EPDM seals

EPDM is the abbreviation for ethylene-propylene-diene(monomer) rubber and belongs to the M-group of rubbers. Within the framework of the classification of rubbers, seals made of this sealing material are thus assigned to the non-polar saturated rubbers. The material is a high-quality, rubber-elastic, synthetic elastomer made of very long, saturated and highly stable molecular chains, the macromolecules ethylene, propylene and diene. Other trade names are, for example, BUNA-AP®, KELTAN® and NORDEL®. Due to the diverse properties and resistances of EPDM, the sealing material can be used in many areas of application.

EPDM gasket

Available EPDM materials at Rehm Dichtungen Ehlers GmbH

EPDM sealing material is available to us in various versions and different hardness ranges (approx. 25-80 Shore). We obtain a large part of it from the Austrian manufacturer Semperit. We are the second-largest dealer for Semperit. Semperit stands for the highest and most consistent product quality. Sustainability and good traceability of materials are also signs of the company. All EPDM qualities from Semperit are free of halogens and conflict materials. They are also REACH and RoHS compliant. In addition to Semperit qualities, the material is also available in import quality and CooperStandard. In the area of foamed materials in combination with EPDM components, we offer cellular rubber and sponge rubber.

Semperit: Standard qualities

E 4580

EPDM E 4580 is sulphur cross-linked, suitable for use in various automotive parts and complies with various automotive standards - such as VW2.8.1G50.

Technical data sheet:

E4580 EPDM 50 Shore

Properties:

Hardness [Shore A] ISO 7619-1 50 +-5
Density [g/cm³] ISO 1183 Approx. 1.05
Tensile strength [N/mm²] ISO 37-S2 8
Elongation at break [%] ISO 37-S2 500

 

Approvals and certifications:

  • Complies with various automotive standards (VW2.8.1 G50)
  • Corresponds to WDK guideline 2201
  • SVHC-free
E 9566

The sulphur-cured EPDM E9566 is our standard quality and also meets various automotive standards. The material is also characterised by a very good price-performance ratio.

Technical data sheet:

E9566 EPDM 70 Shore

Properties:

Hardness [Shore A] ISO 7619-1 70 +-5
Density [g/cm³] ISO 1183 Approx. 1.30
Tensile strength [N/mm²] ISO 37-S2 7
Elongation at break [%] ISO 37-S2 250

 

Approvals and certifications:

  • Complies with various automotive standards (VW2.8.1 G70)
  • Corresponds to WDK guideline 2201
  • SVHC-free
E 9614

EPDM E 9614 is a favourable peroxide nourished quality. It retains its physical values for a short time even at high temperatures up to +140 °C and is therefore used in the automotive industry.

Technical data sheet:

E9614 EPDM 70 Shore peroxide cross-linked

Properties:

Hardness [Shore A] ISO 7619-1 70 +-5
Density [g/cm³] ISO 1183 Approx. 1.22
Tensile strength [N/mm²] ISO 37-S2 9
Elongation at break [%] ISO 37-S2 200

 

Approvals and certifications:

  • slight decrease in physical values at high temperatures
  • Complies with various automotive standards (VW2.8.1 G70)
  • Corresponds to WDK guideline 2201
  • SVHC-free
E 9575

The EPDM E 9575 is sulphur cross-linked.

Technical data sheet:

E9575 EPDM 80 Shore

Properties:

Hardness [Shore A] ISO 7619-1 80 +-5
Density [g/cm³] ISO 1183 Approx. 1.30
Tensile strength [N/mm²] ISO 37-S2 5
Elongation at break [%] ISO 37-S2 200

 

Approvals and certifications:

  • Corresponds to WDK guideline 2201
  • SVHC-free

Semperit: Special qualities

E 628

The EPDM E628 is suitable for gaskets and equipment.

Technical data sheet:

E628 EPDM 70 Shore

Properties:

Hardness [Shore A] ISO 7619-1 70 +-5
Density [g/cm³] ISO 1183 Approx. 1.12
Tensile strength [N/mm²] ISO 37-S2 11
Elongation at break [%] ISO 37-S2 250

 

Approvals and certifications:

  • Certified according to elastomer guideline (ELL+W270) for cold and hot water
  • certified according to ACS
  • Corresponds to WDK guideline 2201
  • SVHC-free
E 2514

EPDM E2514 is the successor of E628, suitable for contact with drinking water and certified according to the ELL and W270 standards as well as the British WRAS.

