Standard No.:	JB/T 8872-2016
English Name:	Specification for carbon一graphite sealing ring for mechanical seals
Chinese Name:	机械密封用碳石墨密封环技术条件
Professional Classification:	JB    Professional Standard - Machinery
Source Content Issued by:	Ministry of Industry and Information Technology
Issued on:	2016-01-15
Implemented on:	2016-6-1
Status:	valid
Superseding:	JB/T 8872-2002 Specification for carbon-graphite sealing ring for mechanical seals
Target Language:	English
File Format:	PDF
Word Count:	5500 words
Translation Price(USD):	120.0
Delivery:	via email in 1 business day

Specification for carbon-graphite sealing ring for mechanical seals 1 Scope This standard specifies the product classification, requirements, test methods, inspection provisions, marking, packaging, transportation and storage of carbon-graphite sealing ring for mechanical seals. This standard is applicable to the selection of carbon-graphite sealing ring materials and the design of sealing rings for mechanical seals. 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 latest edition of the referenced documents (including any amendments) applies. GB/T 1184-1996 Genometrical tolerancing — Geometrical tolerances for features without individual tolerance indications GB/T 1958 Geometrical product specifications(GPS) — Geometrical tolerance — Verification prescription GB/T 2828.1 Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3177 Geometrical product specifications (GPS) — Inspection of plain workpiece sizes JB/T 2934 Carbon material an carbon products for mechanical engineering JB/T 8133.4 Test method for physical-chemical properties of electrical carbon product — Part 4: Shore hardness JB/T 8133.7 Test methods for physical-chemical properties of electric carbon products — Part 7: Transverse strength JB/T 8133.8 Test methods for physical-chemical properties of electric carbon products — Part 8: Compressive strength JB/T 8133.14 Test methods for physical-chemical properties of electric carbon products — Part 14: Volume density JB/T 8133.15 Test methods for physical-chemical properties of electric carbon products — Part 15: Porosity JB/T 9580 Classification and type arrangement method of carbon-graphite products 3 Product classification According to JB/T 9580, the classification of carbon-graphite sealing ring materials for mechanical seals is shown in Table 1 of this standard.

Foreword I 1 Scope 2 Normative References 3 Product classification 4 Requirements 5 Inspection methods 6 Inspection provisions 6.1 Inspection classification 6.2 Delivery inspection 6.3 Appraisal inspection 7 Marking, packaging, transportation and storage Annex A (Informative) Chemical resistance of carbon-graphite sealing ring materials Annex B (Informative) Carbon-graphite sealing ring friction coefficient and recommended matching material Annex C (Informative) Thermal performance parameters of carbon-graphite sealing ring (normal temperature ~ 200°C) Table 1 Classification of carbon-graphite sealing ring materials Table 2 Physical and mechanical properties of various carbon-graphite sealing ring materials Table 3 Flatness error of seal face 错误!未定义书签。 Table A.1 Chemical resistance of carbon-graphite sealing ring materials Table B.1 Friction coefficients and recommended matching materials for carbon-graphite sealing rings Table C.1 Thermal performance parameters of carbon-graphite sealing rings