Epdm ring temperature resistance relationship

Gasket Temperature Range | Flexible Material Temperature Chart

epdm ring temperature resistance relationship

This EPDM 70 durometer (70A) rubber specifications chart will help you RE EPDM compound has a temperature use range of °F to +°F. EPDM rubber a type of synthetic rubber, is an elastomer characterized by a wide range of EPDM exhibits outstanding resistance to heat, ozone, steam and weather. It is an electrical insulator. Typical properties of EPDM vulcanizates are . Family, Test Range, Reported CLTE (m/m/°C), Calculated CLTE (in/in/°F) These forces are generated by thermal expansion of the rubber and/or swelling.

Elastomers are selected according to the situation.

O Ring Properties High Temperature Resistance

At the low end, nearly all engineering materials become rigid and fail to seal; at the high end, the materials often burn or decompose. Chemical attack can degrade the material, start brittle cracks or cause it to swell. For example, NBR seals can crack when exposed to ozone gas at very low concentrations, unless protected. Swelling by contact with a low viscosity fluid causes an increase in dimensions, and also lowers the tensile strength of the rubber. Other failures can be caused by using the wrong size of ring for a specific recess, which may cause extrusion of the rubber.

Elastomers are sensitive to ionizing radiation. In typical applications, O-rings are well protected from less penetrating radiation such as ultraviolet and soft X-rays, but more penetrating radiation such as neutrons may cause rapid deterioration.

epdm ring temperature resistance relationship

In such environments, soft metal seals are used. There are a few common reasons for O-Ring Failure: Installation Damage — This is caused by improper installation of the O-ring.

EPDM 70, EPDM Rubber, EPDM Material, EPDM Properties - Mykin Inc

Spiral Failure — Found on long-stroke piston seals and — to a lesser degree — on rod seals. This twists the O-ring as the sealed device is cycled and finally causes a series of deep spiral cuts typically at a 45 degree angle on the surface of the seal.

Explosive Decompression - An O-ring embolism, also called gas expansion rupture, occurs when high pressure gas becomes trapped inside the elastomeric seal element.

This expansion causes blisters and ruptures on the surface of the seal. Space Shuttle Challenger disaster The failure of an O-ring seal was determined to be the cause of the Space Shuttle Challenger disaster on January 28, A crucial factor was cold weather prior to the launch.

This was famously demonstrated on television by Caltech physics professor Richard Feynmanwhen he placed a small O-ring into ice-cold water, and subsequently showed its loss of flexibility before an investigative committee.

epdm ring temperature resistance relationship

When an O-ring is cooled below its Tg glass transition temperatureit loses its elasticity and becomes brittle. More importantly, when an O-ring is cooled near, but not beyond, its Tg, the cold O-ring, once compressed, will take longer than normal to return to its original shape. Elongation Elongation is how stretchy a material is and how it performs when being expanded and contracted.

Oil resistance Although both materials are prone to swelling if exposed to oil for long periods, silicone has a better resistance to oil and is seen as a more suitable material to use out of the two. Environmental resistance If a rubber is to be applied in an application situated in an outdoor environment, the environmental resistance of the rubber needs to be assessed.

Temperature comparison Varying temperatures, whether hot or cold has negative effects on all rubbers.

epdm ring temperature resistance relationship

We have created a temperature resistance indicator for EPDM and Silicone, showing the limits of each rubber at certain temperatures. By moving the slide bar across you can see the temperature limits of each material.

Material Reference

Where the circles become smaller, this is the point where the rubber reaches its limits before being effected by temperature. Our Laboratory team performed a series of heat age tests on a standard piece of silicone sponge alongside a standard piece of EPDM sponge, both were 6mm thick.

It is available in sheet form, within a Kammprofile, as the filler in a spiral wound and within a ring type joint.

  • EPDM rubber
  • Ethylene propylene rubber
  • Gasket & Gasket Material Operating Temperature

Applications for the highest temperature rated and tested gasket materials are most often used within the following sectors: The main governing bodies and requested standards for related material are governed by: BSI Group — British Standard Institution -have since covered UK standards, initially within engineering the BSI group is now operating in countries and manages standards and certification to ensure standard quality and manufacture of parts and products across many sectors.

Formally JES since the law has been revised and now all Japanese products since October that are made by certified companies will bear the JIS mark. Providing safety-related certification, validation, testing, inspection, auditing and advising.

Gaskets have to comply with specifications when the complete unit has to undergo testing. Many European and American products for consumer sale will be required to conform to certain safety testing.

epdm ring temperature resistance relationship

In this instance the use of specific UL rated materials will be required. UL94 — The main flammability test for rubber materials is UL