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1、International Standard $ 4635 0 1 4 4!Y!i INTERNATIONAL ORGANIZATION FOR STANOARDIZATION*ME)KLIYHAPOLIHAR OPI-AHM3AUHR llD CTAHAAPTH3Al#lI(WRGANlSATlON INTERNATIONALE DE NORMALISATIDN Rubber, vulcanized - Preformed compression seals for use between concrete motorway paving sections - Specification f
2、or material Caoutchouc vulcanis - Joints de compression pr 50 pphm ozone No cracking No cracking - severe conditions; ZOO pphm ozone No cracking No cracking Hardness increase, after 7,days at - 10 OC, max.* IRHD 15 10 Change In volume after immersion in water, for 7 days at standard laboratory tempe
3、rature, max. % oto+5 oto +5 Recovery of finished seal.* under 60 % deflection : - after 72 _ !j h at - 10 “C, min. % 88 86 - after 24 _ i h at -25 OC, min.* % 83 63 - after 72 _ i h at 100 OC, min. % 85 85 These low temperature tests are optional in the case of usage in tropical countries. * These l
4、imits are based on experience with chloroprene rubber. They may not be suitable for other polymers in use. For these, the limits shall be agreed between the interested parties. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Sta
5、ndards 1/9972545001 Not for Resale, 04/28/2007 07:29:10 MDTNo reproduction or networking permitted without license from IHS -,-,- Annex Determination of recovery A.1 Principle Determination of the ability of pre-formed seals to recover after being compressed under specified conditions. A.2 Test piec
6、es Test pieces of length of 125 mm shall be cut from the finished seal. Each test piece shall be used once only. When making tests at low temperatures, the test pieces may be lightly dusted with talc. A.3 Procedure Carry out the test in accordance with IS0 815, but with the following additions. A.3.
7、1 Measure the width in the middle of the test piece with the pressure foot well centred on the top longitudinal edge and the place of measuring marked on the test piece so that measurement before and after compression is made at the iden- tical position. A.3.2 Prior to compression, place the test pi
8、ece in a horizon- tal position such that the plane through both edges of the top surface of the seal is perpendicular to the compression plates. As the test piece is being compressed, the top surface of the seal should fold inward towards the centre of the test piece. Compress to 50 % of the origina
9、l width. A.3.3 For tests at - 10 OC, place a clamp assembly contain- ing the compressed test piece in a refrigerated box and main- tain it at a temperature of -10 OC for 72 _ i h. Then unclamp the test piece and allow it to recover for 1 h at - 10 OC. Measure the recovered width. A.3.4 For tests at
10、- 25 C, place a clamp assembly contain- ing the compressed test piece in a refrigerated box and main- tain it at a temperature of -25 OC for 24 _ s h. Then unclamp the test piece and allow it to recover for 1 h at -25 OC. Measure the recovered width. A.3.5 For tests at 100 OC, place a clamp assembly
11、 containing the compressed test piece in an oven and maintain it at a temperature of 100 OC for 72 _ i h. Do not preheat the clamp assembly. Unclamp the test piece and allow to cool at the stan- dard laboratory temperature (see IS0 471! on a wooden sur- face for 1 h. Measure the recovered width. A.4
12、 Calculation Calculate the test piece recovery R, expressed as a percentage, by the formula R=sx 100 Wl where w1 is the original width; w2 is the recovered width. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:29:10 MDTNo reproduction or networking permitted without license from IHS -,-,-