Silicone O-Rings Selection Guide - Order Online

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.

Choose Marco Rubber & Plastics for your Silicone O-Rings

For more than 40 years, Marco Rubber & Plastics has been offering custom and standard o-rings and other sealing solutions for multiple industries. With millions of products produced and shipped annually, we are the experts your organization needs to seal the success of your application. Explore standard size o-ring sizes below.
Specialty Resistances
  • Dry Heat
  • Wide Temperature Range
  • Sunlight, Ozone,  Weathering
  • Odorless and Non-Toxic
  • Not resistant to Ketones (MEK)
  • Not resistant to Acids
  • Not resistant to Silicone Oils
  • Not resistant to Brake Fluids
Mechanical Properties
  • Poor Wear Resistance
  • Excellent Comp. Set Resistance
  • Poor Short-Term Resilience
  • Excellent Permeation Resistance

Silicone O-Ring Compatibility and Order Silicone O-Rings Online In Stock for High Temperature Static Use

Marco CPD# Datasheet Color Duro (Shore A) Relative Price Typical Inventory Level High Temp (F) Low Temp (F) Features
S1000 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) Get QuoteBuy Online
S1004 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 Get QuoteBuy Online
S1015 Orange 70 O-ring Price Comparison 4 Low 500 -65 Higher temperature resistant Silicone Get QuoteBuy Online
S1043 Orange 50 $$$$ Low 400 -103 Lower temperature resistant Silicone Get QuoteBuy Online
S1020 Clear 70 $$$$ Low 400 -65 Clear-Translucent and FDA compliant Silicone per 21 CFR 177.2600 Get QuoteBuy Online
S1146 White 70 O-ring Price Comparison 4 Low 480 -75 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured Get QuoteBuy Online
S1083 Clear 70 O-ring Price Comparison 4 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured Get QuoteBuy Online
S1037 Clear 70 O-ring Price Comparison 5 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Clean Room Manufactured Get QuoteBuy Online
S1081 Orange 65 $$$$ Low 350 -65 EMI RFI Shielding Nickel Coated Graphite filled Silicone, Volume Resistivity 0.10 ohm-cm Get QuoteBuy Online

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:

  • High temperature silicone gaskets and o-rings
  • FDA food grade silicone seals and o-rings
  • USP Class VI medical-grade silicone gaskets and o-rings

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.

  • Can be compounded to meet FDA, USP Class VI, USDA, 3-A and Canada AG
  • Excellent heat and compression resistance, excellent flexibility, good electrical insulator
  • Excellent resistance to oxygen, ozone and sunlight, animal and vegetable oil and grease
  • Resistance to fungal and biological attack

Silicone Rubber O-Rings Limitations:

  • Not recommended for dynamic application since it has low strength and poor abrasion resistance & high gas permeability
  • Concentrated solvents, oils, concentrated acids, diluted sodium hydroxide, hydrocarbon based fuels, aromatic mineral oil
  • Aromatic Hydrocarbons (benzene, toluene), aromatic mineral oil, acids and alkalis, Superheated water or steam over 250 F

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