Gaskets, sealing elements for hydraulics and pneumatics

We offer a complete range of industrial sealing elements, which are mainly used in the hydraulic and pneumatic field.
In addition to standardized elements, we also offer CNC custom manufacturing, where production is possible from 1 piece up to a diameter of 500 mm.

Seals used in hydraulics and pneumatics that are manufactured in standardized size ranges and materials.
The advantage is the lower price due to the large-scale production. The disadvantage is often a lower availability of pieces and also a limited area of use.
We source from leading European manufacturers and keep the most commonly used types and sizes in stock.

  • we offer a complete range of mass-produced sealing elements in standardized sizes

  • wiper rings, piston rings, piston seals, guide rings, static, rotary, pneumatic elements, bearings and more

  • we keep a large number of standard parts in stock for immediate collection

  • production according to UNI EN ISO 9001:2015 and IATF 16949, production process control according to DIN ISO 2859-1 AQL 1,5

  • we offer quantity discounts, customized warehouse and other benefits

In practice, there are cases when a standardized solution cannot be used for various reasons.
For these situations, we offer the option of CNC production. Production is possible from 1 piece without the need for mould costs etc.
We keep enough starting materials in stock to be able to deal with urgent cases and requirements.

  • production on our own CNC machine up to a diameter of 500 mm (larger diameters are solved in cooperation)

  • production of all hydraulic, pneumatic seals including atypical profiles and shapes

  • design of custom technical and material solutions according to application requirements

  • flexible and short delivery times thanks to our extensive stock of semi-finished products

  • production from rubbers, polyurethanes, PTFE (including filled variants) and plastics – more than 65 material variants on offer

Other hydraulic sealing services

Other services in the field of sealing elements for industrial applications are also an integral part of our offer

Dimensioning of building spaces and design of tailor-made solutions

  • We will measure the necessary installation dimensions for the correct choice of seals and design the most suitable solution based on the operational requirements.
    If it is not possible to use a standardized type, we will design and subsequently manufacture a custom element from a suitably selected material.
  • We carry out the measurement of buildings in our plant, but also directly at the customer’s plant

  • Recommendations for the design of sealing grooves and other functional surfaces

Installation of hydraulic and other seals

  • Installation and fitting of hydraulic sealing elements into the equipment
  • Recommendations for installation

  • Assistance in the installation of atypical solutions directly at the customer’s site
  • Mounting kits, gauges and other accessories

Complete overhaul of hydraulic cylinders

  • We perform complete overhauls of hydraulic cylinders and other hydraulic equipment
  • In addition to the fitting or custom manufacturing of a new seal, we also (if the equipment is heavily worn) machine the metal parts of the equipment to ensure full functionality and service life.
  • We offer complete metalworking services, locksmithing, weldment fabrication and other related operations

Sealing elements for other industrial applications

  • Design and manufacture of sealing elements for other industrial applications
  • Sealing elements for water works
  • Sealing sleeves for flap and ball valves
  • Sealing of flanges, lids, caps, expansion joints and other elements

  • Atypical applications and custom solutions

Basic overview of the types of sealing elements offered:

Hydraulically cylinder
Piston seal

This is usually the main active sealing element. It transfers the pressure caused by the used media to the sliding motion of the piston rod and other downstream parts of the machine. It is mounted on the piston and seals the movement on the outer edge, in the cylinder.

Piston rod seal

The seal that closes the cylinder. Its purpose is to prevent leakage of the medium from the device into the open space or into another part of the device. Primarily designed for sliding movements or in combination with slight rotation. It is located in the cylinder head and seals the movement of the piston rod on the inner blade.

Wiper rings

A sealing element whose primary function is to wipe dirt from the piston rod. It protects the equipment from dirt ingress and thus significantly increases the life of the other seals used and the machine itself.

Guide rings

Their purpose is to define the clearance between the piston and cylinder or piston rod and head. They increase the mechanical resistance of the seals, prevent abrasion of the seals and reduce friction in the equipment.

Support rings

Support rings (usually made of plastic) act as reinforcement rings that increase the pressure and mechanical resistance of O-rings and other seals. They also prevent the seal from entering the joint at larger clearances in the device.

Static seals

Static sealing elements designed to seal non-moving parts. They are primarily used for sealing flanges and cylinder heads.

Rotary sealing elements

Sealing elements designed for rotary motion. These are mainly various motors, rotary converters, distributors, joints and similar devices.

