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Radial Lip Seals
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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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- Temperature range from -70°C to +260°C
- Lowest friction and power draw
- Long seal life because of wear resistant lip materials
- Almost universal chemical resistance (depending on lip material)
- Suitable for dry running and poorly lubricated conditions
- High shaft speed up to 36 m/s
- Exchangeable with standard lip seals according to DIN 3760
- For food or pharmaceutical industry
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- Shaft speed up to 30 m/s
- Pressure up to 10 bar
- Suitable for dry and poorly lubricated conditions
- Economical seal design
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Typ L
- low torque design
- shaft speed up to 40 m/s
- low friction torque
- suitable for dry running
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Typ MH
- with hydrodynamic feature on the sealing lip
- low friction
- higher flexibility of the sealing lip
- unidirectional shaft rotation
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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
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Typ MW
- same design as type M (but with an auxiliary wiper lip)
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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.
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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°
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Housing bore:
- tolerance H 8, ISO standard 286
- lead-in chamfer 5° - 15°
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Type M
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Shaft diameter [mm] x Outside diameter [mm] x Ring width [mm]
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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
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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
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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
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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
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Many of these dimensions are in stock. Special dimensions can be delivered within a short period of time.
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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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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
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Temperature Range
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| PTFE - virgin;
for food and pharmaceutical applications
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3 |
- 230 ... +190ºC |
| PTFE - with Carbon and Graphite;
good general properties
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8 |
- 100 ... +225ºC |
| PTFE - with Graphite;
good general properties
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7 |
- 130 ... +250ºC |
| PTFE - with Glass fiber and Graphite;
good wear resistance
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9 |
- 100 ... +260ºC |
| PTFE - with special filler;
good wear resistance, for unhardened stainless steel shafts
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9 |
- 100 ... +260ºC |
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Stainless steel (301,304)
Additional materials on request
- Chemical processing equipment
- Hydraulic motors
- Compressors
- Shafts on gearboxes
- Rotary
- Blowers
- Ventilators
- Actuators
- Rotary unions
- Encoders
- Mixers and Dryers
- Robotics
- Milling-machines
- Pumps of all kinds
- Pharmaceutical and food processing equipment
- Centrifugal machines
- Engines and Compressors crankshaft
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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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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© 2012 GFD - Gesellschaft für Dichtungstechnik mbH
Hofwiesenstraße 7, D-74336 Brackenheim, phone (+49 7135) 95 11-0, fax (+49 7135) 95 11-11 - Imprint
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