ICS 71.040.30 CCS G 63 T/CSTM 00164 E—2020 Life prediction of rubber sealing rings in liquid medium 橡胶密封圈在液体介质中的寿命评估 (English Translation) Issue d by Chinese Society for Testing & Materials, Zhongguancun Issue date: 2023-01-13 Implementation date : 2023-04-13 CSTMhQÆSÑ^Ou( 全国团体标准信息平台 T/CSTM 00164E —2020 Foreword CSTM /FC05/TC 11 (The Safety and reliability of chemical materials technical committee of chemical materials field committee of Chinese Society for Testing & Materials) is in charge of this English translati on. For the purposes of this translation , several changes (marked with *) of the Chinese original normative references have been made. In case of any doubt about the contents of English translation, the Chinese origina l shall be considered authoritative. This document is drafted in accordance with the rules given in the GB/T 1.1 —2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents . Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights. This document was proposed by Field Committee CSTM/FC05, Chemical materials . This document was prepared by Field Committee CSTM /FC05 , Chemical materials , Technical committee TC11, Safety and reliability . CSTMhQÆSÑ^Ou( 全国团体标准信息平台 T/CSTM 00164E —2020 Life prediction of rubber sealing rings in liquid medium 1 Scope This document specifies a test method to predict life of rubber sealing rings in liquid medium at working condition. This document is applicable to predict life of rubber sealing rings in liquid medium at working condition. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. *ISO 188:2011 Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests *ISO 815 -1:2014 Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient or elevated temperatures *ISO 23529:2016 Rubber -- General procedures for preparing and conditioning test pieces for physical test methods GB/T 27800 -2011 Determination of the life for static sealing rubber products 3 Principle The rubber sealing rings are subjected to comprehensive effect of heat, oxygen, mechanical stress and liquid media, and aging under working conditions. The elevated temperature will accelerated aging of the rubber sealing rings, which shows chemical changes such as rubber crosslinking and degradation in the microscopic view a nd changes in physical and mechanical properties in macroscopic view. Compression set and aging time show single change during aging. In a certain temperature range, the aging mechanism of rubber sealing rings at high temperature is the same as that under the working condition. 4 Test Pieces Use the finished product or part of the finished product of the rubber seal rings for the test. The compression deformation of the rubber seal rings should be more than 0.4mm under the working condition. 5 Apparatus 5.1 Thickness gauge The instrument for measuring the thickness of dumb -bell test pieces and the axial thickness of ring test pieces shall be in accordance with that used in method A of *ISO 23529:2016. CSTMhQÆSÑ^Ou( 全国团体标准信息平台