Datasheet

© Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007564
Technical Principles | O-Rings and Static Seals
Surfaces
Groove Application R
a
R
z
Groove base and
flanks
Static
Under non-pulsating pressure Axial (planar) 3,2 12,5
Radial (cylindrical) 1,6 6,3
Under pulsating pressure 1,6 6,3
Dynamic
With SR (back-up ring) 1,6 6,3
Without SR (back-up ring) 0,8 3,2
Rod and
cylinder wall
Static
Under non-pulsating pressure 1,6 6,3
Under pulsating pressure 0,8 3,2
Dynamic 0,4 1,6
Lead-in chamfer
3,2 12,5
Tbl. 12
5° max.
r
2
r
1
R
m
a
x
≤
2
5
R
m
a
x
≤
1
6
b
1
b
1
r
1
r
2
≤3 0,1 0,25
>3 0,2 0,50
Tbl. 13
With pulsating pressure, the surface roughness for the
mounting groove must be more finely finished. Instead
of the curvature r
2
at the base of the mounting groove,
an equally large facet with an angle of 45° can be
chosen. All machine parts that come into contact with
the ISC O-Ring must be carefully de-burred. All foreign
material must be removed before fitting.
Steel is usually used for rods and pipes. Clean, smooth
and non-porous cast iron is also suitable. Due to their
softness, aluminium, bronze or brass and stainless steels
show increased wear as a result of dynamic loading.
They are, however, also used for specific application
situations.
Facets of the rod or the housing
Due to fitting-related reasons, the rod and the housing
(max. angle 15°) should be bevelled.
The transitions should be carefully rounded off.
The dimensions for the depth of the facet Z are minimum
values and must be increased for shallower angles.
The ISC O-Ring should also abut against the bevel even
with extreme tolerances. Contact with the forward edge
can lead to ISC O-Ring damage.
15°
15°
Z
Z
Fig. 10 Edges rounded off burr-free