PTFE Seals
General Information
The Eurosealings spring energized PTFE seal is the newest generation of spring actuated Teflon seals. These seals consist of a special precision jacket/lip made of Teflon (or other high performance polymers) and a corrosion resistant stainless steel spring.
In this combination, the spring is forcing the seal lips against the gland and the rod walls. The pressure assists the spring force.
The spring compensates the lip wear, hardware tolerances, eccentricities and provides permanent resilience to the seal lips. The Eurosealings design with sealing lip and spring arrangement guarantees more leakage protection than conventional lip seals.
More than 50 different PTFE compounds (and other high performance polymers) are available or can be composed for jacket fabrication within a very short time.
The standard designs cover radial and axial seals for dynamic as well as static applications.
In addition to standard designs, we are also able to produce designs made to specification for special applications (silicone filled, sanitary seals, ultra low friction seals, etc.).
A wide variety of materials, dimensions, and designs provide the opportunity to solve difficult sealing problems.
Radial Seals
(Piston- and Rod Seals)
Type 400 |
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Some Design Variations of Type 400 | |
Type 401 | ![]() |
sharp scraper-lip on the inside-diameter | |
Type 402 | ![]() |
sharp scraper-lip on the outside-diameter | |
Type 4VS | ![]() |
chamfered seal-lips | |
Type 414 | ![]() |
type 400 with flange | |
Type 4FM | ![]() |
with silicone filled spring cavity for food processing and sanitary applications FDA-approved |
Type 103 |
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Some Design Variations of Type 103 | |
Type 113 | ![]() |
sharp scraper-lip on the inside-diameter | |
Type 123 | ![]() |
sharp scraper-lip on the outside-diameter | |
Type 103H | ![]() |
extended seal-back for high pressure | |
Type 143 | ![]() |
type 103 with flange |
In addition to these listed standard sizes, we can ship special designs in each sizes and cross sections. We will make recommendations by our Engineering Department.
Axial Seals
Face Seals for Static and Rotary Service
For Internal Pressure | |
Typ 403 | ![]() |
Dynamic and static applications. Low seal friction. | |
Typ 304 | ![]() |
Dynamic and static applications. Higher spring force. For higher pressure. | |
Typ 1100 | ![]() |
Static and slow dynamic service. High loaded spring for lowest leakage and low temperatures. | |
Typ 2100 | ![]() |
Static and slow dynamic service. Extra large deflection range of spring. |
For External Pressure/Vacuum | |
Typ 404 | ![]() |
Dynamic and static applications. Low seal friction. | |
Typ 314 | ![]() |
Dynamic and static applications. Higher spring force. For higher pressure. | |
Typ 1101 | ![]() |
Static and slow dynamic service. High loaded spring for lowest leakage and low temperatures. Good vacuum seal, low gas permeability. |
In addition to these listed standard sizes, we can ship special designs in each sizes and cross sections. Please send us back the application data form. We will make recommendations by our Engineering Department.
Seals selection and operation range
The wide variety of types provide the opportunity to meet all sealing requirements for axial and radial seals. Not all maximum stresses can be applied to the seal at one time.
The variety of designs, jacket and spring materials, together with several springs and dimensions allow sealing applications within the following working ranges:
- Temperatures from -250°C to +316°C
- For rotation and reciprocating movement up to 5 m/s
- For static applications up to 3500 bar pressure
- For dynamic applications up to 550 bar pressure
- Universal chemical-resistant
- For vacuum and UHV applications
- Diameter from 2 mm up to 3000 mm
Materials
Seal Jacket Materials:
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Additional sealing materials in stock. We can compound seal jacket materials for optimal performance. This is why we are able to offer a wide variety of sealing materials. We can offer more than 50 different compounds. Only the most frequently used compounds have been listed above.
Spring Energizer Materials:
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Hardware and groove dimensions
Radial Seals:
For Types 400, 401, 402, 4VS, 4FM, RP, RS, 103, 113, 123, 103H, etc.
Rod Seals:
For rod seals use the dimension B for Nominaldimension.
Dimension B = rod diameter
Piston Seals:
For piston seals use the dimension A for Nominaldimension.
Dimension A = cylinderbore diameter
Groove Dimensions - Radial Seals:
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We can also ship special sizes, special designs, each diameter and dimensions between 2 mm and 2000 mm diameter.
Axial Seals:
For Types 403, 304, 1100 and 2100 for internal pressure, and Types 404, 314, 1101 for external pressure and vacuum.
Seals for internal pressure use the outside diameter OD as Nominal diameter. (Nominal diameter = groove outside diameter).
Seals for external pressure and vacuum use the inside diameter ID as Nominal diameter. (Nominal diameter = groove inside diameter).
Groove Dimensions - Axial Seals:
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We can also ship special sizes, special designs, each diameter and dimensions between 2 mm and 2000 mm diameter.
