1、BRITISH STANDARD BS 7969:2004 Adhesives Ethyl and methyl cyanoacrylate types 1, 2 and 3 ICS 83.180 BS 7969:2004 This British Standard, having been prepared under the direction of the Standards Policy and Strategy Committee, was published on 29 January 2004 BSI 29 January 2004 The following BSI refer
2、ences relate to the work on this British Standard: Committee reference PRI/52 Draft for comment 03/304576 DC ISBN 0 580 43033 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee, PRI/52, Adhesives, upon which the following
3、bodies were represented: British Adhesives and Sealants Association British Woodworking Federation Consumer Policy Committee of BSI Contract Flooring Association Department of the Environment Transport and the Regions represented by the Building Research Establishment European Resin Manufacturers As
4、sociation National Physical Laboratory SATRA The Tile Association Timber Research and Development Association TWI UK Steel Association University of Bristol Amendments issued since publication Text Amd No. CommentsBS 7969:2004 BSI 29 January 2004 i Contents Committees responsible Inside front cover
5、Foreword ii 1S c o p e 1 2 Normative references 1 3C o m p o s i t i o n 1 4 Information to be supplied by the purchaser 1 5 Test requirements 1 6 Shelf life 2 7 Containers and marking of containers 2 Annex A (normative) Method of test for the determination of bond strength 3 Annex B (normative) Met
6、hod of test for the determination of rapid setting properties 3 Table 1 Test requirements 1BS 7969:2004 ii BSI 29 January 2004 Foreword This British Standard has been prepared by Technical Committee PRI/52. The Standard is based on Defence Standard 80-146/Issue 2:22 February 1999, which is now withd
7、rawn. Although the scope of this British Standard remains the same as the Defence Standard, the method of determining bond strength has changed. In the Defence Standard the method described in BS 5350-C3 (involving the tensile strength of butt joints) was specified, whilst in this new standard, the
8、method has been changed to that specified by BS 5350-C5:2002 (tensile strength in lap shear). This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve th
9、e user from legal obligations relating to health and safety at any stage. This publication does not purport to include all necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligatio
10、ns. Summary of pages This document comprises a front cover, an inside front cover, page i and ii, pages 1 to 3 and a back cover.BS 7969:2004 BSI 29 January 2004 1 1 Scope This British Standard specifies requirements for two grades of one-component, rapid setting adhesives, each grade having three ty
11、pes. The grades of adhesives are the following. Grade E based on ethyl cyanoacrylate. Grade M based on methyl cyanoacrylate. The types of ethyl and methyl cyanoacrylate adhesives are the following. Type 1 low viscosity adhesive. Type 2 medium viscosity adhesive. Type 3 high viscosity adhesive. NOTE
12、The majority of cyanoacrylate adhesives used in industry are based on ethyl and methyl cyanoacrylate ester. The ethyl derivative is the most widely used and is recommended for general-purpose applications, particularly where rubber and plastics are involved. The methyl homologue gives stronger bonds
13、 to metal and generally shows more resistance to solvent attack. The two types are not necessarily interchangeable. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refe
14、rences, the latest edition of the referenced document (including any amendments) applies. BS 5350-B8, Methods of test for adhesives Adhesives Part B8: Determination of viscosity. BS 5350-C5:2002, Methods of test for adhesives Part C5: Determination of bond strength in longitudinal shear for rigid ad
15、herends. 3 Composition The adhesive shall consist of ethyl-2-cyanoacrylate monomer or methyl-2-cyanoacrylate monomer, modified as necessary by the addition of thickening agents, plasticizers and stabilizers. 4 Information to be supplied by the purchaser The purchaser shall state clearly in the contr
16、act or order the grade and type of adhesive to be supplied. 5 Test requirements All samples taken from any portion of the adhesive supplied shall be in accordance with Clause 3, free from visible impurities and foreign matter and, when tested by the methods specified, shall comply with the requireme
17、nts of Table 1. Table 1 Test requirements Item No Property Requirement Method of test Type 1 Type 2 Type 3 1V i s c o s i t y a t (25 1) C in mPa s Minimum 20 1 000 BS 5350-B8 Method 2 a Maximum 10.0 200 4 000 2 Minimum bond strength, MPa Grade E (ethyl cyanoacrylate) 17 17 17 Annex A Grade M (methy
18、l cyanoacrylate) 22 22 22 3 Rapid setting property Satisfactory if three successive joints can be made having bond strengths of not less than 2.4 MPa Annex B a Alternative methods for viscosity determination may be used where they have been shown to give equivalent results.BS 7969:2004 2 BSI 29 Janu
19、ary 2004 6 Shelf life When stored in the original unopened containers at temperatures between 5 C and 25 C, the material shall continue to comply with the requirements of this standard for a period of not less than six months from the date of manufacture. Unless otherwise specified in the contract o
