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1、BRITISH STANDARD BS 5889:1989 Specification for One-part gun grade silicone-based sealants UDC 691.175.842:691.587:001.4:620.1 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5889:1989 This British Standard, having been prepared under the
2、 direction of the Elements and Components (of Diverse Materials) for Buildings Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 May 1989 BSI 03-1999 First published June 1980 First revision May 1989 The following BSI references relate to t
3、he work on this standard: Committee reference ECB/3 Draft for comment 87/11174 DC ISBN 0 580 17219 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Elements and Components (of Diverse Materials) for Buildings Standards Policy Committee
4、(ECB/-) to Technical Committee ECB/3, upon which the following bodies were represented: Aluminium Window Association Association of Sealant Applicators British Adhesives and Sealants Association British Tar Industry Association Building Employers Confederation Department of the Environment (Building
5、 Research Establishment) Flat Glass Manufacturers Association Glass and Glazing Federation Institution of Civil Engineers Refined Bitumen Association Ltd. Royal Institute of British Architects Society of Architectural and Associated Technicians Society of Chemical Industry Water Authorities Associat
6、ion Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5889:1989 BSI 03-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Classifi
7、cation1 4General1 5Skin forming time2 6Slump properties2 7Extrusion rate2 8Force on extension and elastic recovery2 9Loss of mass after heat ageing2 10Adhesion and cohesion in tension3 11Staining (sealants intended for use on cementitious materials)3 12Adhesion in peel3 13Marking and packaging3 Appe
8、ndix A Determination of skin forming time4 Appendix B Methods of test for adhesion and cohesion in tension4 Figure 1 Jig for extending or compressing sealant test assemblies6 Table 1 Summary of tests1 Table 2 Force on extension2 Table 3 Elastic recovery2 Publications referred toInside back cover Lic
9、ensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5889:1989 ii BSI 03-1999 Foreword This revision of this British Standard has been prepared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Poli
10、cy Committee and supersedes BS 5889:1980, which is withdrawn. The principal changes made in this standard from those shown in the 1980 edition are as follows: a) the classification in terms of the forces required to extend fully cured specimens by stipulated amounts has been altered. Type A is now #
11、 240 N at 100 % and type B is now 150 N to 450 N at 60 %; b) the specified recovery for type A sealants has changed from 50 % to 60 %; c) the maximum extension for type A sealants in the test for adhesion and cohesion after exposure to ultraviolet radiation through glass has changed from 50 % to 100
12、 %; d) where appropriate, cross-references to BS 3712 have replaced detailed descriptions of test methods. Other minor alterations have been made to bring the standard into line with BS 4254 and BS 5215. Product certification. Users of this British Standard are advised to consider the desirability o
13、f third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS 5750. Enquiries as to the availability of third party certification scheme
14、s will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport to include all the necessary provisions
15、 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 inside front cover, pages i and ii, pages 1 to 6, an insi
16、de 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 the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c
17、) BSI BS 5889:1989 BSI 03-19991 1 Scope This British Standard specifies requirements for two types of one-part gun grade chemically curing silicone-based sealant, namely type A, for use in building joints generally and type B, for use in glazing and sanitary ware applications. NOTE 1Primer systems a
18、re recommended for use with certain surfaces. The test requirements in this standard take account of such systems (see 4.3). NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following de
19、finitions apply. 2.1 one-part silicone-based sealant sealant that has as the sole reactive polymeric constituent a liquid polysiloxane polymer and that also contains other ingredients such as fillers and a curing system that is activated by exposure to moisture and cures to a rubber-like solid 2.2 g
