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.

Recommended Use Not Recommended For Mechanical Properties
Dry Heat
Wide Temperature Range
Sunlight, Ozone,  Weathering
Odorless and Non-Toxic
Ketones (MEK)
Silicone Oils
Brake Fluids
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)
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
S1015 Orange 70 O-ring Price Comparison 4 Low 500 -65 Higher temperature resistant Silicone
S1043 Orange 50 $$$$ Low 400 -103 Lower temperature resistant Silicone
S1020 Clear 70 $$$$ Low 400 -65 Clear-Translucent and FDA compliant Silicone per 21 CFR 177.2600
S1146 White 70 O-ring Price Comparison 4 Low 480 -75 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
S1083 Clear 70 O-ring Price Comparison 4 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
S1037 Clear 70 O-ring Price Comparison 5 Low 400 -65 Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Clean Room Manufactured
S1081 Orange 65 $$$$ 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:

  • 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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