20、r order, the adhesive shall be dispatched with at least two thirds of unexpired storage life remaining. 7 Containers and marking of containers 7.1 The material shall be supplied in sound, clean and dry containers suitable for the product and in accordance with any additional requirements of the cont
21、ract or order. Reject any consignment in contaminated containers. After filling, each container shall be securely closed. 7.2 It is the manufacturers responsibility to mark containers in accordance with any legal requirements. In addition, the containers constituting a consignment shall each be legi
22、bly and durably marked with the following details: a) designation, i.e.: “ADHESIVE, ETHYL CYANOACRYLATE (GRADE E)” or “ADHESIVE, METHYL CYANOACRYLATE (GRADE M)”, and “TYPE 1”, “TYPE 2”, or “TYPE 3” (as appropriate); b) contract or order number; c) distinctive batch number; d) quantity of contents; e
23、) date of expiry; f) manufacturers name, initials or recognized trade mark; and g) such other markings as may be prescribed in the terms of the contract or order. 7.3 The outer containers constituting a consignment shall be legibly and durably marked with the following details: a) designation, i.e.:
24、 “ADHESIVE, ETHYL CYANOACRYLATE (GRADE E)” or “ADHESIVE, METHYL CYANOACRYLATE (GRADE M)”, and “TYPE 1”, “TYPE 2”, or “TYPE 3” (as appropriate); b) British Standard number, i.e. BS 7969; c) contract or order number; d) distinctive batch number; e) quantity of contents; f) date of expiry; g) manufactu
25、rers name, initials or recognized trade mark; and h) such other markings as may be prescribed in the terms of the contract or order.BS 7969:2004 BSI 29 January 2004 3 Annex A (normative) Method of test for the determination of bond strength A.1 Outline The method described in BS 5350-C5:2002 shall b
26、e employed, modified with the following additional requirements. A.2 Adherend test pieces Twelve mild steel lap shear test pieces (3 mm 100 mm 25 mm) cut from flat sheet, free from burrs and meeting the flatness requirements of BS 5350-C5:2002, 5.1.2 shall be used. The thickness tolerance given in B
27、S 5350-C5:2002 for non-metal adherends shall be employed, i.e. (3.0 0.15) mm. A.3 Preparation of adherends A.3.1 General requirements The bonding surface shall be plane and free from visible signs of rust. A.3.2 Surface pre-treatment Remove loose contamination and oily deposits from the mild steel a
28、dherend by wiping with lint-free absorbent cloth, wetted with propan-2-ol. Allow to dry. Blast the bonding surface of the adherends with 80 4m silicon carbide grit and wipe again with propan-2-ol to remove grit. Allow to dry. A.4 Preparation of sample A.4.1 Apply a small drop of adhesive to the cent
29、re of a clean prepared face of the adherend. Immediately spread the adhesive evenly over the bonding area using the clean prepared face of a second adherend and bring the two surfaces into contact by means of the alignment jig shown in BS 5350-C5:2002, Figure 5a). Apply a pressure of 35 kPa, equival
30、ent to a mass of 1.115 kg for this joint configuration, to the bond. It is permissible to remove the mass from the jig after five minutes to make repeat specimens. Once the required number of specimens have been assembled, leave the weight on the bonded area for the duration of cure. A.4.2 The corre
31、ct quantity of adhesive is such that a small excess is forced out around the joint. Remove this excess, taking care not to upset the alignment whilst maintaining the pressure exerted by the weight. Prepare six joints using this method. A.5 Conditioning and testing A.5.1 Leave the assembled joints un
32、der pressure in the alignment jig and maintain the assemblies at 15 Ct o 2 5 C for 24 h. NOTE Since moisture catalyses the chemical reaction involved in bond formation, the curing time can be affected by the humidity of the air at the time of test. A.5.2 Test in accordance with BS 5350-C5:2002, 5.5
33、with the addition that a constant grip separation rate of 2 mm/min is acceptable. A.6 Expression of results Report the results as described in BS 5350-C5:2002, Clause 7 except that the mean of six determinations shall be expressed as the breaking shear stress in megapascals (MPa). Annex B (normative
34、) Method of test for the determination of rapid setting properties B.1 Principle The method is designed to determine the rapid setting properties of cyanoacrylates by preparing specimens as described in Annex A and assessing the strength after five minutes. B.2 Procedure Follow the procedure of A.1
35、through to A.3. Assemble an individual specimen as described in A.4, apply the weight for five minutes, remove from the jig and immediately test in accordance with A.5.2. Test a maximum of six specimens. B.3 Acceptance criteria The rapid setting property is satisfactory if three successive joints te
36、sted have a bond strength of not less than 2.4 MPa.BS 7969:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level.
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