20、un grade sealant sealant, suitable for application by extrusion gun, that does not slump when applied at ambient temperature in a joint of any aspect or inclination (see clause 6) 3 Classification For the purposes of this standard silicone-based sealants are classified as type A for use in building
21、joints generally and type B for use in glazing and sanitary ware applications. The classification of silicone-based sealants shall be determined by the tensile force required to extend them as described in 8.2. 4 General 4.1 Type tests Type tests shall be carried out, as given in Table 1, to prove t
22、he properties of sealants and shall be repeated whenever there is a change in the composition of the sealant or a change in the manufacturing process. 4.2 Test material All tests shall be carried out on sealant obtained from previously unopened containers that have been stored under the conditions s
23、tated on the package and before the expiry date see clause 13 e). 4.3 Priming When a particular primer is recommended by a manufacturer for a specific surface, that test surface shall be treated with the primer in accordance with the manufacturers instructions. NOTEAttention is drawn to the expiry d
24、ate on any primer that is used. Table 1 Summary of tests TestClause reference for requirement Reference for test methodCure conditions Skip forming time5Appendix ANot applicable Slump properties6Clause 8 of BS 3712-1:1985 See 4.5 Extrusion rate7Clause 6 of BS 3712-1:1985 Force on extension and elast
25、ic recovery 84.4.2 of BS 3712-4:1985 Loss of mass after heating9Clause 5 of BS 3712-4:1985 Adhesion and cohesion in tensionAppendix B Initial adhesion test10.2 Cyclic adhesion test10.3 After exposure to ultraviolet radiation through glass 10.4 Staining (for sealants used on cementitious surfaces) 11
26、2.2 of BS 3712-2:1973 Adhesion in peel12Clause 3 of BS 3712-4:1985 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5889:1989 2 BSI 03-1999 4.4 Test surfaces Standard test surfaces (aluminium, glass and cement mortar) shall be in accordanc
27、e with 3.2 of BS 3712-4:1985. NOTE 1Not all silicone sealants are suitable for use on cementitious substrates, even with a primer. Those that are suitable will be marked on the container (see clause 13) and shall be assessed on cement mortar surfaces in addition to aluminium and glass. NOTE 2Where t
28、he sealant is to be used on other test surfaces, it will be necessary to carry out the adhesion in peel test (see clause 12) using these test surfaces. 4.5 Conditioning Cure the assembly for 7 n days, where n is a whole number equal to or greater than 4, at 23 2 C and 65 5 % relative humidity. Obtai
29、n these conditions in a ventilated enclosure with air circulation. The number of days (7 n) curing shall be the same for all tests where cure is specified. 5 Skin forming time When one sample of sealant is tested as described in Appendix A a skin shall not form on the sealant within 5 min but shall
30、form within 360 min. 6 Slump properties Four test specimens shall be prepared and tested as described in clause 8 of BS 3712-1:1985, using channel reference number 4 (25 mm 12 mm). One of each test specimen shall be tested at one of the following conditions: a) vertically at 5 2 C; b) vertically at
31、50 2 C; c) horizontally at 5 2 C; d) horizontally at 50 2 C. The sealant shall not slump in vertical displacement by more than 2.0 mm when tested in a vertical position and shall not protrude in front of the original profile when tested in a horizontal position. 7 Extrusion rate When tested as descr
32、ibed in clause 6 of BS 3712-1:1985, using an air pressure of 250 kPa and using the test procedure in 6.2.4.3 b) and 6.2.4.4 the sealant shall have an extrusion rate of not less than 75 mL/min at both 5 1 C and 25 1 C. 8 Force on extension and elastic recovery 8.1 General The sealant shall be tested
33、at 23 2 C as described in 4.4.1 and 4.4.3 of BS 3712-4:1985 for tensile extension and elastic recovery respectively with the following provisos: a) the cure conditions shall be as specified in 4.5 of this standard; b) the spacer bars and/or polyethylene sheet shall be removed as soon as practicable;
34、 c) clear float glass test surfaces shall be used. 8.2 Force on extension The tensile force required to extend each assembly at 23 2 C shall be as shown in Table 2. Table 2 Force on extension The tensile force at the relevant extension shall be obtained from the force/strain diagrams for the three t
35、est assemblies. If one test assembly fails before the relevant extension indicated in Table 1 is attained, the test shall be repeated and three new assemblies shall be prepared and tested. All three test assemblies shall meet the requirements indicated in Table 1 for either type A or type B silicone
