Silicone O-Rings

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 Dow Corning Corp.
• No trade name General Electric
• No trade name Stauffer Chemical Company

The silicones are a group of elastomeric materials made from silicone, oxygen, hydrogen and carbon. As a group, the silicones have poor tensile strength, tear resistance and abrasion resistance. Special compounds have beer made which have exceptional heat and compression set resistance. High strength compounds have also been developed but their strength does not compare to conventional rubber. Silicones possess excellent resistance to temperature extremes, Flexibility below - 175 degrees F (- 114 degrees C) has been demonstrated. The maximum temperature at which silicones are recommended for continuous service in dry air is 450 degrees F (232 degrees C). Silicone's retention of properties at these high temperatures is superior to other elastic materials, Silicone compounds are not normally recommended for dynamic sealing applications due to relatively low strength and high coefficient of friction. Many silicone compounds have a higher than normal mold shrinkage that results in finished parts being under mold shrinkage when produced in standard molds.

Silicones are recommended for:

• Dry heat,
• High-aniline point oils
• Chlorinated di-phenyls.

Silicones are not recommended for:

• Most petroleum fluids.
• Ketones (MEK, acetone).
• Water and steam.

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. To see a complete selection of the various sizes and types of O-Rings available from Scientific Instrument Services, just click on the hyperlink on the size list above. If the size you require is not listed, it may still be available. Contact us with your requirements.

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