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1、INTERNATIO.NAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MENYHAPOAHAR OPl-AHM3Al#lR I-IO CTAHAAPTM3AqMM Rubber, vulcanized - Preparation of samples and test pieces - Part 2 : Chemical tests Caoutchouc vulcani. - Pr&aration das khantilons et
2、t5prouvettes - Partie 2 : Essais chimiques IS0 4661-2 First edition 1987-02-01 Reference number IS0 4661-2 : 1987 (E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:11:50 MDT
3、No reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the international Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 techn
4、ical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft international Stan
5、dards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard I
6、S0 4651-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 Int
7、ernational Organization for Standardization, 1987 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:11:50 MDTNo reproduction or networking permitted wit
8、hout license from IHS -,-,- INTERNATIONAL STANDARD IS0 4661-2 : 1987 (E) Rubber, vulcanized - Preparation of samples and test pieces - Part 2 : Chemical tests 0 Introduction International Standard IS0 4561 for the preparation of samples and test pieces for rubber testing comprises two parts : - Part
9、 1 : Physical tests. - Part 2 : Chemical tests. This part of IS0 4551 includes a number of factors of impor- tance in the preparation of samples for chemical testing, in order to ensure the best use of the relevant IS0 methods of test. When preparing samples of vulcanized rubber for chemical testing
10、, care should be taken that any test portion is represen- tative of the sample with respect to the property or constituent to be determined. Thus, if it is desired to deduce the composi- tion of the original mix, any surface bloom should be incor- porated, but if the final bulk composition is requir
11、ed, bloom should be removed preferably by using mechanical means. In the case of tests carried out with test pieces taken from manufacturer s products, it may be necessary first to separate vulcanized rubber from other possible components of the manufactured products, such as metals, threads, tapes,
12、 fabrics as well as coatings or veneers that may cover if. This separation should be made using whenever possible mechanical means - blades, abrasive wheels, files, etc. - and avoiding any heat generation. 1 Scope and field of application This part of IS0 4661 specifies a method of preparing samples
13、 from vulcanized rubber for use in chemical tests. 2 Preparation of samples 2.1 Soft vulcanized rubber The sample shall be comminuted with scissors, a rotating rasp, a suitable grinder or by cryogenic crushing to pass a sieve with an approximately I,7 mm opening. Alternatively, if shall be sheeted t
14、o a thickness not exceeding 0,5 mm by passing be- tween cold, tightly closed rolls of a laboratory mill. The type of grinder or mill used is immaterial, provided that the sample does not become contaminated or unduly heated. 2.2 Ebonite The sample shall be rasped to powder which will pass a sieve wi
15、th an approximately 400 urn opening. The powder shall be treated with a magnet to remove any iron particles. 2.3 Rubberized composites Where it is not possible to separate the rubber mechanically, the following procedure shall be carried out. The rubber shall be separated by exposing it to the vapou
16、r only of a suitable solvent. For composites based on NR, SBR and BR, methylene chloride or l,l,l-trichloroethane are suitable solvents. NOTE - The time of exposure should be kept as short as possible to avoid any possibility of extracting plasticizers from the rubber com- pound. Afterwards, the swo
17、llen rubber shall have the solvent com- pletely removed in air at room temperature and treated as described in 2.1. In cases where the rubber is chemically bonded to the substrate, it should be noted that the composition of the rubber in the region of the bond may be substantially different from tha
18、t in the bulk of the material. In all cases, sampling shall be appropriate to the test being carried out. Even if the substrate can be removed “clean”, the remaining rubber may consist of more than one formulation, and the blending carried out subsequently in accordance with 2.1 may result in a samp
19、le for analysis which is not represen- tative of any one original formulation. Such composite layers may be revealed by microscopic examination of a series of cross-sections of the material. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NA
20、SA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:11:50 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4661-2 : 1887 (EI It may then be possible, by careful buffing or cutting, to pro- duce a sample of one or more rubber components for individual analys
21、is. Where it is impossible to separate the rubber from the substrate, the material shall be cut into a small cubes to pass a sieve with 2 mm openings, and analysed as a whole. In this case, the proportion by mass of rubber in the composite may be determined by disintegration of the rubber in a hot h
22、igh boiling solvent, and weighing before and after the treatment. It should be noted that there may be partial dissolution of any organic material in the composite (for example, fabric), and the results should be interpreted with caution. Where available, a sample of the non-rubber portion of the co
23、mposite should also be analysed similarly. In reporting the results of any analysis, the method of separa- tion used shall be specified. If separation was impossible, it shall be made clear that the sample analysed was a heteroge- neous blend of rubber and substrate and the possibility of error due
24、to inhomogeneity or inadequate separation of materials should be pointed out. UDC 678.4 : 620.115 Descriptors : rubber, vulcanized rubber, tests, chemical tests, test specimens, specimen preparation. Price based on 2 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:11:50 MDTNo reproduction or networking permitted without license from IHS -,-,-