Hydraulic seals – materials used for production

We use a wide range of materials for production. These are mainly H-PU, NBR, FPM, EPDM, POM, PTFE and others.

Below you will find an overview and basic properties of a few selected materials. However, we offer more than 65 material variants.
The material is selected according to the requirements of the application, taking into account the operating temperature, pressure, chemical environment and other parameters.
We also offer materials with FDA approvals and certifications that can be used in e.g. in the food or pharmaceutical industry.

Detailed technical data sheets for all materials are available on request.

MateriálTvrdostTeplotaPopis a použití
H-PUPolyuretan HPU, FDA
červený
95 ± 2 °Sh.A-20 ÷ 115 °CUniverzální materiál, který vyniká svými mechanickými vlastnostmi, odolností vůči opotřebení, teplotám a výbornou obrobitelností.
Ve vodě odolný hydrolýze. Vhodný pro minerální oleje a tlakový vzduch.
H-PU žlutéPolyuretan HPU 55D
žlutý
55 ± 3 °Sh.D-20 ÷ 115 °CUniverzální materiál, který vyniká svými mechanickými vlastnostmi,
zvýšenou odolností vůči opotřebení, teplotám a výbornou obrobitelností.
Ve vodě odolný hydrolýze. Vhodný pro minerální oleje a tlakový vzduch.
NBRPolyuretan SL-PU
černý
96 ± 2 °Sh.A-20 ÷ 110 °CMazivy plněný polyuretan s výbornými mechanickými vlastnostmi a odolností vůči opotřebení. Díky obsahu maziva je zvláště vhodný pro aplikace s omezením mazáním (např. suché pneumatické použití)
NBRPryž NBR 85
černá
85 ± 5 °Sh.A-30 ÷ 110 °CPryž odolná minerálním olejům, palivům, rostlinným a živočisným tukům, HFA, HFB a HFC-kapalinám. Disponuje výbornými elastickými vlastnostmi. Není dlouhodě odolná povětrnostním vlivům a ozonu.
FDAPryž NBR 85 FDA
bílá
85 ± 5 °Sh.A-30 ÷ 110 °CPryž NBR bílé barvy s atestem FDA pro použití např. v potravinářství.
Odolná minerálním olejům, palivům, rostlinným a živočisným tukům, HFA, HFB a HFC-kapalinám. Výborné elastické vlastnosti.
HNBRPryž H-NBR 85
zelená
85 ± 5 °Sh.A-20 ÷ 150 °CPryž NBR se zvýšenou odolností vysokým teplotám a navýšenou otěruvzdorností. Odolná minerálním olejům, palivům, rostlinným a živočisným tukům, HFA, HFB a HFC-kapalinám. Výborné elastické vlastnosti.
NBRPryž EPDM 85
černá
85 ± 5 °Sh.A-45 ÷ 130 °CPryžový materiál s výbornou odolností záporným teplotám, stárnutí a povětrnostním vlivům. Odolný alkoholům, alkáliím, kyselinám a dalším látkám. Nevhodný pro ropné produkty, tuky a oleje.
FDAPryž EPDM 82 FDA
bílá
82 ± 5 °Sh.A-45 ÷ 130 °CPryž EPDM bílé barvy s atestem FDA pro použití např. v potravinářství. Materiál s výbornou odolností záporným teplotám, stárnutí a povětrnostním vlivům. Odolný alkoholům, alkáliím, kyselinám a dalším látkám.
FPMPryž FPM
hnědá
82 ± 5 °Sh.A-20 ÷ 220 °CMateriál s velmi vysokou teplotní odolností a výbornou chemickou odolností i proti agresivním chemikáliím. Nevhodná pro použití u horké vody.
VMQPryž Silikon
modrá
85 ± 5 °Sh.A-60 ÷ 200 °CPryžový materiál s výbornou teplotní odolností, vysokou flexibilitou i při nízkých teplotách a odolností vůči atmosferickým vlivům a stárnutí. Nulový vliv na chuť i vůni média - často využíván v potravinářství.
FDAPryž Silikon FDA
bílá
85 ± 5 °Sh.A-60 ÷ 200 °CSilikonová pryž v bílé barvě s atestem FDA. Pryžový materiál s výbornou teplotní odolností, vysokou flexibilitou i při nízkých teplotách a odolností vůči atmosferickým vlivům a stárnutí. Nulový vliv na chuť i vůni média.
FDAPTFE virgin
bílá
55 ± 3 °Sh.D-200 ÷ 260 °CMateriál s výjimečnou chemickou a teplotní odolností a výbornými kluznými vlastnostmi. Má atest FDA a lze tak použít v potravinářství. Nejčastěji je využíván pro vodící a opěrné kroužky.
PTFE + 40% bronz
hnědá
60 ± 3 °Sh.D-200 ÷ 260 °CPTFE plněný ze 40% bronzem. Díky této přímesi je dosaženo zvýšené pevnosti tlaku, tepelné vodivosti a vyšší odolnosti extruzi. Jde o nejčastěji používanou PTFE směs pro výrobu hydraulického těsnění.
PTFE + uhlikPTFE + 25% uhlík
šedá
65 ± 3 °Sh.D-200 ÷ 260 °CPTFE plněný z 25% uhlíkem. Příměs uhlíku zvyšuje tvrdost, odolnost proti tečení, otěruvzdornost a tepelnou vodivost materiálu.
Částečně samomazný.
PTFE PEEK
béžová
60 ± 3 °Sh.D-200 ÷ 260 °CPTFE plněný z 10% PEEK. Výborná odolnost otěru a extruzi, zvláště v aplikacích s minimem maziva. Materiál má FDA atest.
FDAPOM
bílá
81 ± 3 °Sh.D-45 ÷ 100 °CMateriál s výbornými mechanickými vlastnostmi, vysokou tvrdostí, tvarovou stálostí a velkou odolností otěru.
Využíván především pro výrobu opěrných a vodících kroužků.
FDAPA
bílá
79 ± 3 °Sh.D-40 ÷ 110 °CPolyamid PA vyniká mechanickými vlastnostmi, otěruvzdorností a kluznými vlastnostmi. Nevýhodou je poměrně vysoká nasákavost vodou.
FDAPE-UHMW
bílá
61 ± 3 °Sh.D-200 ÷ 80 °CVysokomolekulární polyetylen je materiál s vysokou odolností otěru, opotřebení a dobrými kluznými vlastnostmi. Výborná odolnost záporným teplotám.
Examples of finished products and production process

