Materials and media stability

Below you find a short description on the used standard materials. In addition, Kofler-Dichtungen makes use of widely used standard materials. Therefore delivery of materials besides the mentioned below is possible. Please contact us.

 

Elastomers

Elastomers are materials which can be very strongly stretched by applying relatively little force, and which are not permanently deformed. Generally, elastomers can be divided into two main groups: chemically linked elastomers (rubbers) and thermoplastic elastomers.

Rubbers are high polymers whose macromolecules have been slightly cross linked by vulcanisation. Because of this network structure, they are not fusible and disintegrate at high temperatures. The network structure also has the effect that rubbers are insoluble and swell and shrink more or less depending on the medium.

Thermoplastic elastomers are materials which maintain the typical properties of elastomers throughout a wide range of temperatures. However, they are not chemically linked. Therefore, they can be melted at high temperatures and can be processed with the usual thermoplastic processing techniques. Thermoplastic elastomers are soluble and usually show a lower swelling than their chemically linked counterparts.

H - PU 94° Shore A

Hydrolysis resistant polyurethane: An exceptionally wear and extrusion resistant material, very elastic and with a good hydrolysis resistance. Hardness: 94° Shore A…

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H - PU 94° Shore A

Hydrolysis resistant polyurethane:

An exceptionally wear and extrusion resistant material, very elastic and with a good hydrolysis resistance.



Hardness: 94° Shore A +/- 1
Temperature range: -30°C to 115°C
Pressure resistance: Up to 400 bar



Resistance:

Mineral oils and fats (certain additives can have a destructive effect), hydraulic fluids on a mineral oil basis, silicone oils and fats, biologically degradable hydraulic fluids, aliphatic hydrocarbons (e. g. propane, butane, petrol), flame resistant hydraulic fluids of the HFA and HFB groups, seawater and hot water up to 90°C, diluted acids and lyes



Not resistant to:

Concentrated acids and bases, aromatic hydrocarbons ( e. g. benzene, toluene), ketones and glycols, brake fluids based on glycols, chlorinated hydrocarbons ( e. g. dichloromethane, trichloroethylene), superheated steam of over 100°C, amines, alkalis.
H - PU 55° Shore D

Hydrolysis resistant polyurethane: An exceptionally wear and extrusion resistant material, very elastic. Excellent hydrolysis resistance in the most common hydraulic fluids and…

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H - PU 55° Shore D

Hydrolysis resistant polyurethane:



An exceptionally wear and extrusion resistant material, very elastic. Excellent hydrolysis resistance in the most common hydraulic fluids and oil-in-water emulsions.



Hardness: 55° Shore D +/- 3
Temperature range: -30°C to +110°C
Pressure resistance: up to 400 bar
H - PU (FDA)

Hydrolysis resistant polyurethane with FDA certificate (common trade name: PU-FDA) Same mechanical properties as H-PU, but with an FDA certificate. Hardness: 94°…

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H - PU (FDA)

Hydrolysis resistant polyurethane with FDA certificate

(common trade name: PU-FDA)



Same mechanical properties as H-PU, but with an FDA certificate.



Hardness: 94° Shore A +/- 1
Temperature range: -30°C to 15°C
Pressure resistance: up to 400 bar
T - PU

Low temperature polyurethane This material is suitable for low temperatures. T-PU is resistant to all common mineral oils, hot air, and ozone.…

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T - PU

Low temperature polyurethane

This material is suitable for low temperatures. T-PU is resistant to all common mineral oils, hot air, and ozone.

Hardness: 96° Shore A +/- 2
Temperature range: -55°C to +110°C
Pressure resistance: up to 35 MPa
H - HPU

High-temperature polyurethane Extremely hardwearing and extrusion resistant sealing material, very elastic and with excellent hydrolysis resistance Hardness: 96° Shore A +/- 2…

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H - HPU

High-temperature polyurethane

Extremely hardwearing and extrusion resistant sealing material, very elastic and with excellent hydrolysis resistance

Hardness: 96° Shore A +/- 2
Temperature range: -35°C to 135°C
Pressure: up to 400 bar
PU - Mos²

Lubricant filled polyurethane Sliding material. Features high extrusion resistance and low friction. Very elastic. Particularly suitable for pneumatics. Excellent hydrolysis resistance in…

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PU - Mos²

Lubricant filled polyurethane

Sliding material. Features high extrusion resistance and low friction. Very elastic. Particularly suitable for pneumatics. Excellent hydrolysis resistance in oil-in-water emulsions.

