Silicone's polymer structure (Polysiloxane, based on silicon and oxygen) provides its superior thermal properties. However, this same structure leads to a few critical limitations. Unlike Nitrile or Viton, standard Silicone seals exhibit poor mechanical strength (low abrasion and tear resistance) and generally have poor resistance to petroleum-based oils, fuels, and highly aromatic solvents. When exposed to these media, Silicone seals are prone to swelling and softening, which leads to rapid sealing failure.

Therefore, while they excel in high-temperature, static seals (like oven gaskets or engine seals exposed primarily to air and minor oil splash), they are generally avoided for dynamic seals in direct, constant contact with engine oil, hydraulic fluid, or gasoline. This material is typically selected when the primary requirement is extreme temperature tolerance or specific industry compliance (e.g., FDA-compliant materials) rather than broad-spectrum chemical and oil resistance.
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