Technical data sheet:

E2514 EPDM 70 ELL + W270

Properties:

Hardness [Shore A] ISO 7619-1 67 +-5
Density [g/cm³] ISO 1183 Approx. 1.09
Tensile strength [N/mm²] ISO 37-S2 9
Elongation at break [%] ISO 37-S2 200

 

Approvals and certifications:

  • Certified according to elastomer guideline (ELL+W270) for cold and hot water
  • certified according to WRAS
  • certified according to ACS
  • Complies with DIN EN 681-1
  • Corresponds to WDK guideline 2201
  • SVHC-free

Fire protection materials

E 2441

This EPDM E2441 has the fire protection classification according to DIN EN 45545 for material with a thickness of 2 to 10 millimetres.

Technical data sheet:

E2441 EPDM 60 Shore Fire Protection

Properties:

Hardness [Shore A] ISO 7619-1 60 +-5
Density [g/cm³] ISO 1183 Approx. 1.12
Tensile strength [N/mm²] ISO 37-S2 7
Elongation at break [%] ISO 37-S2 300
Abrasion [mm³] ISO 4649 350
Tear resistance [N/mm] ISO 34-1 6
Fire behaviour R22/HL2
R23/HL2
EN 45545-2

 

Approvals and certifications:

  • Fire protection classification for 2 to 10 mm thickness according to DIN EN 45545 Part 2: 2016-02 for requirement sets R22/R23
  • 2-5 mm: Type class HL2
  • 6-10mm: Type class HL3
  • Meets vehicle fire classification according to EU Directive 95/28/EC and US FMVSS 302
  • Corresponds to WDK guideline 2201
  • SVHC-free

Newly developed EPDM qualities

E 9568

This material corresponds to the sulphur-cured EPDM E9566, but is PAH-free. It therefore does not contain any polycyclic aromatic hydrocarbons of concern.

Technical data sheet:

E9568 EPDM 70 Shore PAH-free

Properties:

Hardness [Shore A] ISO 7619-1 70 +-5
Density [g/cm³] ISO 1183 Approx. 1.30
Tensile strength [N/mm²] ISO 37-S2 6
Elongation at break [%] ISO 37-S2 250

 

Approvals and certifications:

  • PAH free
  • Complies with various automotive standards (VW2.8.1 G70)
  • Corresponds to WDK guideline 2201
  • SVHC-free

Import qualities

EPDM/SBR 50 Shore

Technical data sheet:

EPDM/SBR 50 Shore

Properties:

Hardness [Shore A] 50 +-10
Density [g/cm³] Approx. 1.35
Tensile strength [N/mm²] 4
Elongation at break [%] 250
EPDM/SBR 65 Shore

Technical data sheet:

EPDM/SBR 65 Shore

Properties:

Hardness [Shore A] 65 +-10
Density [g/cm³] Approx. 1.4
Tensile strength [N/mm²] 4
Elongation at break [%] 250
EPDM/SBR 80 Shore

Technical data sheet:

EPDM/SBR 80 Shore

Properties:

Hardness [Shore A] 80 +-10
Density [g/cm³] Approx. 1.4
Tensile strength [N/mm²] 4
Elongation at break [%] 200
EPDM/SBR 65 Shore with insert

Technical data sheet:

EPDM/SBR 65 Shore with insert

Properties:

Hardness [Shore A] 65 +-10
Density [g/cm³] Approx. 1.4
Tensile strength [N/mm²] 4
Elongation at break [%] 250
EPDM/SBR light 65 Shore

Technical data sheet:

EPDM/SBR light 65 Shore

Properties:

Hardness [Shore A] 65 +-10
Density [g/cm³] Approx. 1.5
Tensile strength [N/mm²] 5
Elongation at break [%] 300

CooperStandard

A-KF 25-00 EPDM

This EPDM is sulphur cross-linked. It complies with DBL 557.10.

