ISO-1432-1988.pdf
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1、INTERNATIONAL STANDARD IS0 1432:1988 TECHNICAL CORRIGENDUM 1 Published 2003-08-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION M W A P O f l H A R OPTAHHIHR no CTAHflAPTHIAUHH ORGANISATION INTERNATIONALE DE NORMALISATION Rubber, vulcanized or thermoplastic - Determination of low temperature stiffe
2、ning (Gehman test) TECHNICAL CORRIGENDUM 1 Caoutchouc vulcanis ou thermoplastique - Dtermination de la rigidit basse temprature (Essai Gehman) RECTIFICATIF TECHNIQUE I Technical Corrigendum 1 to IS0 1432:1988 was prepared by Technical Committee ISOTC 45, Rubber and rubber products, Subcommittee SC 2
3、, Testing and analyses. Page 4, Subclause 4.3 Change the last sentence in the seventh paragraph to read: “Measure all the test pieces in the rack in this way, ensuring that the measurements are completed within approximately 2 min.” Page 5, Subclause 4.4.1 Change the last sentence in the first parag
4、raph to read: “After this temperature has been maintained constant for 10 min, make the measurements in a similar way as in the liquid media, ensuring that all the test pieces in the rack are tested within 2 min.” ICs 83.060 Ref. No. IS0 1432:1988/Cor.l:2003(E) O IS0 2003 -All rights reserved Publis
5、hed 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 02:08:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 1432-88 I 4853703 0002845 o
6、r INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAR OPrAHM3AuMR no CTAHAAPTV13AuilM Rubber, vulcanized or thermoplastic - Determination of low temperature stiffening (Gehman test) Caoutchouc vulcanis ou thermoplastique -
7、Dtermination de la rigidit basse temprature (Essai Gehman) IS0 1432 Third edition 1988-12-15 Reference number IS0 1432 : 1988 (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
8、02:08:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 1432-88 I IS0 1432 : 1988 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards
9、 is normally carried out through IS0 technical 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
10、 part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as Inter
11、national 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 IS0 1432 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products. This third edition cancels and replaces
12、the second edition (IS0 1432: 19821, of which it constitutes a minor revision. 0 International Organization for Standardization, 1988 Printed in Switzerland 4853903 0002846 2 1 - Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical S
13、tandards 1/9972545001 Not for Resale, 04/25/2007 02:08:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 1432-88 4853903 0002847 4 INTERNATIONAL STANDARD IS0 1432 : 1988 (E) Rubber, vulcanized or thermoplastic - Determination of low temperature stiffening (Gehman test) 1 S
14、cope This International Standard specifies a static procedure, known as the Gehman test, for determining the relative stiffness characteristics of vulcanized or thermoplastic rubbers over a temperature range from room temperature to approximately - 150 OC. 2 Apparatus) 2.1 Torsion apparatus, one pos
15、sible form of which is shown in figure 1. It consists of a torsion head (A), capable of being turned lo in a plane normal to the torsion wire (B). The top of the wire is fastened to the torsion head through a loosely fitting sleeve (C). The bottom of the wire is fastened to the test piece clamp stud
16、 (Dl by means of a screw connector (E). A device for “friction-free“ indication or recording of angle by mechanical or electrical means shall be provided permitting convenient and exact adjustment of the zero point; the ap- paratus shown in the figure has a pointer (FI and a movable protractor (G) w
17、hich perform these functions. The indicating or recording system shall allow reading or recording of the angle of twist to the nearest degree. The torsion apparatus is clamped to a supporting stand (H). It is advantageous to make the vertical portion of the stand from material of poor thermal conduc
18、tivity. The base of the stand shall be of stainless steel or other corrosion-resistant material. 2.2 Torsional wires (BI, made of tempered spring wire, of length 65 mm i 8 mm, and having torsional constants of 0,7 mN.m, 2,81 mN.m and 11,24 mN.m. In cases of dispute, the 2,81 mN.m wire shall be used.
19、 2.3 Test piece rack (i), made of material of poor thermal conductivity, for holding the test piece (J) in a vertical position in the heat transfer medium. The rack may be constructed to hold several test pieces.2) The rack is clamped to the stand (HI. Two clamps shall be provided for holding each t
20、est piece. The bottom clamp (K) shall be a fixed part of the test piece rack. The top clamp (L) acts as an extension of the test piece and shall not touch the rack.3) The top clamp is secured to a stud (DI which in turn is connected to the screw connector (E). 2.4 Temperature-measuring device, capab
21、le of measuring the temperature to within 1 OC over the whole range of temperature over which the apparatus is to be used. The sensitive element shall be positioned near a test piece equidistant from the top and bottom. 2.5 Heat-transfer medium, which may be liquid or gaseous. Any material which rem
22、ains fluid at the test temperature and which will not affect materials being tested may be used. Among the liquids that have been found suitable for use at low temperatures are acetone, methanol, ethanol, butanol, silicone fluid and n-hexane. Air, carbon dioxide or nitrogen are commonly used gaseous
23、 media. Vapours of liquid nitrogen are useful for testing at very low temperatures. It should be noted that stiffness measurements in gaseous media may not give in each case the same results as the measurements made in liquid media. 2.6 Temperature control, capable of maintaining the temperature of
24、the heat-transfer medium to within * 1 OC. 2.7 Tank, for a liquid heat-transfer medium, or test chamber for a gaseous medium. 1 ) h e apparatus and its use are described in GEHMAN, S. D., WOODFORD, D. E., and WILKINSON, C. S., Low temperature characteristics of elastomers, lnd. and Eng. Chem., 39 Se
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