Butyl O-Rings (Dash 390)

Butyl O-Rings (Dash 390)

Butyl is known for it's low permeability to air and gas, making it the best material for keeping oxygen or other gases from passing through the material. It is commonly used in vacuum applications where no oxygen can be present.

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  • ASTM 568 Dash Size: 390
  • Color: Black
  • Cross Section (in): 0.21
  • Cross Section (mm): 5.33
  • Durometer: 70A
  • Grade: Standard
  • Hardness: Standard
  • ID (in): 20.955
  • ID (mm): 532.26
  • Inch/Metric: Inch
  • Material: Butyl
  • Outter Diameter (In): 21.375
  • Outter Diameter (mm): 542.93
  • Profile: Round
  • Temp Range: -60 to 250 (F)
  • ZBIGBTL70390

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