Radial Lip Seals


Radial Lip Seals with PTFE Sealing Lip

A reliable sealing for difficult and extreme working conditions

The new generation of GFD-rotary shaft lip seals were especially developed for useunder difficult and extreme conditions.
The superior properties of PTFE as lip material combined with a corrosion resistant stainless steel housing provide the particular advantages of these GFD-rotary shaft lip seals.

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Advantages and applications:

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Design example:

Design example

Standard-Type M:

Standard-Typ M

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Other Designs:

Typ L
Typ L 
  • low torque design
  • shaft speed up to 40 m/s
  • low friction torque
  • suitable for dry running
Typ MH
Typ MH 
  • with hydrodynamic feature on the sealing lip
  • low friction
  • higher flexibility of the sealing lip
  • unidirectional shaft rotation
Typ MD
Typ MD 
  • same design as type M (but with 2 lips)
  • high tightness, recommended for pumps and hydraulic motors
  • for pressurized service (MDP)
  • recommended if sealing plate is under a medium
Typ MW
Typ MW 
  • same design as type M (but with an auxiliary wiper lip)

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Special designs:

These special designs were developed for special applications. Any individual dimensions can be realized without considering dimensions lists ans standards. Special designs with hydrodynamic features as well as applications for the pharmaceutical industry are available. Larger diameters up to 2000 mm are possible.

Special design 1 Special design 2 Special design 3
Shaft finish:
  • hardness >= 45 HRC (for poor lubrication and high speed >= 58 HRC)
  • Ra = 0,2 - 0,8 µm
  • tolerance h 11, ISO standard 286
  • plunge grind surface finish
  • lead-in chamfer 15° - 30°
  Housing bore:
  • tolerance H 8, ISO standard 286
  • lead-in chamfer 5° - 15°

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Tool- and dimesion List:

Type M

Shaft diameter [mm] x Outside diameter [mm] x Ring width [mm]
  10 x 22 x 7
10 x 24 x 7
10 x 25 x 7
10 x 28 x 7
12 x 22 x 7
12 x 24 x 7
12 x 25 x 7
12 x 28 x 7
12 x 30 x 7
15 x 26 x 7
15 x 30 x 7
15 x 32 x 7
15 x 35 x 7
16 x 30 x 7
16 x 35 x 7
17 x 35 x 7
18 x 30 x 7
18 x 32 x 7
18 x 35 x 7
20 x 30 x 7
20 x 32 x 7
20 x 35 x 7
20 x 40 x 7
20 x 47 x 7
22 x 35 x 7
22 x 35 x 7
22 x 47 x 7
25 x 40 x 7
25 x 42 x 7
25 x 47 x 7
25 x 52 x 7
28 x 40 x 7
28 x 47 x 7
28 x 52 x 7
30 x 40 x 7
30 x 42 x 7
30 x 45 x 7
30 x 47 x 7
30 x 50 x 7
30 x 52 x 7
32 x 45 x 8
32 x 47 x 8
32 x 52 x 8
35 x 47 x 8
35 x 50 x 8
35 x 52 x 8
35 x 55 x 8
35 x 62 x 8
38 x 55 x 8
38 x 58 x 8
38 x 62 x 8
40 x 52 x 8
40 x 55 x 8
40 x 60 x 8
40 x 62 x 8
42 x 55 x 8
42 x 60 x 8
42 x 62 x 8
45 x 62 x 8
45 x 65 x 8
48 x 65 x 8
50 x 68 x 8
50 x 72 x 8
52 x 72 x 8
55 x 72 x 8
55 x 80 x 8
60 x 75 x 8
60 x 80 x 8
60 x 85 x 8
62 x 80 x 8
65 x 85 x 8
65 x 90 x 10
70 x 90 x 10
70 x 95 x 10
70 x 100 x 10
75 x 95 x 10
75 x 100 x 10
80 x 100 x 10
80 x 110 x 10
85 x 110 x 10
85 x 120 x 12
90 x 110 x 10
90 x 120 x 12
95 x 120 x 12
100 x 120 x 12
100 x 125 x 12
100 x 130 x 12
105 x 130 x 12
110 x 130 x 12
110 x 140 x 12
115 x 140 x 12
115 x 150 x 12
120 x 150 x 12
125 x 150 x 12
125 x 160 x 12
130 x 160 x 12
  

Many of these dimensions are in stock. Special dimensions can be delivered within a short period of time.

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Materials:

The sealing quality and the service life depend on the right choice of the design, the geometry of the seal lips and the lip material. Standard materials cover a great application range. This special compounds have proven themselves exceptionally well in years of use for radial lip seals.

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Lip materials:

Approximately 45 lip materials are available for special applications. Following please find a selection of materials:

Material Description Relative Wear Resistance
1 = low, 9 = high
Temperature Range
PTFE - virgin; for food and pharmaceutical applications 3 - 230 ... +190ºC
PTFE - with Carbon and Graphite; good general properties 8 - 100 ... +225ºC
PTFE - with Graphite; good general properties 7 - 130 ... +250ºC
PTFE - with Glass fiber and Graphite; good wear resistance 9 - 100 ... +260ºC
PTFE - with special filler; good wear resistance, for unhardened stainless steel shafts 9 - 100 ... +260ºC

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Housing materials:

Stainless steel (301,304)
Additional materials on request

Applications:

For the sealing of different media, such as water, oils, greases, cooling fluids, food and pharmaceutical products, aggressive as well as corrosive media, chemicals, adhesives, resins, air and gases etc.

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Technical Consultation and Service:

We will help you find the best solution for your seal problem.
Send us your drawing/sketch, working conditions (dimesions, shaft/housing material, operating speed, medium, pressure, life expectancy etc.).

All recommendations and data are based on the experience gained over decades of using those radial lip seals with PTFE sealing lip. Unknown factors and special conditions may restrict the generally valid promises. In critical cases we suggest tests with samples.

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