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O-Rings

Material for O-Rings

O ring Seals O-Ring Types Available

O-Rings are available in five different polymer materials as well as Gold and Platinum from Scientific Instrument Services. For a complete description of each of the types, select the type of material listed above.

O-Ring Dimension and Availability Charts

O-Rings are available in sizes (sizes 0, 1, 2 and 3) which correspond to the diameter of the cross section of the O-Ring. Within these groups the O-Rings are classified according to their inside diameter. In addition O-Ring Kits of the most popular sizes of O-Rings are available in both Buna and Viton®. If the size you require is not listed, it may still be available. Contact us with your requirements.

Industry

Sizes

Cross Section

Diameter (in.)

Minimum Inside

Diameter (in.)

Maximum Inside

Diameter (in.)

Size - 0 0.04 to 0.07 0.031 5.25
Size - 1 1/16 (0.063) 0.0625 9.75
Size - 2 1/8 (0.125) 0.1875 18
Size - 3 3/16 (0.188) 0.4375 11.5

Comparision of O Materials Used in the Construction of O-Rings

Each type has its advantages and disadvantages as listed in the chart below, and the type required depends on the O-Ring application. Of the various types of O-Rings available from SIS, Viton® is the most popular for mass spectrometers and other laboratory instruments. This is due to Viton®'s high temperature stability and good resistance to chemicals and ozone. Gold gaskets are used to make high vacuum and high temperature seals on vacuum flanges.

Property Buna-N Viton® Silicone PTFE Kalrez®
Part No. Prefix B- V- S- T- K-
Tear Resistance Good Good Poor Excellent Good
Abrasive Resistance Good Good Poor Excellent Good
Ozone Resistance Poor Excellent Excellent Good Excellent
Weather Resistance Fair Excellent Excellent Good Excellent
Heat Resistance Fair Excellent Excellent Good Excellent
Chemical Resistance Fair Excellent Good Excellent Excellent
Oil Resistance Poor Excellent Poor Good Excellent
Acid Resistance Fair Excellent Good Excellent Excellent
Alkali Resistance Good Good Fair Excellent Excellent
Steam Resistance Fair Fair Poor Good Excellent
Minimum Usable Temp -65 deg F

-54 deg C

-65 deg F

-54 deg C

-120 deg F

-85 Deg C

-110 deg F

-79 deg C

-35 deg F

-37 deg C

Maximum Usable Temp 300 deg F

150 deg C

500 deg F

260 deg C

450 deg F

232 deg C

500 deg F

260 deg C

550 deg F

288 deg C

Color Black Black Red White Black
Impermeability Fair Good Poor Excellent Good
Tensile Strength Good Good Poor Excellent Good

