1 Scope
This standard specifies requirements, inspection, marking, packaging and storage of flexible graphite ring (hereinafter referred to as "the ring").
This standard applies to flexible graphite ring.
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 document (including any amendments) applies.
GB/T 1800.2-2009 Geometrical Product Specifications (GPS)—Limits and Fits—Part 2: Tables of Standard Tolerance Grades and Limit Deviations for Holes and Shafts
GB/T 1801 Geometrical Product Specifications (GPS)—Limits and Fits—Selection of Tolerance Zones and Fits
GB/T 29035 Test Method for Physical-Mechanical Performance of Flexible Graphite Ring
JB/T 7758.2 Specifications of Flexible Graphite Sheets
3 Requirements
3.1 Materials
The sulfur content, chlorine content and ash content of flexible graphite ring shall meet the requirements of JB/T 7758.2 and the metal materials shall comply with relevant standards unless otherwise specified by the mutual agreement if the users have special requirements for the materials.
3.2 Appearance
3.2.1 The ring surface shall be free of defects like obvious scratch and flash.
3.2.2 The ring may be cut either into single opening or double opening by 45° (in some cases, 60°) as needed by installation, as shown in Figure 1 and Figure 2. The cuts shall be flat and smooth without loose circle.
Foreword i
1 Scope
2 Normative References
3 Requirements
3.1 Materials
3.2 Appearance
3.3 Dimensional Limit Deviation
3.4 Performance
4 Inspection
4.1 Inspection Types and Inspection Items
4.2 Inspection Methods
4.3 Sampling and Judgment Rules
5 Marking and Packaging and Storage
5.1 Marking
5.2 Packaging
5.3 Storage
