Silicone O-Rings & Silicone Compound Properties

Silicone O-Rings
Silicone O-Rings

Silicone o-rings are excellent seal materials for high temperatures in static environments. Typically, silicone o-rings show outstanding flex and fatigue life, strong ozone and UV radiation resistance, and physiologically neutral and insulating properties. Silicone o-rings can be synthesized with a wide variety of properties and compositions, allowing for great flexibility in performance.

Recommended Use Not Recommended For Mechanical Properties
Dry Heat
Wide Temperature Range
Sunlight, Ozone,  Weathering
Odorless and Non-Toxic
Ketones (MEK)
Acids
Silicone Oils
Brake Fluids
Poor Wear Resistance
Excellent Comp. Set Resistance
Poor Short-Term Resilience
Excellent Permeation Resistance
Marco CPD# Datasheet Color Duro (Shore A) Relative Price Typical Inventory Level High Temp (F) Low Temp (F) Features
Orange 70 O-ring Price Comparison 3 Very High 400 -75 General purpose and FDA compliant Silicone per 21 CFR 177.2600   (available in nearly any color and durometer)
Orange 40 O-ring Price Comparison 4 Low 400 -75 General purpose softer than standard Silicone to seal rough or warped glands and or low closure force applications
Orange 70 O-ring Price Comparison 4 Low 500 -65 Higher temperature resistant Silicone
Orange 50 $$$$ Low 400 -103 Lower temperature resistant Silicone
Clear 70 $$$$ Low 400 -65 Clear-Translucent and FDA compliant Silicone per 21 CFR 177.2600
White 70 O-ring Price Comparison 4 Low 480 -75 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
Clear 70 O-ring Price Comparison 4 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
Clear 70 O-ring Price Comparison 5 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Clean Room Manufactured
Orange 65 $$$$ Low 350 -65 EMI RFI Shielding Nickel Coated Graphite filled Silicone, Volume Resistivity 0.10 ohm-cm

Marco Rubber has millions of standard and non-standard silicone o-ring sizes in-stock, and the ability to custom-make o-rings upon request, often without tooling fees. Order silicone o-rings from the world’s largest o-ring inventory network, including:

Silicone Rubber O-Rings Material Compound Comparison:

Hundreds more specialty compounds available. Contact a Marco Sales Consultant or Engineer for more information.

Service Temperature Range:

The temperature ranges presented above are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.

Common Names:

Silicone, VMQ, PVMQ

Silicone Rubber Trade Names:

Silastic®, Elastosil®, Thermoflex®

Silicone Rubber O-Rings Features:

The term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient.

Silicone Rubber O-Rings Limitations:

Back to the O-Ring Page

New Customer Hotline: 800-775-6525

Existing Customer Specialist: 800-775-6525 or repeat customers

Marco Rubber & Plastics
PO Box 1150
Seabrook, NH 03874

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