Datasheet

© Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007 563
Technical Principles | O-Rings and Static Seals
p
p
Correct
Incorrect
Fig. 8
p
p
Incorrect
Correct
Fig. 9
Fits and gap widths
The fits stated in the installation lists must be adhered to.
Any changes that could lead to an enlargement of the
gap width are to be avoided. With too large of a gap,
the danger exists that the ISC O-Ring under pressure
will be pressed into it and destroyed.
The values for the permissible gap widths can be found
in → Diagram 1 and → Diagram 2.
Gap widths for stationary machine
components
When using back-up rings made of PTFE, gap widths
of up to 0,3 mm can be bridged at operating pressures
of up to 40 MPa.
0,3
0,25
0,2
0,
1
5
0,1
0,05
63
250210160100
O
R
9
0
Shore
A
O
R
7
2
S
h
o
r
e
A
bar
Gap width g
Back-up ring necessary
mm
Diagram 1
Gap widths for axially moving machine parts
When using back-up rings made of PTFE, gap widths
of up to 0,3 mm can be bridged at operating pressures
of up to 25 MPa.
0,25
0,2
0,
1
5
0,1
0,05
0,3
3016 100
63
O
R
9
0
S
h
o
r
e
A
O
R
7
2
S
h
o
r
e
A
bar
Gap width g
Back-up ring necessary
mm
Diagram 2