Datasheet

Technical Principles | O-Rings and Static Seals

Static Sealing

The sealing effect of the ISC O-Ring is attributable to

its axial or radial change of shape of its cross-section

once installed. This change of shape is achieved by

a corresponding designing of the installation space.

The resultant reactive force provides the seal with

the necessary contact pressure, which is additionally

supported by pressure from the medium.

ISC O-Rings can be used for the sealing of stationary

machine components, i.e. for static sealing. With the

proper fitting and the correct choice of material, pres-

sures of up to 1000 bar and more can be sealed. The

dimensions of the installation space depend on the

binding strength used and the respective application

conditions. The groove dimensions reveal, depending

on the ring thickness and application situation, a mean

compression under pressure of 15% to 30%. With pul-

sating pressures the hardness of the ISC O-Ring material

should not be less than 80 Shore A.

Selection of the material hardness is dependent on the

prevailing pressures and the specified tolerances

(gap widths); → Fig. 8 and Fig. 9.

Note: the specified groove dimensions are recommen-

dation and are taken from the nominal dimensions.

In any case a calculation of tolerances (minimum/

maximum) must be performed.

We recommend the following gradation:

Operating pressure Material hardness

≤16 MPa 70 Shore A

>16 MPa 90 Shore A

Tbl. 1

Un-pressurised

Deformed under pressure

Fig. 1