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Dichta SADichta SA
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    ROTARY SHAFT SEALS

    RUBBER OD
    METAL OD
    C-O PTFE LIP SEALS
    RADIASEAL ®

    FRONTSEAL®

    O-RINGS

    VIBRATION DAMPERS

    BONDED SEALS

    MECHANICAL FACE SEALS

    HYDRAULIC & PNEUMATIC SEALS

    WIPER SEALS
    LIP SEALS
    PACKING SEALS (MEDIUM HIGH PRESSURE)
    PACKING SEALS (HIGH PRESSURE)
    GUIDE STRIPS
    ROD & PISTON SEALS
    DOUBLE-ACTING PISTON SEALS
    MUD PUMP PISTON SEALS
    CONCRETE PUMP PISTON SEALS

    POLYURETHANE SEALS

    PISTON SEALS
    WIPER SEALS
    ROD SEALS

    OTHER PRODUCTS

    END COVERS
    STAINLESS STEEL SPRINGS
    SPRING ENERGIZED PTFE SEAL
    THERMAL INSULATION SHEATHS
    HOLLOW SEALS FOR STATIC APPLIC.
    GREASE RINGS FOR AXLES
    DAM GATE SEALS
    INFLATABLE SEALS
    FLAT GASKETS
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HEADQUARTER (International Market)

DICHTA SA

Address:
Via Sottobisio, 28
6828 Balerna – Switzerland

T: +41 91 683 85 02
E: info.ch@dichta.com
VAT N° CHE-107.988.176

BRANCH (Italian market only)

DICHTA S.r.l.

Address:
Via Capuana, 24
20825 Barlassina (MB) – Italia

T: +39 0362 364 315 – 0362 364 307
E: info.it@dichta.com
VAT N° 09768370158

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Nitrile Rubber (NBR)

This elastomer is a copolymer of butadiene and acrylonitrile and is used for the majority of conventional fluid sealing application.

STANDARD COLOUR:

ADVANTAGES

  • good resistance to mineral oil and grease
  • good resistance to water and radiator fluid

LIMITATIONS

  • poor resistance to high-alloyed hypoid oil
  • poor resistance to ozone, weathering and sunlight
  • not resistant to automotive brake fluid (glycol based)
  • poor resistance to polar fluids (ketones, ethers, esters)
  • poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene)
  • poor resistance to aromatic solvents
Hydrogenated Nitrile Butadiene Rubber (HNBR)

STANDARD COLOUR:

ADVANTAGES

  • High resistance to oils and greases
  • Good resistance to mineral and hydraulic oils
  • Good resistance to acids and bases diluted
  • Excellent resistance to ageing, ozone and weathering

LIMITATIONS

  • Poor resistance to acids and bases concentrated
  • Poor resistance to aromatic and polar solvents
Elastomeric compounds (FFKM)

FFKM materials are elastomeric compounds designed with high fluorine content to offer extreme chemical resistance, similar to PTFE, and at the same time the elastic qualities of an elastomer.

ADVANTAGES

  • Excellent heat resistance
  • Excellent chemical resistance
  • Good mechanical properties
  • Low gas permeability
  • Excellent weather ability and ozone resistance
Polyethylene (UHMW-PE)

UHMW-PE polyethylene is a pressed technopolymer with very high molecular density. Compared to polyethylene with lower densities it has better mechanical characteristics, better resistance to wear and better smoothness having a lower coefficient of friction.

It is a very versatile plastic material and used in very many fields, offering durability to wear and good smoothness characteristics.

ADVANTAGES

  • Excellent resistance to very low operating temperatures
  • Good insulation properties
  • Excellent workability with low specific weight
  • Good smoothness
  • Physiologically harmless
  • Insoluble
  • Good impact resistance
  • Resistance to chemical agents
  • Suitable for contact with food
Polyamides (PA)

Polyamides are the most widely used thermoplastics and have the advantage of having excellent mechanical properties which remain constant even at high and low temperatures and a low coefficient of friction.

They have excellent wear and abrasion resistance and are also resistant to various chemical and atmospheric agents.

Being a hygroscopic material, i.e. it has a high humidity absorption, it is not suitable for applications involving contact with water or when demanding tolerances are to be maintained, especially in humid environments (for this reason PA is not used in contact with food).

