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 +/- 1 Tempe...

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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 ...

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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 ...

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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 Tempe...

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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 ...

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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 res...

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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:...

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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

Hydrierter Acrylnitryl Butadien Kautschuk Alterungsbeständigkeit, Hitze- und Ozonbeständigkeit. Auch seine mechanischen Eigenschaften sind sehr gut und es weist gegen hoch add...

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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...

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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 ...

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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...

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FPM (FDA)

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...

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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 ...

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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. +...

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MVQ (SILIKON)

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...

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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 re...

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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 Pres...

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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 a dry condition: 85...

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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 Temperat...

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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...

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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...

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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° Sho...

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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 t...

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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 P...

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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° Sh...

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