Silicone elastomers used for seals and gaskets are incompatible with which type of refrigerants?

• A. CFC's
• B. HCFC's
• C. HFO's
• D. Ammonia

Answer: (C)

Silicone elastomers are typically not compatible with HFOs, which stands for hydrofluoroolefins. HFOs have a different chemical structure compared to other refrigerant types, and this structural difference can lead to degradation or failure of silicone seals and gaskets. The unsaturated molecular structure of HFOs can interact negatively with the silicone material, leading to issues like swelling, loss of mechanical properties, or leakage in systems that use HFOs as a refrigerant.

In contrast, silicone elastomers are generally compatible with CFCs, HCFCs, and even ammonia, although care should be taken with ammonia due to its chemical nature. Understanding the compatibility of materials in refrigerant systems is crucial to ensure reliable operation and to avoid potential leaks or failures.