Hardness: 96° Shore A +/- 2
Temperature range: -37°C to +110°C
Pressure resistance: up to 400 bar
NBR 85° Shore A

Acrylonitrile butadiene rubber Oil resistant material for standard applications. Hardness: at 20 °C: 85° Shore A +/- 5 Temperature range: -3°C to…

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NBR 85° Shore A

Acrylonitrile butadiene rubber

Oil resistant material for standard applications.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -3°C to +120°C
Pressure resistance: up to 160 bar

Resistance:
Flame resistant fluids HFA, HFB, HFC, with at least 40% water, water (special mixtures up to +100°C), aliphatic hydrocarbons such as propane, butane, petrol, mineral oils and fats, diesel fuels and heating oils, canola oils, polyalkylenglycols, many synthetic esters (environmentally friendly hydrocarbons), many diluted acids, bases, saline solutions, at low temperatures, silicon oils and silicone fats.

Not resistant to:
Ozone influence, weather and aging, brake fluids based on glycols (ATE blue, DOT 4, Pentosine), aromatic hydrocarbons such as benzene, chlorinated hydrocarbons such as trichloroethylene, flame resistant fluids HFD, polar solvents such as ketone, acetone, acetic acid ethylene ester.
NBR 90° Shore A

NBR 90° Shore has the same features as NBR 70° Shore, but it is harder and therefore more pressure resistant.

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NBR 90° Shore A

NBR 90° Shore has the same features as NBR 70° Shore, but it is harder and therefore more pressure resistant.
H - NBR

Hydrogenated acrylonitrile butadiene rubber Durability, heat and ozone resistance. Its mechanical properties are very good and it shows a good resistance against…

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H - NBR

Hydrogenated acrylonitrile butadiene rubber

Durability, heat and ozone resistance. Its mechanical properties are very good and it shows a good resistance against additized oils at high temperatures.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -20°C to +150°C
Pressure resistance: up to 160 bar

Resistance:
Crude oils containing hydrogen sulphide and amine, alloyed oils, cooling liquids and corrosion preventing substances.
H-NBR (FDA)

H-NBR with FDA certificate It has the same mechanical properties as H-NBR, but with an FDA certificate. Hardness: at 20 °C: 85°…

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H-NBR (FDA)

H-NBR with FDA certificate

It has the same mechanical properties as H-NBR, but with an FDA certificate.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -20°C to +150°C
Pressure resistance: up to 160 bar
T-NBR

Low temperature Nitrile Butadiene Rubber Copolymer, on a butadiene and acrylonitrile basis. Hardness: at 20 °C: 80° Shore A +/- 5 Temperature…

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T-NBR

Low temperature Nitrile Butadiene Rubber

Copolymer, on a butadiene and acrylonitrile basis.

Hardness: at 20 °C: 80° Shore A +/- 5
Temperature range: -50°C to 100°C
Pressure resistance: up to 160 bar

Resistance:
Against oils, fuels, crude oils

Not resistant to
Concentrated acids, concentrated lyes, polar solvents.
FPM (Viton)

Fluorine rubber Particularly temperature and chemical resistant material. Hardness: at 20 °C: 85° Shore A +/- 5 Temperature range: -20°C to +220°C…

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FPM (Viton)

Fluorine rubber

Particularly temperature and chemical resistant material.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -20°C to +220°C
Pressure resistance: up to 160 bar

Resistance:
Silicone oils and fats, synthetic aircraft engine oils, mineral oils and mineral fats, very good ozone, weather, and aging resistance, solvents such as perchloroethylene (PER) and trichloroethylene (TRI), acids and bases (at low temperatures).

