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0086-574-87527773
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No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
Die-formed rings are not braided packing cut into circles. They are molded under controlled pressure from flexible graphite to reach a target density, dimensional tolerance, and permeability — which is why they hold gland load where braided packing extrudes, and why the process has to be documented, not just claimed.
Request Ring Specification →Flexible graphite grade selected for carbon content, ash, and intended service temperature.
Mold dimensioned to the ring OD, ID, and thickness; pressed per drawing.
Controlled pressure to reach target density, with density recorded per batch.
Dimensional check, edge finishing, and thickness tolerance verification.
Density, compressive strength, carbon content, and ash measured on the lot.
Ring stacks labeled with batch ID for traceability and MTR linkage.
| Parameter | Range | Notes |
|---|---|---|
| Outer diameter | Up to 1,500 mm | Larger on request with new mold |
| Inner diameter | Per drawing | Tolerance per application |
| Thickness | 3 mm – 50 mm | Non-standard by drawing |
| Density | Controlled per batch | Recorded on test report |
| Max temperature | 455 °C air / 650 °C steam | Grade dependent |
| Max pressure | Up to 25 MPa | Valve and pump service |
0086-574-87527773
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China