ADVANTAGES

  • Good resistance to breaking, traction, compression and impact
  • Good resistance to aging and atmospheric agents
  • High mechanical strength even at high temperatures
  • Low coefficient of friction and abrasion
  • Excellent resistance to machine oils and greases
  • Zero resistance to concentrated acids
  • High humidity absorption (not suitable in the electrical sector)
  • High resistance to alkalis, inorganic compounds and solvents
Polyoxymethylene (POM)

Polyoxymethylene (POM, commonly known as Acetal Resin) is a semi-crystalline thermoplastic technopolymer popular for its excellent mechanical characteristics. It is used for the production of precision parts that require high rigidity, as an alternative solution to replace some metals such as steel, brass, aluminium. It has a low coefficient of friction and great dimensional stability, excellent sliding properties, resistance to wear and reduced moisture absorption.

ADVANTAGES

  • High strength & rigidity
  • Excellent creep resistance
  • Outstanding wear resistance
  • Good hydrolytic stability
  • Good resistance to stress cracking
  • Low friction
  • Very good machinability
PEEK

PEEK is a semi-crystalline thermoplastic known chemically as polyetheretherketone with excellent chemical resistance, very good mechanical characteristics, low permeability and with the best tensile strength coefficient of plastics. This material can be filled with glass fibre, carbon, PTFE, graphite and other components.

ADVANTAGES

  • Excellent dimensional stability
  • High mechanical strength, stiffness and hardness
  • Low flammability
  • Excellent ratio between stiffness, strength and resilience
  • Self-extinguishing
  • Very low flue gas density
  • Resistant to high and low temperatures
  • Excellent resistance to abrasion and wear
  • Low coefficient of linear expansion
Modified PTFE (MPTFE)

Modified PTFE (or MPTFE) is a further development of regular PTFE with a different chemical structure, reducing significantly its molecular weight. This compound presents a high quality and poreless character.

ADVANTAGES

  • Substantial reduction of deformation under load
  • Much higher elongations and breaking loads
  • Less permeability given by a denser structure of the polymer
  • Smoother surfaces
  • Improved stress recovery even at high temperatures
  • Higher transparency
Material - PTFE

Upon request we can supply the following material options:

  • Virgin PTFE
  • PTFE + Glass MoS2
  • PTFE + BaSo4 (barium sulphate – FDA)
  • PTFE + Ekonol (FDA)
  • PTFE + glass fiber (FDA)
  • PTFE + hollow glass microspheres (FDA)
  • PTFE + Carbographite
Material - PU

STANDARD COLOUR:

ADVANTAGES

  • FDA compliant
  • Excellent wear resistance
  • Excellent abrasion resistance
  • Excellent for dry applications
  • Low risk of deformation
  • Low coefficient of friction

LIMITATIONS

  • Poor chemical resistance
  • Poor dimensional stability in temperature
Material - FPM

It has good chemical resistance and is recommended for high temperature applications.

STANDARD COLOUR:

ADVANTAGES

  • excellent resistance to mineral oil and above all high-alloyed hypoid oils
  • excellent acid resistance
  • good resistance to aromatic and chlorinated hydrocarbons
  • excellent resistance to ageing, ozone and weathering

LIMITATIONS

  • limited cold flexibility
  • poor resistance to polar fluids (ketones, ethers, esters)
Material - MVQ

STANDARD COLOUR:

ADVANTAGES

  • retains flexibility down to very low temperatures
  • withstands continuous heating at high temperatures without hardening
  • resistant to mineral oil and greases
  • excellent resistance to ageing, weathering and ozone
  • good chemical resistance to alkalis

LIMITATIONS

  • not recommended for use with hydrocarbons such as petrols and paraffin, and lighter mineral oil or steam over 3.5 bar
  • not resistant to hot water, acids and non-mineral automotive brake fluids
  • poor wear resistance
Material - EPDM

STANDARD COLOUR:

ADVANTAGES

  • excellent resistance to ageing, weathering and ozone
  • good resistance to water and steam
  • good resistance to automotive brake fluid (glycol based)
  • good resistance to polar fluids

LIMITATIONS

  • poor resistance to mineral oil and grease
Material - ACM

STANDARD COLOUR:

ADVANTAGES

  • good resistance to oils and fuels
  • good resistance to ozone and weathering

LIMITATIONS

  • not resistant to water and water solutions
  • poor resistance to polar fluids (ketones, ethers, esters)
  • poor resistance to chlorinated hydrocarbons (carbon tetrachloride, trichloroethylene)
  • poor resistance to aromatic solvents
  • limited cold flexibility
  • poor wear resistance
Material - CR

STANDARD COLOUR:

ADVANTAGES

  • excellent resistance to ageing, weathering and ozone
  • moderate resistance to mineral oils and greases

LIMITATIONS

  • tends to harden or stiffen at low temperatures
  • not resistance to non-mineral automotive brake fluids