《BS-5350-H1-1981.pdf》由会员分享，可在线阅读，更多相关《BS-5350-H1-1981.pdf（8页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 5350-H1: 1981 Methods of test for Adhesives Part H1: Determination of heat stability of hot melt adhesives in the application equipment UDC 665.93:620.192.424 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-H1:198
2、1 This British Standard, having been prepared under the direction of the Adhesives Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 July 1981 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ADC
3、/9 Draft for comment 80/50978 DC ISBN 0 580 12180 1 Foreword A hot melt adhesive may undergo irreversible changes during processing in the application equipment. The rate of change increases with temperature and the degree of change increases with time. Deterioration in performance is indicated by o
4、ne or more of the following changes: a) liquid phase separation; b) change in viscosity; c) skin formation and/or gel formation; d) sedimentation; e) discoloration. WARNING NOTE. This British Standard method does not necessarily detail all precautions necessary to meet the requirements of the Health
5、 and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
6、ir 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 and 2 and a back cover. This standard has been updated (see copyright date) and
7、 may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-H1:1981
8、 BSI 10-1999i Contents Page ForewordInside front cover 1Scope1 2Principle1 3Supplementary information1 4Apparatus1 5Procedure1 6Test report2 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na,
9、 Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-H1:1981 BSI 10-19991 1 Scope This Part describes a method for determining the stability of a hot melt adhesive during processing at elevated temperatures. The method does not apply to adhesives in the final bonded state. It is p
10、articularly applicable to hot melt adhesives used in processes or equipment where a reservoir of adhesive is kept molten at or near the application temperature. The test can be used in two ways: a) to examine test portions at intervals to determine the trend in the properties under investigation; b)
11、 to establish whether or not the adhesive meets the specified or agreed requirements, for example that its viscosity stays below a given value when the adhesive is held for a given period at a given temperature. The method of test is suitable for temperatures up to 300 C and a maximum ageing period
12、of three days. 2 Principle Test portions of the adhesive, each of a similar surface area to volume ratio, are aged in air at an elevated temperature. At appropriate intervals a test portion is inspected for skin formation, signs of gelation and liquid phase separation, and has its colour measured or
13、 compared and its viscosity measured. 3 Supplementary information The following data shall be established before the test is carried out (see also clause 6): a) the size and material of the containers to be used to hold the samples for ageing in the oven (see 4.2); b) the quantity of adhesive to be
14、placed in each container, if other than specified in 5.1; c) the ageing temperature; NOTEThe ageing temperature may or may not be the temperature recommended for the use of the adhesive but it is normally not more than 20 C above the maximum temperature of use. d) whether the containers are to be cl
15、osed or left open and if closed the nature of the closure; e) the temperature at which the viscosity is to be determined; f) the method by which colour is to be determined. If this is a visual assessment method then the size of the test portion and the type of observation shall be established. This
16、information shall be derived from the national standard or other document for the product under test or, where appropriate, shall be the subject of agreement between the interested parties. 4 Apparatus 4.1 Glass or metal containers, volume approximately 125 ml, height approximately 60 mm and diamete
17、r approximately 60 mm, with loose fitting covers (see note in 5.1). 4.2 Oven, with fan, capable of being controlled to 2 C. 4.3 Colour comparator with suitable glass colour standards (if needed). 5 Procedure 5.1 Preparation of test portions. Take a number of the containers equal to the number of tes
18、t periods appropriate to the stability of the adhesive plus an extra container. Weigh into each 100 g of the test sample (see note) at laboratory temperature and cover the containers. NOTEAdhesives based on ethylene vinyl acetate (EVA) polymers are more stable than adhesives based on other polymers.
19、 The maximum testing period may extend to three days for the former, but is usually less than 24 h for the latter. The 100 g test portion is typical of tests carried out on adhesives based on EVA polymers. For other types of adhesive where the testing times are shorter it may be necessary to use a s
20、maller test portion and a correspondingly smaller container. 5.2 Test procedure. Adjust the temperature of the test portion in one of the containers to the specified or agreed test temperature. Remove a small amount and either retain it for visual comparison of colour or allow it to cool and measure
21、 the colour using the colour comparator. Determine the viscosity of the remaining adhesive in the container using an appropriate method described in Part B8 “Determination of viscosity”. Place the remaining containers and contents in the oven controlled at the specified temperature. Note this time a
22、s the commencement of the test. After completion of each test period, remove one of the containers from the oven and examine the adhesive for skin formation, signs of gelation, liquid phase separation and sedimentation. If skin is present carefully remove it and mix the adhesive. Remove a small amou
23、nt and either compare the colour visually with the retained sample or allow it to cool and measure the colour with the comparator. Determine the viscosity by the same method as used for the initial test. If the adhesive shows signs of serious deterioration, such as liquid phase separation, terminate
24、 the test. NOTEIf necessary, this procedure may be repeated using a series of ageing temperatures. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-H1:1981 2 BSI 10-1999 6 Test report The report shall state the following: a) a designa
25、tion of the adhesive, giving all information required for complete identification of the sample; b) the items of supplementary information given in clause 3; c) the results of the test: 1) whether liquid phase separation occured and the test periods between which it occured; 2) the initial viscosity
26、 (in Pa s), the viscosity after each test period and the temperature of the determination; 3) the degree of skinning after each test period, i.e. no skinning, incomplete skinning of the surface, complete skinning covering the surface, or heavy skinning; 4) the test periods between which particles of
27、 gel formed; 5) whether sedimentation occurred and the time at which it occurred; 6) the initial colour and the colour after each test period; d) that the method of test complied with the requirements of this standard, i.e. BS 5350-H1, or if it did not the respects in which it did not, together with
28、 full details of the particular apparatus used. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5350-H1: 1981 BSI 389 Chiswi
29、ck 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. It is incorporated by Royal Charter. Revisions British Standards are updated b
30、y amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Stan
31、dard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest
32、editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those
33、 that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services
34、 are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For detail
35、s of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyr
36、ight, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the
37、standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:59:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI