Standard No.:	JB/T 6639-2015
English Name:	Rolling bearing parts—Skeleton acrylonitrile-buta-diene copolymers seal-Specifications
Chinese Name:	滚动轴承 骨架式橡胶密封圈 技术条件
Professional Classification:	JB    Professional Standard - Machinery
Issued by:	Ministry of Industry and Information Technology
Issued on:	2015-10-10
Implemented on:	2016-3-1
Status:	valid
Superseding:	JB/T 6639-2004 Rolling bearing parts—Skeleton acrylonitrile-buta-diene copolymers seal-Specifications
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	80.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the technical requirements, inspection and assessment methods, inspection rules for sizing material, sheet steel insert and finished products of rubber seals reinforced with a sheet steel insert (hereafter referred to as seal ring) for rolling bearings as well as the marking, packaging, transportation and storage methods. This standard is applicable to inspection and acceptance of materials and finished product quality of rubber seals reinforced with a sheet steel insert. As for inspection and acceptance of materials and finished product of rubber seals without sheet steel insert, this standard may be executed by reference. 2 Normative References The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document. GB/T 528-2009 Rubber , Vulcanized or Thermoplastic - Determination of Tensile Stress-strain Properties GB/T 531.1-2008 Rubber Vulcanized or Thermoplastic - Determination of Indentation Hardness - Part 1: Duromerer Method (Shore Hardness) GB/T 1689-1998 Rubber Vulcanized - Determination of Abrasion Resistance (Akron Machine) GB/T 1690-2010 Rubber, Vulcanized or Thermoplastic - Determination of the Effect of Liquids GB/T 2361-1992 Rust Preventing Oils and Greases - Test Method of Wet Heat GB/T 2828.1-2012 Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection GB/T 3512-2001 Rubber, Vulcanized or Thermoplastic - Accelerated Ageing and Heat Resistance Tests - Air-oven Method GB/T 5213-2008 Cold Rolled Low Carbon Steel Sheet and Strip GB/T 5721-1993 General Rules of Identification, Packaging, Transportation and Storage for Rubber Sealing Products GB/T 7759-1996 Rubber, Vulcanized or Thermoplastic - Determination of Compression Set at Ambient Elevated or Low Temperatures GB/T 11211-2009 Rubber Vulcanized or Thermoplastic - Determination of Adhesion to Metal - Two-plate Method GB/T 13237-1991 Cold-rolled Quality Carbon Structural Steel Sheets and Strips GB/T 15256-1994 Rubber, Vulcanized - Determination of Low-temperature Brittleness (Multiple Test Piece Method) 3 Technical Requirements 3.1 Sizing material for seal ring 3.1.1 Sizing materials for seal ring are nitrile rubber (NBR), modified nitrile rubber, polyacrylate rubber (ACM), hydrogenated nitrile rubber (HNBR) and fluororubber (FPM). Technical performance indexes of sizing materials shall be in accordance with those specified in Table 1; as for non-contact seal ring, the inspection on the items of abrasion volume is unnecessary. After determination through negotiation with the user, modified types of the above-mentioned sizing materials or other sizing materials meeting the service performance requirements may also be adopted.

Foreword i 1 Scope 2 Normative References 3 Technical Requirements 4 Inspection Method 5 Inspection Rules 6 Marking, Packaging, Transportation and Storage Appendix A (Normative) Method for Seal Ring Acetone Immersion Test Appendix B (Normative) Test Method for Dimensional Stability of Seal Ring in Lubricating Grease and Antirust Oil