1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21857-7 SANS 5876:2008Edition 2SOUTH AFRICAN NATIONAL STANDARD Ozone resistance of vulcanized rubbers (RAPRA-Hampden method) Published by
4、SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 5876:2008 Edition 2 Table of changes Change No. Date Scope Foreword This South African standard was approved by National Committee SABS TC 45, Rubber
5、and rubber products, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in November 2008. This document supersedes SABS SM 876:1976 (first edition). This document is based on ISO 1431. SANS 5876:2008 Edition
6、2 1 Contents Page Foreword 1 Scope 3 2 Normative references 3 3 Apparatus 3 4 Preparation of test specimens . 4 5 Procedure 4 SANS 5876:2008 Edition 2 2 This page is intentionally left blank SANS 5876:2008 Edition 2 3 Ozone resistance of vulcanized rubbers (RAPRA-Hampden method) 1 Scope This standar
7、d specifies the procedure for testing the ozone resistance of vulcanized rubbers (RAPRA-Hampden method). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the
8、 latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from the SABS Standards Division. SANS 5867 (SABS SM 867), Preparation of samples of vulcanized rubbers for testing. SANS 5868 (SABS SM 8
9、68), Conditioning of vulcanized rubbers. 3 Apparatus 3.1 Ozone generator An ozone generator capable of supplying an ozone concentration of (200 20) parts per hundred million of air to the exposure chamber. The ozonized air shall be free from nitrogen oxides, oil, dust and other contaminants, and sha
10、ll be heated to a temperature of (40 2) C before entering the exposure chamber. 3.2 Exposure chamber A thermostatically controlled chamber maintained at a temperature of (40 2) C, and fitted with equipment for determining the ozone concentration in the chamber. 3.3 Clamps A set of clamps capable of
11、holding specimens at an elongation of 20 %. 3.4 Lens A lens of 10 magnification. SANS 5876:2008 Edition 2 4 4 Preparation of test specimens From each test sample after, when relevant, preparing it in accordance with SANS 5867, cut three straight strips of width not less than 10 mm, thickness (2,0 0,
12、2) mm and length approximately 10 mm, and condition them in accordance with SANS 5868. 5 Procedure 5.1 Place the specimens in the clamps and elongate them by 20 %. 5.2 Coat the edges of the specimens and the ends adjacent to the clamps with an ozone-resistant material such as one based on chlorosulfonated polyethylene. 5.3 Place the specimens in the exposure chamber for 48 h 1 h, then remove them from the chamber and, using the lens, inspect them for any sign of cracks. SABS