Kalrez® and Viton® are registered trademarks of E. I. DuPont de Nemours
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Subcategories
  • Viton® and Kalrez®Viton® and Kalrez® (2)
    Viton® and Kalrez® Composition O-Rings Viton - Size 0 Viton - Size 1 Viton - Size 2 Viton - Size 3 Viton - Metric Sizes Kalrez - Size 0 Kalrez - Size 1 Kalrez - Size 2 Kalrez - Size 3 For background information, see O-Rings. O-Rings are available in five different materials from Scientific Instrument Services. Each type has its advantages and disadvantages as listed in the O Ring Comparison Chart. Of the various types of O-Rings available from SIS, Viton® is the most popular for mass
    Individual Metric Viton® O-Rings
  • Buna-NBuna-N
    Buna-N O-Rings Size 0 Size 1 Size 2 Size 3 For background information, see O-Rings. O-Rings are available in five different materials from Scientific Instrument Services. Each type has its advantages and disadvantages as listed in the O Ring Comparison Chart. Of the various types of O-Rings available from SIS, Buna-N is the most sidely used type of O ring in the seal ring. It is also the least expensive type of O-Ring seal. It does however have severe temperature and chemical resistance limitati
  • SiliconeSilicone
    Silicone O-Rings Size 0 Size 1 Size 2 Size 3 For background information, see O-Rings. O-Rings are available in five different materials from Scientific Instrument Services. Each type has its advantages and disadvantages as listed in the O Ring Comparison Chart. Silicone is a popular O Ring which is commonly red in color. they are popular for use in scentific instruments such as GC injection ports which use high temperatures. SILICONE RUBBER (Si) Typical Trade Names: Rhodia Rhone Poulenc Silastic
  • PTFEPTFE
    PTFE O-Rings Size 0 Size 1 Size 2 Size 3 For background information, see O-Rings. O-Rings are available in five different materials from Scientific Instrument Services. Each type has its advantages and disadvantages as listed in the O Ring Comparison Chart. PTFE is a popular O Ring which is white in color. The PTFE O-Rings are popular for use in applications which require a chemically resistant and non-compressible material. PTFE is the chemically inert of the O-ring materials. It is resistant t
  • Gold, Platinum, Silver/TinGold, Platinum, Silver/Tin
    Gold - Platinum - Silver/Tin * O-Rings Navigate Back to O-Rings Custom O-Rings available from Scientific Instrument Services (Contact Us). Presision Manufactured O-Rings Gold (99.99% pure) Platinum (99.99% Pure) Silver/Tin (96% Tin/4% silver) Other Alloys Applications: High Temperature Seals Vacuum Gaskets and Seals Precision Valves Gold and Platinum Wire Ring O-Ring Gaskets Pure Gold (99.99%) and Pure Platinum (99.99%) wire ring vacuum gaskets can be constructed from four diameters of wire; ie.
  • Metric O-RingsMetric O-Rings
    Individual Metric Viton® O-Rings Other Metric O-Ring Kits Navigate Back to Viton® O-Rings Back to O-Rings These individual metric O-Rings are available as listed below. Hardness range is 70 to 80 Shore A durometer. Other sizes available on request. All dimensions in mm. Available in packages of 10 only. A Metric O Ring Kit which contains 500 O-Rings or 36 different sizes is also available. For other sizes hyperlink to the apprptriate O-ring size pages listed below. For ordering informati
  • O-Ring KitsO-Ring Kits (3)
    O-Ring Kits More types Metric O-Ring Kits Diffusion Pump O-Ring Kit Navigate Back to O-Rings 30 Different Sizes 380 O-Rings Total Ready to Use Suitable From -40 deg. to +300 deg. F All Popular Sizes Labeled Storage Posts Available in Viton®, Buna-N, PTFE or Silicone 30 Sizes of O-Rings in a handy storage case This convenient O-Ring kit contains 30 of the most popular sizes, for a total of 380 O-Rings, in one convenient kit. It is ready to use and will give you easy access and storage to what
    Metric O-Rings Kits
    Diffusion Pump O-Ring Kits
  • Gold Foil and Gasket MaterialGold Foil and Gasket Material
    Gold and Silver/Tin Wire/Foil for Gasket Fabrication Gold Wire for Gasket Fabrication Pure gold wire (24K, 99.99% pure) for use in gold gasket fabrication, sputter coasters or other scientific applications. W351 : Gold Wire (24K, 99.99% pure), Diameter (in)=0.020, Diameter (mm)=0.50, (ohms/cm)=0.00120,W352 : Gold Wire (24K, 99.99% pure), Diameter (in)=0.025, Diameter (mm)=0.64, (ohms/cm)=0.00073,W353 : Gold Wire (24K, 99.99% pure), Diameter (in)=0.031, Diameter (mm)=0.79, (ohms/cm)=0.00048,W354
  • Viton, PTFE and Silicone Sheet MaterialViton, PTFE and Silicone Sheet Material
    Viton®, PTFE, and Silicone Sheets Navigate Back to O-Rings Viton®, PTFE, and red Silicone sheets are now available in 12"x 12" sheets in the thicknesses listed below. These sheets are particularly well suited for cutting your own gaskets and seals. Other materials and thicknesses are available on special request. VS0 : Sheet, 1/16in Viton(R),VS1 : Sheet, 1/8 in Viton(R),VS2 : Sheet, 1/4 in Viton(R),TS0 : Sheet, 1/32 in PTFE,TS1 : Sheet, 1/16in PTFE,TS2 : Sheet, 1/8 in PTFE,TS3
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