Not resistant to:
Aromatic mineral oils
FPM (FDA)

Viton with FDA certificate It has the same mechanical properties as Viton FPM, but with an FDA certificate. Hardness: at 20 °C:…

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FPM (FDA)

Viton with FDA certificate
It has the same mechanical properties as Viton FPM, but with an FDA certificate.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -20°C to +220°C
Pressure resistance: up to 160 bar
EPDM

Ethylene propylene diene rubber Hardness: at 20 °C: 85° Shore A +/- 5 Temperature range: -45°C to max. +150°C Continuous service temperature:…

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EPDM

Ethylene propylene diene rubber

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -45°C to max. +150°C
Continuous service temperature: 130°C
Pressure resistance: up to 160 bar

Resistance:
Silicone oils and fats, ozone, aging, atmospheric exposure, brake fluids based on glycols up to +150°C, hot water and superheated steam, hydraulic liquids on a phosphor acid ester-basis (HFD-R).

Not resistant to:
Mineral oil products
EPDM (FDA+KTW)

EPDM with FDA certificate It has the same mechanical properties as EPDM, but with an FDA certificate. Hardness: at 20 °C: 85°…

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EPDM (FDA+KTW)

EPDM with FDA certificate

It has the same mechanical properties as EPDM, but with an FDA certificate.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -45°C to max. +150°C
Continuous service temperature: 130°C
Pressure resistance: up to 160 bar
MVQ (silicone)

Methyl vinyl silicone rubber This material is easy to install, exceptionally resistant to weather, ozone and aging, has good electric insulation characteristics,…

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MVQ (silicone)

Methyl vinyl silicone rubber

This material is easy to install, exceptionally resistant to weather, ozone and aging, has good electric insulation characteristics, and a very good resistance to hot air.

Hardness: at 20 °C: 85° Shore A +/- 5
Temperature range: -60°C to +220°C
Pressure resistance: up to 160 bar


Resistance:
Water up to approx. +100°C, brake fluids based on glycols, diluted hydrochloric acids, flame resistant hydraulic fluids (HFD- and HFD-S), high molecular chlorinated aromatic hydrocarbons, animal and vegetable oils and fats, ozone, aging, and weather, aliphatic motor and gear oils.

Not resistant to:
Silicone oils and silicone fats, fuels, water steam over +120°C, acids and alkalis, aromatic hydrocarbons, low molecular chlorinated hydrocarbons.
MVQ (FDA)

MVQ with FDA certificate Same mechanical properties as MVQ, but with an FDA certificate. Hardness: at 20 °C: 77° Shore A +/-…

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MVQ (FDA)

MVQ with FDA certificate

Same mechanical properties as MVQ, but with an FDA certificate.

Hardness: at 20 °C: 77° Shore A +/- 5
Temperature range: -60°C to +220°C
Pressure resistance: up to 160 bar
TFE / P Aflas®

Excellent resistance to chemicals and heat. Its elastic properties are similar to those of NBR elastomers. Hardness: 85° Shore A +/- 5…

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TFE / P Aflas®

Excellent resistance to chemicals and heat. Its elastic properties are similar to those of NBR elastomers.

Hardness: 85° Shore A +/- 5
Temperature range: -10°C to +200°C
Pressure resistance: up to 14 MPa

Resistance:
Acids, steam, hot water, amines, sols, oils, lubricants and acidic oils and gases. Good resistance against all kinds of hydraulic liquids (including Alkyl-Aryl-Phosphatestern [acryl aryl phosphor esters]) and against all brake fluids (on a glycol, mineral oil, or silicone basis), corrosion inhibitors on an amine basis, lubricant additives. Also resistant against ammoniac and bleaching agents / lyes.

Plastomers

Thermoplasts are fusible high polymer materials which are considerably harder and more rigid than elastomers within their application temperature range. Depending on their chemical structure their characteristics range from hard and brittle to tough and flexible. Because of their morphological structure larger stretchings are irreversible and the part remains plastically deformed, which is why these materials are also called plastomers.

In the seal industry, plastomers are used for hard seal elements such as back-up rings, guide rings and boxes, pressure rings and support rings

POM

Polyoxymethylene: Sliding material with a high pressure and extrusion resistance, very good machinability, and a very low water absorption rate. Hardness: In…

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POM

Polyoxymethylene: Sliding material with a high pressure and extrusion resistance, very good machinability, and a very low water absorption rate.




Hardness: In a dry condition: 85° Shore D +/- 3
Temperature range: -45°C to +100°C
Pressure resistance: n. a.



