It is made from Asbestos mill -board, Expanded Graphite, Ceramic etc. filler, cnvered with thin metal jacket, such as stainless steel, carbnn steel, copper etc. special used in sealing spots of thermal exchanger, pressure vessel, etc.
| NO. | Description |
| JBD-8501 | Single-jacketed |
| JBD-8502 | Wholly-jacketed |
| JBD-8503 | Corrugated-jacketed |
| JBD-8504 | Corded-jacketed |
| JBD-8505 | Double-jacketed |
| Another kinds jacketed |