36、 sealants. Only one re-test is permitted. 8.3 Elastic recovery The recovery for each test assembly shall be as shown in Table 3. Table 3 Elastic recovery If one test assembly fails the elastic recovery test, the test shall be repeated and three new test assemblies shall be prepared and tested. All t
37、hree test assemblies shall satisfy this elastic recovery requirement. Only one retest is permitted. 9 Loss of mass after heat ageing When tested as described in clause 5 of BS 3712-4:1985 the loss of mass of each specimen shall not exceed 10 % and the sealant shall not exhibit any cracks, bubbles or
38、 chalking. Type of sealant Extension Tensile force Tensile stress %NN/mm2 A100# 240# 0.4 B60150 to 4500.25 to 0.75 Type of sealantRecovery A$ 60 % from 100 % extension B$ 90 % from 60 % extension Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:18:19 GMT+00:00 2006, Uncontrolled Copy, (c) B
39、SI BS 5889:1989 BSI 03-19993 If one specimen fails the test a second test shall be permitted. However, if any specimen fails the second test the sealant shall be considered not to comply with this standard. 10 Adhesion and cohesion in tension 10.1 General In each of the following tests, three test a
40、ssemblies for each surface on which the sealant is intended to be used (see 4.4) shall be made. The sealant shall be considered to comply with this standard if all three test assemblies, one for each substrate tested, meet the requirements given in 10.2, 10.3 and 10.4. Adhesion and cohesion shall me
41、et these requirements if the total area (length depth) of failure does not exceed 100 mm2per specimen. The depth of any crack shall be measured with the test specimen extended, using a suitable feeler gauge. If one test assembly fails, the test shall be repeated and three new assemblies shall be pre
42、pared and tested. All three test assemblies shall satisfy the requirements for adhesion and cohesion. Only one retest is permitted for each test. 10.2 Initial adhesion test The test assemblies shall be prepared and tested in accordance with B.4 and B.5 and shall withstand 7 days at 50 % extension fo
43、r type A sealants and 25 % extension for type B sealants, without failure as specified in 10.1. 10.3 Cyclic adhesion test The test assemblies shall be prepared and tested in accordance with B.4 and B.6 and shall withstand the cycle described without failure as specified in 10.1. 10.4 Adhesion and co
44、hesion after exposure to ultraviolet radiation through glass The test assemblies shall be prepared and tested in accordance with B.4 and B.7 and the sealant shall withstand 100 % extension for type A sealants and 60 % extension for type B sealants for 24 hours after exposure to ultraviolet radiation
45、 and water immersion, without failure as specified in 10.1. 11 Staining (sealants intended for use on cementitious materials) When tested as described in 2.2.3 of BS 3712-2:1973 a sealant intended for use on cementitious materials shall produce no staining on the primed or unprimed surfaces of the t
46、est mortar. NOTEThe method described in 2.2.3 of BS 3712-2:1973 tests staining by alkaline reaction of cementitious materials. If sealants are to be used with other materials, their propensity to stain other materials should be checked with the manufacturer. 12 Adhesion in peel When the sealant is t
47、ested as described in clause 3 of BS 3712-4:1985, using the cure conditions given in 4.5 of this standard, the average peel strength of four strips of backing materials for the glass, aluminium alloy and where required cement mortar test surfaces described in 3.2 of BS 3712-4:1985, shall be not less
48、 than 25 N and the material shall not fail in adhesion over more than 25 % of the test area. If only one strip of backing material on a test surface fails in adhesion over more than 25 % of the test area, a second test shall be permitted. However, if any strip fails this second test the sealant shal
49、l be considered not to comply with this standard. 13 Marking and packaging Each container of sealant shall be clearly and indelibly marked with the following information: a) the name or identification mark of the supplier or manufacturer; b) the number and date of this British Standard, i.e. BS 5889:19891); c) the type of sealant, namely A or B and the duration of cure when tested to determine this classification; d) the volume of the contents; e) batch number and expiry date; f) storage t