Technical data sheet:

A-KF 25-00 EPDM

Properties:

Hardness [Shore A] ISO 7619-1 / 3s 25 +- 5
Density [g/cm³] DIN EN ISO 1183 / ISO 2781 1,00 +- 0,02
Tensile strength [N/mm²] ISO 37 > 3,5
Elongation at break [%] ISO 37 > 400

 

Approvals and certifications:

  • Rebound resilience > 50%
  • Very high elongation
  • corresponds to DBL 5571.10
  • PAH free
A-KJ 50-00 EPDM

This EPDM is peroxide cross-linked and can be used up to 150 °C for short periods.

Technical data sheet:

A-KJ 50-00 EPDM

Properties:

Hardness [Shore A] ISO 7619-1 / 3s 50 +- 5
Density [g/cm³] DIN EN ISO 1183 / ISO 2781 1,05 +- 0,02
Tensile strength [N/mm²] ISO 37 > 12
Elongation at break [%] ISO 37 > 350

 

Approvals and certifications:

  • PAH free
  • corresponds to VW 2.8.1 G50
  • Makrolon and Plexiglas -resistant
  • Can be used for short periods up to 150 degrees Celsius

Other elastomers

EPDM 30 Shore

EPDM 30 Shore is very resistant to ozone, weathering, acids and basic alkalis

Technical data sheet:

EPDM 30 Shore

Properties:

Hardness [Shore A]   30 +-5
Density [g/cm³] ASTM D397 Approx. 1.06 +- 0.03
Tensile strength [N/mm²] ASTM D412 >10
Elongation at break [%] ASTM D412 600
EPDM 55 Shore Heat

Technical data sheet:

EPDM 55 Shore Heat

Properties:

Hardness [Shore A]   55 +-5
Density [g/cm³] ASTM D397 Approx. 1.15 +- 0.03
Tensile strength [N/mm²] ASTM D412 >5
Elongation at break [%] ASTM D412 250
EPDM 70 Shore

Technical data sheet:

EPDM 70 Shore

Properties:

Hardness [Shore A]   70 +-5
Density [g/cm³] UNE 53526 Approx. 1.23
Tensile strength [N/mm²] ISO 37 >9
Elongation at break [%] ISO 37 200

The properties of EPDM as a sealing material

Even though EPDM is available in different mixing ratios (mainly due to the ethylene and diene content), the material has a number of fundamentally identical properties. Based on the saturated main chain, the synthetic rubber is characterised by very good ageing resistance and high resistance to ozone, UV radiation, heat and oxygen. In addition, seals and gaskets made of EPDM are resistant to heat and weather. Furthermore, the material is resistant to hot steam, hot water and polar media, including diluted acids and alkalis, alcohols, ketones, salt solutions and silicone oils. Finally, the high electrical resistance should be mentioned in the area of properties.

EPDM is usually sulphur cross-linked, but also exists as a peroxide cross-linked material. Peroxide cross-linking achieves a significantly higher temperature resistance. A higher ethylene content improves low-temperature flexibility and elasticity. A higher proportion of diene ensures a higher cross-linking speed and density as well as strength.

A disadvantage of this material is its resistance to non-polar media, such as greases, mineral oils and fuels.

The advantages and material properties of EPDM at a glance

Seals and sheets made of this material are characterised by the following advantages:

  • Resistant to hot water and steam,
  • Good resistance to polar media
    • against alcohols and ketones,
    • as well as against organic and inorganic (weak) acids and bases.
  • fire-, heat- and weather-resistant,
  • resistant to UV light and ozone,
  • Good long-term behaviour or good ageing resistance
  • and good electrical insulation properties.

In summary, EPDM is resistant to various chemical, mechanical and thermal stresses. Thanks to the molecular structure and its compounds, seals made of this material are flexible.

