Datasheet

Technical Principles | O-Rings and Static Seals

Dynamic Sealing

With dynamic sealing, a distinction must be made

between hydraulics and pneumatics in ISC O-Ring

applications. Due to the friction resistance, the defor-

mation is minimised compared with static seals. Suf-

ficient lubrication from the medium to be sealed with

hydraulics, or by means of an aerosol lubricator with

pneumatics, reduces losses due to friction and wear.

We recommend the following gradation:

Operating pressure Material hardness

≤6,3 MPa 70 Shore A

>6,3 MPa 90 Shore A

Tbl. 6

Hydraulics – axial movement

With hydraulics, ISC O-Rings are only used as rod or

piston seals where there is a small installation space

for a sealing component, where short stroke distances

with relatively infrequent stroke cycles occur and no

absolute sealing effect is required.

The minimum cross-section deformation should not ex-

ceed 6%. This can be determined by a comparison of

the greatest groove depth and smallest ring thickness in

terms of tolerances.

The installation dimensions can be found in the follow-

ing table. The dimensions for the length of the facet Z

are minimum values.

Hydraulics – oscillating movements

ISC O-Rings can also be used for sealing shafts with a

reciprocating movement and at the same time with a

turning or pivoting motion. The installation dimensions

for these can also be found in the following table.