| Composite seals Type MRA/MRI are particularly well suited for sealing pistons and rods in hydraulic and pneumatic working cylinders.
They consist of two components:
- a profile ring made of the high-strength fluoro-plastic, PTFE, or alternatively from an ultra-high-molecular PE for dynamic sealing of the sliding surface (primary seal)
- an O-ring for static sealing in the groove area (secondary seal)
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Groove Dimensions
Depending on installation conditions, other profiles – differing from the standard dimensions provided – may be selected for composite seal type MRA (externally sealing) and type MRI (internally sealing). The respective groove dimensions are listed in the table below.
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Type MRA
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Skizze Einbauraum mit Maßen folgt
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| Profile Designation* |
Groove Depth T |
Groove Width G+0,2 |
Radius R max |
Radial Clearance max E/2 |
| 8 – 15 |
2,45 |
2,2 |
0,4 |
0,15 |
| 15 – 40 |
3,75 |
3,2 |
0,6 |
0,15 |
| 40 – 80 |
5,50 |
4,2 |
1,0 |
0,20 |
| 80 – 133 |
7,75 |
6,3 |
1,3 |
0,20 |
| 133 – 330 |
10,50 |
8,1 |
1,8 |
0,25 |
| 330 – 670 |
12,25 |
8,1 |
1,8 |
0,25 |
| 670 – 1000 |
14,00 |
9,5 |
2,5 |
0,30 |
| ≥ 1000 |
19,00 |
13,80 |
3,0 |
0,40 |
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Type MRI
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Skizze Einbauraum mit Maßen folgt
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| ProfileDesignation* |
Groove Depth T |
Groove Width G+0,2 |
Radius R max |
Radial Clearance max E/2 |
| 8 – 15 |
2,45 |
2,2 |
0,4 |
0,15 |
| 15 – 40 |
3,75 |
3,2 |
0,6 |
0,15 |
| 40 – 80 |
5,50 |
4,2 |
1,0 |
0,20 |
| 80 – 133 |
7,75 |
6,3 |
1,3 |
0,20 |
| 133 – 330 |
10,50 |
8,1 |
1,8 |
0,25 |
| 330 – 670 |
12,25 |
8,1 |
1,8 |
0,25 |
| 670 – 1000 |
14,00 |
9,5 |
2,5 |
0,30 |
| ≥ 1000 |
19,00 |
13,80 |
3,0 |
0,40 |
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Versions and Operating Limits
- Sliding speed max. 4 m/s ⇔
- Temperature range –45 °C to +200 °C
- Service pressure max. 400 bar
Fields of Application
- Double-acting piston and rod seal in hydraulic- and pneumatic cylinders
- Rod seal in coaxial valves
- Sealing hydraulically actuated pressure chambers
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Products 
