LOW TEMPERATURE O-RINGS

Temperature accounts for an important factor while considering efficient sealing. Low temperature performance is one of the most overlooked properties in seal performance. Exposure to low temperature can contract elastomeric materials, resulting in decreased compression and possible leakage. When seal materials are exposed to lower temperature than their designed limit, seals become less flexible and brittle.

There are numerous applications that require elastomer sealing components to operate at low temperature. From sealing devices in well head and other drilling applications at high latitudes where the ambient temperature above and below ground is below 0°c for prolonged periods, low temperature o rings have been useful.

 

BEST CHOICES

NITRILE/ BUNA- N – O-Rings

 

Low Temperature O Ring

 

  • Temperature range

Temperature ranges from -40°C to 140°C

  • Features
  • It imparts elasticity and low temperature flexibility.
  • Nitrile has very good aging properties under severe conditions.
  • Nitrile compound has high tensile strength that outperform other elastomers.
  • It has an excellent abrasion, tear and compression set resistance.
  • It has poor resistance to ozone, sunlight and weathering as the double bond is present in the polybutadiene segment of the chemical back bone, hence seal from nitrile bases should not be stored near electric motors or ozone generating equipments.

 

ETHYLENE PROPYLENE/EPDM - O-Rings

 


epdm-nbr-hnbr-nitrile-o-ring-250x250

 

  • Temperature range

Temperature ranges from -51°C to 149°C

  • Features
  • EPDM compounds are used frequently to seal in brake systems, and for sealing hot water and steam.
  • EPDM compounds have good resistance to mild acids, detergents, alkalis, silicone oils and greases, ketones, and alcohols.
  • They are not recommended for applications with petroleum oils, mineral oil, di-ester lubricants, or fuel exposure.
  • EPDM has excellent ozone and chemical resistance properties and is compatible with many polar fluids.

 

NEOPRENE - O-Rings

Neoprene O-Ring

  • Temperature range

Temperature ranges -40°C to 121°C

  • Features
  • Neoprene O-Rings are good quality and reasonably priced, as they have a good wear and permeation resistance.
  • They are usually used in refrigerators, dilute acids, and some petroleum oils. They should be avoided in auto and aircraft brake fluids, gasoline and ketones.
  • It has great resistance to petroleum oils, oxygen aging, ozone and sunlight, relatively low compression set and outstanding physical toughness.
  • Neoprene  has excellent adhesion qualities to metals for rubber to metal bonding applications. It is used extensively for sealing refrigeration fluids due to its excellence resistance to Freon® and ammonia.

 

POLY URETHANE - O-Rings

 

Poly Urethane O Rings Poly urethene

  • Temperature range

Temperature ranges -30°C to 10o°C

  • Features
  • It is an excellent elastomer with high abrasion resistance characteristics and high mechanical strength.
  • It is especially suited wherever o rings are subjected to dynamic loads.

 

ISOPRENE/NATURAL RUBBER - O-Rings

 

Isoprene O Rings

  • Temperature

Temperature ranges -54°C to 72°C

  • Features
  • Natural rubber has high resilience, high strength with good abrasion resistance.
  • Excellent resilience and compression set
  • Excellent electrical resistivity
  • Excellent adhesion to fabric and metals
  • Excellent resistance to water and dilute acids and alkalis
  • Good flexibility at low temperatures
  • Good resistance to abrasion, gouging and cut growth
  • However, limited resistance to heat and weathering has reduced the use of natural rubber in favour of synthetic elastomers.

These low temperature O-Rings prevents hardening of the seal which in turn prevents a compression set and leakage.