Silicone O-Rings & Silicone Compound Properties

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.

XLONG SEAL 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

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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