EPDM resistances at a glance

Material designation Ozone and weather resistanceOil and petrol resistanceAcid resistanceStrong basesWear resistance
Semperit E2514Well resistantnot durableconstantconstantconditionally stable
Semperit E628Well resistantnot durableconstantconstantconditionally stable
Semperit E2441Well resistantnot durableconstantWell resistantconditionally stable
Semperit E9575Well resistantnot durableconstantWell resistantconditionally stable
Semperit E9614Well resistantnot durableconstantWell resistantconditionally stable
Semperit E9566Well resistantnot durableconstantWell resistantconditionally stable
Semperit E4580Well resistantnot durableconstantWell resistantconditionally stable
Semperit E9568Well resistantnot durableconstantWell resistantNot suitable
Cooper Standard
A-KF 25-00
Well resistantnot durableconstantconstantconditionally stable
Cooper Standard
A-KJ 50-00
Well resistantnot durableconstantconstantconditionally stable

The way to your EPDM flat gasket

The qualities presented and available at our company are first subjected to a quality control at goods receipt. Only then, after approval, is the sealing material stored in the form of rolls and sheets at the respective storage location. This enables us to guarantee a consistently high quality, also with regard to the respective sealing material.

EPDM belongs to the group of gasket materials that can be processed in all our manufacturing processes. The selection of the most suitable manufacturing process for your EPDM flat gaskets depends on the number of pieces, the respective contour and the thickness of the material. The unprocessed roll or sheet material is then processed into the individual EPDM flat gasket using the selected process. In addition, it is possible to apply a self-adhesive film to the roll or sheet material in advance and then process it into your self-adhesive EPDM gaskets using the manufacturing processes. Self-adhesive gaskets serve exclusively as an assembly aid without changing the properties of EPDM. In addition to the production of flange and flat gaskets, we also offer unprocessed rolls or sheets as well as cut-to-size yard goods made of EPDM for your own further processing. Here, too, we offer the option of applying self-adhesive finishes to the material.

After completion of the production and a renewed quality control, the seals are packed and shipped to you.

Application areas of EPDM gaskets

EPDM is used as a sealing material in many areas and industries. The elastomer is available in rolls and sheets. As a gasket manufacturer, we primarily cut these into flat gaskets, strips and blanks as required.

For example, seals made of this material are used in construction as pipe seals for drinking water and waste water.

EPDM is an excellent sealing material for various water-bearing building elements such as outdoor water pipes, seals in water taps or door seals. The black elastomer is also well suited as an underlay for green roofs, as it is root-resistant. In the automotive industry, EPDM seals and other components made of this material are increasingly being used in safety-relevant parts of car brakes. Another application we know of is the sealing of radiator, heating and ventilation hoses. In agriculture, too, seals made of EPDM are used in various agricultural machines such as combine harvesters or harvest scrapers due to their very good ageing resistance.

Other technical rubber products include the area around the topic of conveyor belts, which is also covered in depth under the item conveyor belts. Finally, we also stock EPDM materials with approvals for contact with drinking water and foodstuffs.

The material offers a wide range of applications as a sealing material, but should not come into direct contact with oils or lubricants.

We will be happy to answer whether the elastomer is also suitable for your purposes. Please contact our customer service, who will be happy to provide you with comprehensive advice.

FAQ

What are EPDM seals?
EPDM gaskets are gaskets made of EPDM material, which is a high-quality, rubber-elastic and synthetic elastomer. They belong to the M-group of rubbers.
What are the properties of EPDM gaskets?
EPDM is a resistant sealing material to various chemical, mechanical and thermal stresses.
What resistance do EPDM seals offer?
EPDM seals are highly resistant to ozone, UV radiation, acids and alkalis. EPDM is also resistant to heat and weathering. It is also resistant to hot steam, hot water and various alcohols.
Can EPDM gaskets also be equipped with self-adhesive?
EPDM gaskets can be equipped with basic self-adhesive features. For this purpose, the roll or sheet material is glued with a self-adhesive film in the first production step in order to produce your self-adhesive gaskets or flat gaskets in the second step.
Are EPDM seals temperature resistant?
EPDM seals are temperature resistant in a temperature range between -30 and +100 degrees Celsius.
Are EPDM seals oil resistant?
No, because the material is not resistant to non-polar media such as greases, mineral oils and fuels. When looking for oil-resistant sealing materials, NBR seals should be used.
Can EPDM also be purchased by the metre?
We use all our gasket materials to produce the right gaskets for you using our various manufacturing processes - water jet cutting, plotting, punching. However, we are also happy to sell you EPDM by the metre, in strips or in the form of rolls and sheets.
Where are the EPDM data sheets located?
You can find the data sheet for the respective quality under Service in the download area. Alternatively, you can fold out the desired material in the text above, as the technical data sheet for each quality is linked there.