O-ring EPDM

EPDM

EPDM Rubber (ethylene-propylene-diene-monomer rubber)

What is EPDM?

Ethylene propylene rubber EPDM – is synthetic elastomer. International mark is EPDM. It has a good resistance to heating and pressing.

EPDM rubber – is the semi-product of stitched by peroxide ethylene-propylene-diene-monomer rubber. It contains grime and that is why it cannot be used for electrical insulation. EPDM usually has black color.

Main features EPDM

EPDM rubber has good mechanical qualities and wide temperature range appliance. Due the saturated structure, EPDM has very good resistance to ozone, atmospheric influences and detrition, but not to the mineral oils. Mineral oils and fats, and also plant and animal oils, provokes unacceptably strong swell. Special constructions of softeners allow also to apply EPDM with glycol-based break fluid (SL-DOT4).

It necessary to conform to the local norms of access and the presence of required permits if you want to use EPDM in such media. The resistance to the bombardment is relatively high.

The characteristics of EPDM rubber resistance regarding to the medium are listed below:

RESISTANT TO:
NOT RESISTANT TO:
  • hot water
  • water vapor
  • detergents
  • oxidizing medium
  • a lot of organica and nonorganic solutions and acids 
  • ketones
  • organic and nonorganic spirits 
  • flash-resistant hydraulic liquids of HSC, HSD types
  • glycol-based break fluids
  • freon R134a
  • detergents, hydrochloric and potassic alkalize 
  • salting liquids and oxidizing active medium
  • aliphatic hydrocarbons (propane, butane, benzene)
  • mineral oils and fats
  • aromatic and chlorine hydrocarbons 
  • plant and animal oils and fats
  • biologically degrading hydraulic fluids
  • flash-resistant phneumatic fluids of HFA, HFB and HFD-S groups
TEMPERATURE RANGE : -20°C to +120 °C

 EPDM appliance fields:

 

The main sphere of EPDM appliance, as the detail of mechanical seal: bellows, cross-section rings) – is pump equipment. Furthermore, EPDM is the most suitable material for applying in hot water or hot vapor (in installation must be greased by silicone fats).

 

Predominate appliance:
- special details for cleaning units;
- pluggable and piston packings;
- cross-section rings;
- seals for car breaking systems.

 

Chemical and physical properties of EPDM

 

Properties

Measure unit

Значение

Hardness

SHORE A

85±5

Density

g/cm3

1,22±0,02

Tensile strength

Н/mm2

≥12

Elongation

%

≥80

Deformation set 100oC/22h

%

≤10

Tensile strength to the wide breaks

Н/mm

10

Rapid return motion flexibility

%

38

Wearability

mm3

140

Minimal working temperature

°C

-20

Maximal working temperature

°C

+120