Kalrez® and Viton® are registered trademarks of DuPont Dow Elastomers.
Groove dimensions PTFE seals type 413 and 143
Radial and Axial Dimension
The seals type 414 and 143 respectively are designed with flange for the axial fixation and/or securing of rotation with rotary seals. Other dimensions are possible as well.
Groove dimensions seals with flange
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Dimension B will be specified by the customer
Quality of finish for rotary seals
The sealing surface should possess a material portion Mr (in former times bearing portion tp) of approx. 50 to 70% measured in a cutting depth c = 0.25 x Rz
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Hardness of finish for rotary seals
With rotary sealing cases we recommend a hardness of finish of at least 55 HRC.
The depth of hardness should amount at least to 0.4 - 0.4 mm.
Surface finish
(Rod and housing)
The life expectancy of the seal and the sealing quality is also directly dependent upon the quality of the sealing surface.
We recommend the following surface finish.
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Sterilisable seals and integral piston seals
Especially for filling machines and aseptic applications
Universal chemical-resistant and elastic PTFE-seals for especially aggressive media, also suited for sterilisable and FDA-approved sealing elements for food and pharmaceutical drugs.
The material characteristics of high grade fluorsynthetic materials, such as PTFE, PFA, PCTFE, etc. and acid-resistant spring steel are combined in these spring-elastic sealing elements in an ideal manner.
The spring made of corrosion-resistant steel (e.g. 1.4568 Hastelloy C, etc.) embedded high and durable alsticity, sets off cold flow and wear of the sealing lip and effects defined low sealing forces.
Depending on material selection these sealing elements are universally chemical-resistant. These sealing elements were developed, above all, for sealing of especially aggresive media and the sterilisable seals for foodstuff and pharmaceutical drugs filling systems.
The advantages of Eurosealings seals:
- Universal chemical-resistant
- Durable elasticity because of an integrated stainless steel spring
- Sterilisable for foodstuff or pharmaceutical applications
- Capsulated or totally sealed stainless steel spring
- Highest wear resistance and lowest friction forces
- Suitable class="table" for high and low temperatures (-100°C bis +310°C)
- Seals or integral piston seals with durable elastic seal lips
- Made of FDA (BGA/USDA) approved materials (PTFE or UHMW-PE) or made of especially wear-resistant PTFE-Compounds
The shown designs and types are only examples for the variety of possibilities, which can be realised with this variable modular system.
Send us your drawing/sketch, installation conditions and dimensions (groove dimensions, cylinder-diameter, rod-diameter, etc.), materials and hardness of the mating surfaces as well as the needed quantities.
We will submit an assembly proposal and an offer.
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A clean and economical solution for your sealing problem
The metering piston with a completely smooth surface, elastic seal lips, sterilisable, as a single one-piece element for metering, sealing and displacing, with an integrated bearing, maufactured of FDA approved polymer materials, provide your technical advance.
The smooth non-split surface and the elastic seal edges/scraper lips on the front and on the back of the piston prevent the products from settling in. PTFE materials with lowest friction coefficient and FDA-admission as well as especially wear-resistant compounds of physiological undaubtful admixtures provide a reliable tightness and a high wear life.
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Seal numbering system
Seal Numbering System and Part Number Examples
In general the following data suffice for seal definition and ordering:
1) Type | s. Standard-Radial and Standard-Axial Seals |
2) Nominal Diameter | Rod-, shaft-, cylinder-, bore-diameter or the groove and hardware dimensions |
3) Nominal Cross Section | 1/16’’, 3/32’’, 1/8’’, 3/16’’, 1/4’’, 3/8’’, 1/2’’, 3/4’’ or the groove and hardware dimensions |
4) Seal Jacket Material | s. Materials |
5) Spring Energizer Material | s. Materials |
Seal Numbering System/Part Number Examples
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Type | Nominal Diameter | Nominal Cross Section | Seal Jacket Material | Spring Energizer Material |
For special designs suffice the groove or hardware dimensions. For example:
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Type | Groove Dimension | Seal Jacket Material | Spring Energizer Material |
Information for installation
The installation in split grooves is the easiest way. Seals can usually be installed in partially closed grooves (with retainer) without any problems. Depending on diameters and cross sections, the type 103 seals can be installed in closed (nonsplit design) grooves. In such cases, we recommend contacting our Technical Service.
We will help you to work out the best solution for your assembly problem.
The mating surfaces should be smooth, free of burrs and sharp edges. Lead-in chamfers should be available for shafts and cylinders. When assembling over grooves and threads, a sleeve should be used to protect the seal. Light oiling or greasing makes the assembly easier.
All recommendations and data provided in this catalogue are based on the experience gained over decades of using such seals. Unknown factors and special conditions may restrict the generally valid promises. We are not able to guarantee every individual application. We suggest tests with samples. Our application engineers are always at your disposal for design and consultation. Don`t hesitate to use our experience.
For additional questions, please contact our Technical Service