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.
