Advantages:
-Good chemical resistance and abrasion resistance.
-Improve the extrusion resistance of the seal, thereby increasing the service life of the seal.
Importane Notes:
- The seal can not be used alone, must be used in conjunction with the piston rod seal
- When system pressure is high, PA material is recommended.
- All the back-up rings are divided into integral and open two forms.
| ITM | ID | OD | H |
| JSBRT | 25 | 35 | 2 |
| JSBRT | 30 | 40 | 2 |
| JSBRT | 30 | 40 | 3 |
| JSBRT | 30 | 43 | 3 |
| JSBRT | 32 | 42 | 2 |
| JSBRT | 32 | 48 | 3 |
| JSBRT | 35 | 45 | 2 |
| JSBRT | 35 | 45 | 3 |
| JSBRT | 40 | 50 | 2 |
| JSBRT | 40 | 50 | 3 |
| JSBRT | 40 | 55 | 3 |
| JSBRT | 45 | 55 | 2 |
| JSBRT | 45 | 55 | 3 |
| JSBRT | 45 | 60 | 3 |
| JSBRT | 50 | 60 | 2 |
| JSBRT | 50 | 60 | 3 |
| JSBRT | 50 | 63 | 3 |
| JSBRT | 50 | 65 | 2 |
| JSBRT | 50 | 65 | 3 |
| JSBRT | 50 | 70 | 2 |
| JSBRT | 55 | 65 | 2 |
| JSBRT | 55 | 68 | 3 |
| JSBRT | 55 | 70 | 3 |
| JSBRT | 60 | 70 | 2 |
| JSBRT | 60 | 70 | 3 |
| JSBRT | 60 | 73 | 3 |
| JSBRT | 60 | 75 | 3 |
| JSBRT | 65 | 78 | 3 |
| JSBRT | 65 | 80 | 3 |
| JSBRT | 70 | 80 | 2 |
| JSBRT | 70 | 80 | 3 |
| JSBRT | 70 | 83 | 3 |
| JSBRT | 70 | 85 | 2 |
| JSBRT | 70 | 85 | 3 |
| JSBRT | 75 | 88 | 3 |
| JSBRT | 75 | 88 | 4 |
| JSBRT | 75 | 90 | 3 |
| JSBRT | 75 | 95 | 3 |
| JSBRT | 80 | 93 | 3 |
| JSBRT | 80 | 95 | 2 |
| JSBRT | 80 | 95 | 3 |
| JSBRT | 85 | 100 | 2 |
| JSBRT | 85 | 100 | 3 |
| JSBRT | 85 | 100 | 4 |
| JSBRT | 90 | 105 | 2 |
| JSBRT | 90 | 105 | 3 |
| JSBRT | 90 | 110 | 3 |
| JSBRT | 95 | 110 | 2 |
| JSBRT | 95 | 110 | 3 |
| JSBRT | 95 | 115 | 3 |
| JSBRT | 100 | 115 | 2 |
| JSBRT | 100 | 115 | 3 |
| JSBRT | 100 | 120 | 3 |
| JSBRT | 105 | 120 | 2 |
| JSBRT | 105 | 120 | 3 |
| JSBRT | 110 | 125 | 2 |
| JSBRT | 110 | 125 | 3 |
| JSBRT | 110 | 130 | 3 |
| JSBRT | 115 | 130 | 2 |
| JSBRT | 115 | 130 | 3 |
| JSBRT | 120 | 135 | 2 |
| JSBRT | 125 | 140 | 2 |
| JSBRT | 125 | 140 | 3 |
| JSBRT | 130 | 145 | 2 |
| JSBRT | 145 | 160 | 2 |