teeth A A A Top and bottom stop A A A A Open-e
38、nd pins wrought A A A A Open-end boxes die cast A Slider bodies wrought A A A A Slider bodies die cast A Pullers flat A A A A A Pullers wrought A A A A Other slider components wrought A A A A Open end pins die cast A a Material designation from BS2870:1980. b Material designation from BS1004:1972.BS
39、3F121:1995 4 BSI 08-1999 7.2.3 When a fastener (other than an interchangeable open-end fastener) is laid on a horizontal smooth surface under a longitudinal tension of not more than5N, the meshed chain shall lie flat and waviness shall not be apparent in either chain or tapes. 7.2.4 The meshing elem
40、ents shall be so shaped as to prevent rotation on the long axis of the chain to an extent which impairs the correct action of the slider in meshing and unmeshing the chain. 7.2.5 The elements of the chain shall be so formed as not to disengage when the chain is folded in either direction round a met
41、al rod of4mm diameter for medium and6.5mm diameter for large fasteners, with the axis of the rod parallel to the width of the chain. The chain shall recover naturally from this position so that the normal operation of the slider is unimpaired. 7.3 Sliders 7.3.1 The puller shall be free to move throu
42、gh180 in a plane perpendicular to the face of the slider and in a line with the long axis of the chain. The puller shall have a hole near the tip. NOTEThe hole size should be stated by the purchaser in the contract or order (see Annex A). 7.3.2 When a self-locking slider is used on an open-end faste
43、ner the locking prong shall not hamper entry of the male pin when the fastener is being assembled. 7.4 Bottom stops The bottom stops of a closed-end fastener shall be attached securely and shall enclose the beads of both tapes. It shall be so fitted in relation to the last engaging members as to pre
44、vent disengagement of the chain. 7.5 Top stops Each top stop shall be securely attached to enclose the beaded edge of the tape. The top stops (excluding the single stop on quick-release fasteners) shall be of a size to permit complete entry into the slider when the fastener is fully closed. They sha
45、ll be so fitted that the slider does not jam on the top stops or top teeth when opening the completely closed fastener, with the tape extensions held parallel beyond the slider. 7.6 Open-end fittings 7.6.1 The female or box portion of the open-end fittings shall be attached securely to the right han
46、d tape when the fastener is laid on a horizontal surface with the open-end fittings towards the observer and the puller uppermost. 7.6.2 The pin forming the male portion of the open-end fittings shall not contain a flexing joint. It shall be securely attached to enclose the beaded edge of the opposi
47、te hand tape when the fastener is viewed as described in7.6.1. 7.6.3 All open-end fittings shall be so designed that, when assembling the fastener, it shall not be possible to move the slider away from the open-end fittings unless the pin is in the box to the full extent. If the pin is not held down
48、 to the full extent in the box, it will tend to leave the box on moving the slider and in such circumstances, when operating the slider by holding the puller between thumb and forefinger, it shall not be possible to mesh the fastener. 7.7 Quick-release fittings The force required to override the det
49、ent to operate the quick-release shall be25N to40N when tested in accordance with Appendix J of BS3084:1992. 7.8 Tape extensions and terminations 7.8.1 At both ends of the closed-end fasteners and at the top end of the open-end fasteners, each tape shall have a minimum length of25mm full width beyond the metal fittings (excluding the puller) of the closed fastener. 7.8.2 Where shuttleless weaving is employed the tape extensions shall have a minimum length of30mm. The tape shall be either: a) heat s