Resistance:

Water, alcohols, aliphatic and aromatic hydrocarbons, mineral oils and fats, fuels, weak acids and lyes, vegetable and animal fats and oils.



Not resistant to:
Strong acids and lyes
PA 6 G

Polyamide Sliding material with a high pressure and extrusion resistance is used for inner diameters of at least 250mm. Hardness: In a…

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PA 6 G

Polyamide

Sliding material with a high pressure and extrusion resistance is used for inner diameters of at least 250mm.

Hardness: In a dry condition: 85° Shore D +/- 3
Temperature range: -40°C to +110°C
Pressure resistance: n. a.

Resistance
Alcohols, aliphatic and aromatic hydrocarbons, mineral oils and fats, fuels, weak lyes, vegetable and animal fats and oils, esters, ketones.

Not resistant to:
Acids and strong lyes
PEEK

Polyetheretherketone This hard thermoplastic plastic is resistant to high temperatures. PEEK keeps its excellent characteristics up to a temperature of 260°C. Another…

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PEEK

Polyetheretherketone

This hard thermoplastic plastic is resistant to high temperatures. PEEK keeps its excellent characteristics up to a temperature of 260°C.
Another advantage is the extraordinarily high chemical resistance to almost all substances

Application:
Mainly for guide and support parts which have to satisfy highest demands.


Hardness: 86° Shore D
Temperature range: up to 260°C

Resistance to:
Mineral lubricants, aliphatic hydrocarbons, aromatic hydrocarbons, petrol, weak mineral acids, weak organic acids, weak lyes, strong lyes, acetone, alcohols, hot water.

Not resistant to:
Strong mineral acids, oxidizing acids.
PTFE pure

Polytetrafluoroethylene Excellent chemical resistance, special sliding properties, also applicable in the food sector. Hardness: 55° Shore D +/- 3 Temperature range: -200°C…

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PTFE pure

Polytetrafluoroethylene

Excellent chemical resistance, special sliding properties, also applicable in the food sector.

Hardness: 55° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: up to 160 bar

Resistance:
Hydraulic fluids, aggressive media such as alkalis, almost all acids and lyes, fire, atmospheric influences. No aging. Does not show any adhesive properties
PTFE MOS²

Polytetrafluoroethylene MOS² PTFE filled with 15% glass fibres and 5% MOS² (molybdenum disulfide). Especially for hydraulic applications, sharp-edged seals. Hardness: 58° Shore…

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PTFE MOS²

Polytetrafluoroethylene MOS²

PTFE filled with 15% glass fibres and 5% MOS² (molybdenum disulfide).

Especially for hydraulic applications, sharp-edged seals.

Hardness: 58° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: up to 400 bar
PTFE Bronze

Polytetrafluoroethylene bronze 40 % PTFE filled with 40% bronze and pigment. Standard material for floating ring seals. Hardness: 60° Shore D +/-…

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PTFE Bronze

Polytetrafluoroethylene bronze 40 %

PTFE filled with 40% bronze and pigment.

Standard material for floating ring seals.

Hardness: 60° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: up to 400 bar


Polytetrafluoroethylene bronze 46 %

PTFE filled with 46% bronze and pigment.

Its chemical resistance is similar to that of PTFE pure, but with a higher hardness and minimal gap extrusion.

Hardness: 71° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: n.a.
PTFE Coal

Polytetrafluoroethylene coal PTFE filled with 24% coal und 1% graphite. For improved dry running properties. Hardness: 60° Shore D +/- 3 Temperature…

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PTFE Coal

Polytetrafluoroethylene coal

PTFE filled with 24% coal und 1% graphite.

For improved dry running properties.

Hardness: 60° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: up to 160 bar
PTFE turquoise

Polytetrafluoroethylene pigmented turquoise PTFE filled with 1% pigment (and optionally 15% glass). Same chemical resistance as PTFE pure, but higher hardness. Hardness:…

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PTFE turquoise

Polytetrafluoroethylene pigmented turquoise

PTFE filled with 1% pigment (and optionally 15% glass).

Same chemical resistance as PTFE pure, but higher hardness.

Hardness: 57° Shore D +/- 3
Temperature range: -200°C to +260°C
Pressure resistance: n.a.