Silicone vs EPDM

EPDM

EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber commonly used in automotive and constructive industries but has a disadvantage of having a lower heat resistance.

Silicone

Silicone is an inorganic polymer used in many industries and applications with the advantage that it can withstand extreme temperatures and keep its physical properties. Silicone is safe to use in the food and beverage industry.

How is Silicone Manufactured?

Depending on the type of silicone being used there are numerous ways to manufacture it. Silicone can come in three forms: LSR (Liquid Silicone Rubbers), RTV (Room Temperature Vulcanisation), HTV (High Temperatur Vulcanisation)

Technical Comparison

  • Temperature – EPDM has a max temperature of 130°C compared to silicone which can reach temperatures of 230°C and 270°C for high-temperature silicones.
  • Elongation – Silicone is seen as the stretchier rubber hence why it is used as vacuum membranes and has a tear resistance and elongation of up to 800% and can stay flexible up to -60°C.
  • Oil Resistance – both materials are prone to swelling
  • Environmental Resistance – Both EPDM and Silicone can withstand general weathering, Ozone, and UV
  • Tear Strength – EPDM is seen as the more durable rubber

Maximum Hot and Cold Temperatures for EPDM and Silicone

Hot Cold
+130°C EPDM starts to degrade -40°C EPDM reaches brittle point
+230°C Silicone starts to degrade -60°C Silicone reaches brittle point

Varying temperatures (hot or cold) have negative effects on all rubbers, particularly when heated.

silicone-heat-diagram

It is important to choose the right material

Silicone is superior when it comes to needing mechanical strength under intense heat and cold resistance as well as being flame resistant. It is important to look at all of the factors that these materials will be subjected to when looking to choose what rubber will be used.

To learn more about Silicone, click here.

To learn more about EPDM, click here.

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