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O-ring Selections

O-rings are an essential part to process equipment and ensuring replacements are an exact match and made of the correct material for the job is very important. Use the reference chart below to help identify o-ring replacements or to ensure the o-ring material is correct for your application.


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O-Ring Material

Identification

Temperature Limits

Recommended Uses

Nitrile (BUNA-N)

o-ring_nitrile_100x100

Compound Color:
BLACK OR GREY
Color Code:

YELLOW
FDA APPROVED
+250°F to -30°F
  • General purpose sealing
  • Petroleum oils
  • Cold water

EPDM

o-ring_epdm_100x100

Compound Color:
BLACK OR PURPLE
Color Code:
GREEN
FDA APPROVED
+250°F to -70°F
  • Steam to 400°F
  • Ketones (MEK, acetone)
  • Alcohols

SILICONE

o-ring_silicone_100x100

Compound Color:
ORANGE
Color Code:
BLACK
FDA APPROVED
+450°F to -65°F
  • Dry heat
  • High aniline point oils

FKM (Viton™)

o-ring_fkm_100x100

Compound Color:
STANDARD-RUST
Compound Color:
NON-STANDARD BLACK
Color Code: WHITE
FDA APPROVED
+400°F to -15°F
  • Petroleum oil
  • Acids

FFKM (Kalrez®)

o-ring_ffkm_100x100

Compound Color:
BLACK
Color Code:
NONE
+600°F to -10°F
  • High temps
  • Excellent chemical resistance

NEOPRENE

o-ring_neoprene_100x100

Compound Color:
BLACK
Color Code:
RED
+250°F to -45°F
  • Refrigerants (freon, ammonia)
  • Mild acids
  • Water

PTFE ENCAPSULATED,
TEFLON™ ENCAPSULATIONS

o-ring_ptfe_100x100

Compound Color:
TRANSLUCENT
Color Code:
ORANGE OR BLACK
+400°F to -15°F
  • Excellent chemical resistance
  • Static sealing applications