For more information on hydraulic seals, see for example this resource.

We keep sufficient quantities of long term items in stock and are thus able to respond flexibly and very quickly to current requirements or urgent delivery needs. We also maintain an extensive stock of raw blanks and materials used in production. Thanks to this, we are able to solve even urgent cases efficiently and we are able to carry out production within hours.

In the case of long-term cooperation, we offer our customers not only quantity discounts but also other preferential business conditions.

Seal design and mechanics – basic information

When designing a solution, several factors must be taken into account to determine the ideal choice of profile and material.

These are mainly pressure, temperature, speed, chemical environment, friction, method of treatment of functional surfaces and other factors.
Based on these factors, we select the sealing element that ideally meets the requirements of the application and guarantees a high sealing effect and durability.

Surface quality requirements for functional areas

Particular attention should be paid to the surface design of the functional surfaces.
The purpose is to ensure a surface quality that minimizes abrasion and wear on the seal.

The piston rod seal, which seals against the moving surface, can be damaged by fine abrasive particles which may adhere to the rough surface. Therefore, the bars should have a low surface roughness value, and the surface should be similar to hard chrome and rust-proof. The ideal surface roughness is somewhere around 0.3 µm (Ra) or 2.3 µm (Rt).

The piston seal, which seals against the inner surface of the cylinder, is not exposed to the same range of abrasive particles entering from the atmosphere and can therefore handle rougher surfaces. The ideal surface roughness is somewhere around 0.5 µm (Ra) or 3.7 µm (Rt). The operating pressure must be taken into account when assessing the surface properties. At higher operating pressures, the film between the seal and the sealing surface is thinner and friction is greater. Under such operating conditions, the least possible surface roughness should be selected.
The surface quality for static sealing should be around 1 µm (Ra) or 7 µm (Rt).

Detailed information on construction, design and other technical information can be found in our catalogue.

Offering a related range and combination of technologies

In addition to the manufacture and sale of sealing elements for hydraulic and pneumatic applications, we also offer other products and services.
These are mainly flat seals, rubbers, rubber profiles, mechanical seals, sealing cords and other products.
Thanks to this, we can provide effective solutions even for complex assemblies where the sealing of the equipment must be solved by combining different elements and using different production technologies.

For general information on the function of the hydraulic cylinder and how to solve its sealing, see for example this link or this video.